Relevant bibliographies by topics / Perovskite titanate

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Academic literature on the topic 'Perovskite titanate'

Author: Grafiati
Published: 4 June 2021
Last updated: 7 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Perovskite titanate.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Perovskite titanate"

1

Akaogi, Tajima, Okano, and Kojitani. "High-Pressure and High-Temperature Phase Transitions in Fe2TiO4 and Mg2TiO4 with Implications for Titanomagnetite Inclusions in Superdeep Diamonds." Minerals 9, no. 10 (October 6, 2019): 614. http://dx.doi.org/10.3390/min9100614.

Full text
Abstract:
Phase transitions of Mg2TiO4 and Fe2TiO4 were examined up to 28 GPa and 1600 °C using a multianvil apparatus. The quenched samples were examined by powder X-ray diffraction. With increasing pressure at high temperature, spinel-type Mg2TiO4 decomposes into MgO and ilmenite-type MgTiO3 which further transforms to perovskite-type MgTiO3. At 21 GPa, the assemblage of MgTiO3 perovskite + MgO changes to 2MgO + TiO2 with baddeleyite (or orthorhombic I)-type structure. Fe2TiO4 undergoes transitions similar to Mg2TiO4 with pressure: spinel-type Fe2TiO4 dissociates into FeO and ilmenite-type FeTiO3 which transforms to perovskite-type FeTiO3. Both of MgTiO3 and FeTiO3 perovskites change to LiNbO3-type phases on release of pressure. In Fe2TiO4, however, perovskite-type FeTiO3 and FeO combine into calcium titanate-type Fe2TiO4 at 15 GPa. The formation of calcium titanate-type Fe2TiO4 at high pressure may be explained by effects of crystal field stabilization and high spin–low spin transition in Fe2+ in the octahedral sites of calcium titanate-type Fe2TiO4. It is inferred from the determined phase relations that some of Fe2TiO4-rich titanomagnetite inclusions in diamonds recently found in São Luiz, Juina, Brazil, may be originally calcium titanate-type Fe2TiO4 at pressure above 15 GPa in the transition zone or lower mantle and transformed to spinel-type in the upper mantle conditions.
APA, Harvard, Vancouver, ISO, and other styles
2

Bercmans, L. John, T. Sornakumar, A. Harish Kumar, G. Siva, and G. Venkatesh. "Synthesis and Characterization of Calcium Titanate and Calcium Zirconate Compound Powders by Molten Salt Method." Nano Hybrids and Composites 17 (August 2017): 88–95. http://dx.doi.org/10.4028/www.scientific.net/nhc.17.88.

Full text
Abstract:
Alkaline earth titanates and zirconates and their binary systems are of interest for their temperature in sensitive dielectric properties. Calcium titanate and calcium zirconate perovskite ceramics find applications in pulse discharge, energy storage and microwave capacitors. These dielectric materials have been used in electric hybrid and fuel cell vehicles. In the present work, fine crystalline compound powders of calcium titanate and calcium zirconate were prepared by a single step molten salt synthesis. Calcium oxide and titanium dioxide/zirconium oxide were used as precursors to obtain the calcium titanate and calcium zirconate compound powders respectively. The prepared calcium titanate and calcium zirconate compound powders were characterized by TGA, FTIR, XRD, SEM and EDS analysis.
APA, Harvard, Vancouver, ISO, and other styles
3

Gazda, M., P. Jasinski, B. Kusz, B. Bochentyn, K. Gdula-Kasica, T. Lendze, W. Lewandowska-Iwaniak, A. Mielewczyk-Gryn, and S. Molin. "Perovskites in Solid Oxide Fuel Cells." Solid State Phenomena 183 (December 2011): 65–70. http://dx.doi.org/10.4028/www.scientific.net/ssp.183.65.

Full text
Abstract:
Perovskite oxides comprise large families among the structures of oxide compounds, and several perovskite-related structures are also known. Because of their diversity in chemical composition, properties and high chemical stability, perovskite oxides are widely used for preparing solid oxide fuel cell (SOFC) components. In this work a few examples of perovskite cathode and anode materials and their necessary modifications were shortly reviewed. In particular, nickel-substituted lanthanum ferrite and iron-substituted strontium titanate as cathode materials as well as niobium-doped strontium titanate, as anode material, are described. Electrodes based on the modified perovskite oxides are very promising SOFC components.
APA, Harvard, Vancouver, ISO, and other styles
4

Lazarevic, Z. Z., J. Bobic, N. Z. Romcevic, N. Paunovic, and B. D. Stojanovic. "Study of barium bismuth titanate prepared by mechanochemical synthesis." Science of Sintering 41, no. 3 (2009): 329–35. http://dx.doi.org/10.2298/sos0903329l.

Full text
Abstract:
Barium-bismuth titanate, BaBi4Ti4O15 (BBT), a member of Aurivillius bismuth-based layer-structure perovskites, was prepared from stoichiometric amounts of barium titanate and bismuth titanate obtained via mechanochemical synthesis. Mechanochemical synthesis was performed in air atmosphere in a planetary ball mill. The reaction mechanism of BaBi4Ti4O15 and the preparation and characteristics of BBT ceramic powders were studied using XRD, Raman spectroscopy, particle analysis and SEM. The Bi-layered perovskite structure of BaBi4Ti4O15 ceramic forms at 1100 ?C for 4 h without a pre-calcination step. The microstructure of BaBi4Ti4O15 exhibits plate-like grains typical for the Bi-layered structured material and spherical and polygonal grains. The Ba2+ addition leads to changes in the microstructure development, particularly in the change of the average grain size.
APA, Harvard, Vancouver, ISO, and other styles
5

Yao, Wei Feng, Xiao Hong Xu, Hong Wang, Jing Tao Zhou, Xue Na Yang, Yin Zhang, Shu Xia Shang, and Bai Biao Huang. "Photocatalytic property of perovskite bismuth titanate." Applied Catalysis B: Environmental 52, no. 2 (September 2004): 109–16. http://dx.doi.org/10.1016/j.apcatb.2004.04.002.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Gatea, Hamed A., and Iqbal Nahi. ""Synthesis and characterization of Ba0.8Sr0.2TiO3 perovskite thin films prepared by Sol Gel Technique "." Muthanna Journal of Pure Science 7, no. 2 (October 14, 2020): 1–11. http://dx.doi.org/10.52113/2/07.02.2020/1-11.

Full text
Abstract:
"Barium strontium Titanate (BST) is a solid solution consist of BaTiO3 and SrTiO3 that mixed with suitable ratio. Barium strontium Titanate oxide (Ba0.8Sr0.2TiO3) thin films prepared by sol gel technique. Barium strontium Titanate thin films deposited on Si substrate and annealed at [400,500, 600 and 700] ºC. The characterization of BST films investigated by a different technique, the X-Ray Diffraction (XRD) and Scanning Electron Macroscopy (SEM) revealed the phases, crystal structure and surface topography of the films. XRD pattern shows tetragonal phase for Ba0.8Sr0.2TiO3 perovskite structure with many peaks for different plans. The films annealed at the different temperature that indicated intermediate phases on perovskite structure of Ba0.8Sr0.2TiO3.
APA, Harvard, Vancouver, ISO, and other styles
7

Nakashima, Kouichi, Shogo Iwatsuki, Ichiro Fujii, and Satoshi Wada. "Preparation of Barium Titanate/Strontium Titanate Accumulation Ceramics with Necking Structure of Strontium Titanate Nanocubes." Key Engineering Materials 582 (September 2013): 67–70. http://dx.doi.org/10.4028/www.scientific.net/kem.582.67.

Full text
Abstract:
Barium titanate (BaTiO3) / Strontium titanate (SrTiO3) accumulation ceramics with necking structure of SrTiO3 nanocubes were prepared using a solvothermal method. XRD measurements confirmed SrTiO3 and BaTiO3 with a perovskite structure. The XRD peak intensities of the BaTiO3 increased significantly as the solvothermal reaction was repeated. After heat treatment of the SrTiO3 at 900°C, the particles grew larger and formed necked contacts with each other. As the solvothermal reaction was repeated in order to coat with BaTiO3, the density increased, the porosity decreased, and the thickness of the BaTiO3 layer increased.
APA, Harvard, Vancouver, ISO, and other styles
8

Cherepov, V. V., A. N. Kropachev, and O. N. Budin. "PROSPECTS FOR THE DEVELOPMENT OF METHODS FOR SYNTHESIZING PEROVSKITE STRUCTURE TITANATES AND DOPING THEM WITH RARE-EARTH ELEMENTS." Izvestiya Vuzov Tsvetnaya Metallurgiya (Proceedings of Higher Schools Nonferrous Metallurgy, no. 6 (December 14, 2018): 31–41. http://dx.doi.org/10.17073/0021-3438-2018-6-31-41.

Full text
Abstract:
The paper presents an overview of methods for obtaining perovskite structure titanates and doping them with rare-earth elements. The results of scientific research conducted by authors from different countries related to the study of the effect of doping perovskite structure titanates with rare-earth elements on their electromagnetic properties are discussed. The paper also comprises information on the use of perovskite structure titanates in various industries. As exemplified by barium titanate (BaTiO3), a comparative analysis of some morphological properties (particle size, structure) and electromagnetic characteristics (dielectric constant, Curie temperature, modulus of longitudinal oscillations (d33)) of powders obtained (and doped) by different methods is carried out. Techniques for various BaTiO3 preparation methods such as solvothermic, hydrothermal, sol-gel, chemical deposition, and solid-phase sintering are described. The paper provides the results of studies on the effect of changes in process parameters (temperature, pH, composition of the initial mixture of materials and concentration of reagents) on the phase, morphology and BaTiO3particle formation rate in hydrothermal synthesis (using BaCl2, TiCl4and NaOH as initial materials). In addition, experiments were conducted to study the effect of microwave radiation power in ВаСОз and ТЮ2 solid-phase sintering on the dielectric and ferroelectric properties of ВаТЮз ceramics. The analysis of methods for obtaining BaTiO3 and doping it with rare-earth elements found that at present the hydrothermal method and the method of solid-phase sintering (including with microwave radiation) can be regarded as advanced technologies for obtaining perovskite structure materials with predetermined properties.
APA, Harvard, Vancouver, ISO, and other styles
9

Grewe, Tobias, Ting Yang, Harun Tüysüz, and Candace K. Chan. "Hyperbranched potassium lanthanum titanate perovskite photocatalysts for hydrogen generation." Journal of Materials Chemistry A 4, no. 8 (2016): 2837–41. http://dx.doi.org/10.1039/c5ta07424j.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

ITOH, Jun-ichi, Isamu YASHIMA, Naoki OHASHI, Isao SAKAGUCHI, Hajime HANEDA, and Junzo TANAKA. "Ni Ion Diffusion in Barium Titanate Perovskite." Journal of the Ceramic Society of Japan 109, no. 1275 (2001): 955–59. http://dx.doi.org/10.2109/jcersj.109.1275_955.

Full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Perovskite titanate"

1

Duan, Runrun. "High Curie Temperature Bismuth- and Indium- Substituted Lead Titanate." Thesis, Available online, Georgia Institute of Technology, 2004:, 2004. http://etd.gatech.edu/theses/available/etd-06082004-124159/unrestricted/Duan%5FRunrun%5F200407%5Fmast.pdf.

Full text
Abstract:
Thesis (M.S.)--School of Materials Science and Engineering, Georgia Institute of Technology, 2005. Directed by Robert Snyder.
Shrout, Thomas, Committee Member ; Snyder, Robert, Committee Member ; Speyer, Robert, Committee Chair. Includes bibliographical references.
APA, Harvard, Vancouver, ISO, and other styles
2

Khan, Ashraf Reza. "Preparation and characterization of lead lanthanum titanate thin films by metalorganic decomposition." Thesis, Virginia Tech, 1994. http://hdl.handle.net/10919/42122.

Full text
Abstract:

There is a critical need for materials with very high dielectric constant to be integrated in the next generation of 64- and 256-Mb ULSI DRAMs. Materials in the Pb-based perovskite family have high relative permittivities and have consequently attracted a world wide attention. Cubic Lead Lanthanum Titanate (PLT) is one of the prime candidates in this respect and its structure and properties in the thin film form were investigated in the present study, for potential application in the ULSI DRAMs.

Thin films of Lead Lanthanum Titanate corresponding to 28 atomic percentage of lanthanum were prepared by metalorganic decomposition (MOD) process. Solutions were prepared from lead acetate, lanthanum acetate and titanium iso-propoxide and thin films were then spin-coated from these solutions on PtlTilSi02/Si and sapphire substrates. The films were fabricated from two solutions of different compositions. The composition of the first solution was determined assuming that the incorporation of La3+ in the PbTi03 structure gives rise to A-site or Pb vacancies whereas for the composition of the other solution the creation of B-site or Ti vacancies was assumed. The effect of excess lead on the structure and the properties was also studied for 0% to 20% of excess PbO. The x-ray diffraction patterns of all films at room temperature indicated a cubic structure with lattice constant of 3.92 A. Optical and electrical measurements showed that the films made assuming B-site vacancies had better properties. In general, excess PbO was found to improve the optical as well as the electrical properties of films. However, in films with Bsite vacancies this improvement occurred only up to 5-10% of excess PbO, while higher PbO additions had a deleterious effect. The films had high resistivity, good relative permittivity, low loss, very low leakage current density, and high charge storage density. A type-B film with 10 % excess Pb had a permittivity of 1336 at 100 kHz. It also had a charge storage density at room temperature of around 16.1 μC/cm2 at a field of 200 kV/cm and no sign of polarization loss or breakdown was observed up to 1010 cycles under the accelerated degradation breakdown test.


Master of Science
APA, Harvard, Vancouver, ISO, and other styles
3

Jeddy, Shehnaz. "Thermal stability of defects in strontium titante [i.e., titanate] susbtrates for multiferroic materials." Birmingham, Ala. : University of Alabama at Birmingham, 2008. https://www.mhsl.uab.edu/dt/2008m/jeddy.pdf.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Sun, Jingyu. "Carbon nanotube growth on perovskite substrates." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:2b77fe9b-7313-49b2-b490-70574b4af565.

Full text
Abstract:
This thesis reports on the chemical vapour deposition (CVD) growth of carbon nanostructures (mainly carbon nanotubes (CNTs)) on perovskite oxide surfaces with the aid of various catalysts. Two types of perovskite oxide, single crystal SrTiO3 (001) and polycrystalline BaSrTiO3, have been used as catalyst supports (in metal-catalyst-involved CVD routes) or as catalysts (via metal-catalyst-free CVD routes) for the growth of carbon nanostructures. In metal-catalyst-involved cases, SrTiO3 (001) single crystal has been proven, for the first time, to serve as a substrate for the growth of CNTs. Fe and Ni catalysts can be tailored in a controllable manner on SrTiO3 (001) surfaces prior to the CNT synthesis, forming truncated pyramid shaped nanocrystals with uniform size distributions. The growth of vertically aligned CNT carpets was realised with the aid of Fe on SrTiO3 (001) surfaces, and it was further found that the CNTs grow via a base growth model. Furthermore, it is possible to grow helical carbon nanostructures on BaSrTiO3 substrates by introducing a Sn catalyst into the system. The synthesised helical carbon nanostructures follow a tip growth mode, where the structural and chemical aspects of catalyst particles gave rise to a wide range of carbon morphologies. CNTs were also grown on single crystal SrTiO3 (001) and polycrystalline BaSrTiO3 substrates via metal-catalyst-free routes. The surface-roughness-tailored growth of CNTs was surprisingly achieved on a series of engineered SrTiO3 (001) surfaces, where a correlation between the surface roughness/morphology of the substrates and the relevant catalytic activity was revealed. The growth of CNTs arises because the catalyst fabrication methods lead to the formation of SrTiO3 asperities with nanoscale curvatures, over which the CNTs are generated throughout a lift-off process. Facet-selective growth of CNTs was observed on polycrystalline BaSrTiO3 surfaces, where BaSrTiO3 (110) facets lead to the growth of CNTs on them, whereas the (001) facets result in no growth at all. This observation was further analysed in the content of the adsorption and diffusion of carbon species on distinct BaSrTiO3 facets, before reaching the conclusion that the formation of CNTs occurs through a metal-free, stack-up process driven by the assembly of the carbon fragments.
APA, Harvard, Vancouver, ISO, and other styles
5

Zhang, Qingteng. "Properties of Ferroelectric Perovskite Structures under Non-equilibrium Conditions." Scholar Commons, 2012. http://scholarcommons.usf.edu/etd/4422.

Full text
Abstract:
Ferroelectric materials have received lots of attention thanks to their intriguing properties such as the piezoelectric and pyroelectric effects, as well as the large dielectric constants and the spontaneous polarization which can potentially be used for information storage. In particular, perovskite crystal has a very simple unit cell structure yet a very rich phase transition diagram, which makes it one of the most intensively studied ferroelectric materials. In this dissertation, we use effective Hamiltonian, a first-principles-based computational technique to study the finite-temperature properties of ferroelectric perovskites. We studied temperature-graded (BaxSr1-x )TiO3 (BST) bulk alloys as well as the dynamics of nanodomain walls (nanowalls) in Pb(ZrxTi1-x )O3 (PZT) ultra-thin films under the driving force of an AC field. Our computations suggest that, for the temperature-graded BST, the polarization responds to the temperature gradient (TG), with the "up" and "down" offset observed in polarization components along the direction of TG, in agreement with the findings from experiments. For the nanowalls in PZT, the dynamics can be described by the damped-harmonic-oscillator model, and we observed a size-driven transition from resonance to relaxational dynamics at a critical thickness of 7.2 nm. The transition originates from the change in the effective mass of a nanowall as a film thickness increases. Some of the findings may find potential applications in various devices, such as thermal sensors, energy converters, or novel memory units.
APA, Harvard, Vancouver, ISO, and other styles
6

AZEVEDO, Sérgio Alves de. "Óxidos cerâmicos a base de SrTiO3 e substituídos com Ferro/Prata – Caracterização Estrutural." Universidade Federal do Maranhão, 2015. http://tedebc.ufma.br:8080/jspui/handle/tede/1805.

Full text
Abstract:
Submitted by Rosivalda Pereira (mrs.pereira@ufma.br) on 2017-08-10T15:19:49Z No. of bitstreams: 1 SergioAzevedo.pdf: 3063334 bytes, checksum: ac4355642257682013f550aad3b1a89a (MD5)
Made available in DSpace on 2017-08-10T15:19:49Z (GMT). No. of bitstreams: 1 SergioAzevedo.pdf: 3063334 bytes, checksum: ac4355642257682013f550aad3b1a89a (MD5) Previous issue date: 2015-07-09
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Strontium titanate, SrTiO3 (ST) is a mixed oxide from the group of perovskites, has a cubic structure and a band gap of 3.2 eV. In this study systems SrTiO3(ST), SrTi0,90Fe0,10O3(STF), Sr0,90Ag0,10TiO3(SAT) and Sr0,95Ag0,05Ti0,90Fe0,10O3(SATF) were synthesized by the Pechini method in which the same, favor the production of nanostructured materials with a high stoichiometric accordingly. The precursors used were titanium isopropoxide, citric acid, strontium nitrate, ferric nitrate, silver nitrate and ethylene glycol. For the formation of the precursor powder, the resin is calcined at 300 °C for 1 hour with a ramp of 10 °C min-1. The precursor powder was characterized by TG/DTA. For the formation of calcined systems we used different temperatures of 400 °C / 500 °C/ 600 °C/ 700 °C/ 2h with a ramp of 10 °C min-1. The sample composition was calcined in ST 550 °C/ 2h to examine the formation of the phase. The samples were characterized by X-Ray Diffraction (XRD) spectroscopy, FTIR, UV-Vis spectroscopy, Raman spectroscopy and B.E.T. the sample STF showed a peak shift DTA higher intensity to lower temperature, resulting in a more rapid decomposition. The x-ray diffractograms show the formation of perovskite phase at low temperature of 600 °C with secondary phase SrCO3 and TiO2, the SAT and SATF samples occurred and formation of metal pranta as a secondary phase. Infrared spectra show that the material exhibits short-range organization and having SrCO3 as a secondary phase. Raman spectra show first order band which is characteristic of tetragonal structure ST. The samples are mesoporous, the substitution Ti / Fe and Sr / Ag promoted the reduction of the surface area of the samples. The addition of iron as a substituent ST caused a reduction of the optical band gap 3.21(2) to 2.31(2) in PBS and 2.16(1) composition in SATF composition. It can be concluded that the method is efficient in the synthesis of structural organization samples with short and long range, using calcination temperatures above 600 °C, and that the substitution by Ti/Fe promotes the reduction of the band gap and the surface area of the ST.
O Titanato de estrôncio, SrTiO3 (ST) é um óxido misto do grupo das perovskitas, apresenta estrutura cúbica e um “band gap” de 3,2 eV. Neste estudo, os sistemas SrTiO3(ST), SrTi0,90Fe0,10O3(STF), Sr0,90Ag0,10TiO3(SAT) e Sr0,95Ag0,05Ti0,90Fe0,10O3(SATF) foram sintetizados pelo método Pechini, o mesmo favorece a obtenção de materiais com alta conformidade estequiométrica. Os precursores utilizados foram: isopropóxido de titânio, ácido cítrico, nitrato de estrôncio, nitrato férrico, nitrato de prata e etileno glicol. Para a formação do pó precursor, calcinou-se a resina a 300ºC por 1 hora com rampa de 10 ºC.min-1. O pó precursor foi caracterizado por TG/DTA. Para a formação dos sistemas calcinados utilizou-se diferentes temperaturas de 400 ºC/500 ºC/600 ºC/700 ºC/2h com rampa de 10 ºC.min-1. A amostra com composição ST foi calcinada em 550 ºC/2h para analisar a formação da fase. As amostras foram caracterizadas por Difração de Raios-X (DRX), Espectroscopia FTIR, Espectroscopia UV-VIS, Espectroscopia Raman e B.E.T. A amostra STF apresentou um deslocamento do pico DTA de maior intensidade, para temperatura menor, resultando em uma decomposição mais rápida. Os difratogramas de Raios-x comprovam a formação da fase perovskita a partir da temperatura de 600ºC, com fase secundaria de SrCO3 e TiO2, nas amostras SAT e SATF ocorreu e formação de pranta metálica como fase secundaria. Os espectros infravermelhos mostram que o material apresenta organização a curto alcance e que apresenta SrCO3 como fase secundária. Os espectros Raman apresentam banda de primeira ordem que é característico da fase tetragonal da estrutura ST. As amostras são mesoporosas, as substituições Ti/Fe e Sr/Ag promoveram a redução da área superficial das amostras. A adição de ferro como substituinte promoveu a redução do band gap óptico do ST de 3,21(2) para 2,31(2) na composição STF e 2,16(1) na composição SATF. Pode se concluir que o método é eficiente na síntese das amostras com organização estrutural a curto e longo alcance, utilizando temperaturas de calcinação acima de 600 ºC, e que a substituição Ti por Fe promove a redução do “band gap” e da área superficial do ST.
APA, Harvard, Vancouver, ISO, and other styles
7

Behnke, Matthew. "INVESTIGATION OF YTTRIUM TITANATE IN A LEAD IODIDE PEROVSKITE SENSITIZED SOLAR CELL TO ENHANCE EFFICIENCY." OpenSIUC, 2015. https://opensiuc.lib.siu.edu/theses/1814.

Full text
Abstract:
AN ABSTRACT OF THE THESIS OF MATTHEW BEHNKE, for the Master of Science degree in Mechanical Engineering, presented on November 3rd, 2015, at Southern Illinois University Carbondale TITLE: INVESTIGATION OF YTTRIUM TITANATE IN A LEAD IODIDE PEROVSKITE SENSITIZED SOLAR CELL TO ENHANCE EFFICIENCY MAJOR PROFESSOR: Dr. Kanchan Mondal This research is aimed to evaluate the effects of a pyrochlore to enhance the efficiency of a solid state organic inorganic halide-sensitized solar cell. The objectives of this study are to synthesize, assemble, test, and evaluate a pyrochlore that will lower the band gap of TiO2 and increase conversion efficiency in solid state organic-inorganic halide sensitized solar cells. The cells that were constructed and evaluated were made up of titanium oxide (TiO2) or yttrium titanate (Y2Ti2O7), a perovskite organic lead iodide (CH3NH3PbI3) as the polymer, a hole transport membrane (HTM) made of 1,3,5-Tris(diphenylamino) benzene, a layer of carbon black, and Indium Tin Oxide (ITO) coated glass. The cells were characterized and tested under a 658 nm wavelength light with a power density of 65 mW/cm2 , while the individual substances were examined under a scanning electron microscope and transmission electron microscopes and x-ray diffraction analyses were conducted to determine the structural make up of the individual materials. From the obtained data cell conversion efficiencies and fill factors were calculated. It was found that the Y2Ti2O7 nanofiber based cells exhibited the highest fill factor of 0.57 compared to 0.20 -0.29 obtained during the experiments with TiO2 based cells. The cell efficiencies of the Y2Ti2O7 were however low probably due to a significant portion of amorphous material in the photoactive layer of the cell.
APA, Harvard, Vancouver, ISO, and other styles
8

Sakaguchi, Tatsunori. "Synthesis and Characterization of Titanium Perovskite Oxyhydrides Prepared by Topochemical Hydride Reduction." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/215561.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Kaspar, Tiffany C. "Materials and magnetic studies of cobalt-doped anatase titanium dioxide and perovskite strontium titanate as potential dilute magnetic semiconductors /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/9902.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Lavinscky, Anderson Borges da Silva. "Síntese e caracterização do sistema SrTi1-xSnxO3 na forma de pó e na forma de filmes finos para aplicação como sensores de gases tóxicos." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/18/18158/tde-15022019-085246/.

Full text
Abstract:
O objetivo desta tese de doutorado foi estudar a influência da adição do íon estanho (Sn4+) à rede do composto SrTiO3 em substituição ao íon de titânio visando otimizar as propriedades elétricas desse composto e, como consequência, obter uma melhora de seu desempenho como um sensor de gás na forma de filmes finos. Para realizar a deposição destes filmes finos através dos métodos de Deposição por Feixe de Elétrons (EBD), alvos cerâmicos de composição SrTi1-xSnxO3 (STSO) com x = 0; 0,20; 0,40; 0,60; 0,80; 0,85; 0,90; 0,95; 1 foram obtidos através do método dos precursores poliméricos modificado. A sequência de formação de soluções sólidas foi determinada através do refinamento Rietveld das amostras STSO na forma de pó sinterizadas, obtidas através dos métodos dos precursores poliméricos e de reação de estado sólido, mostrando que a transição da fase cúbica Pm3̄m do composto SrTiO3 até a fase ortorrômbica Pnma do composto SrSnO3 não depende do método de síntese. As medidas de espectroscopia Raman e absorção de raios-X (XANES, na borda K do Ti) das amostras tanto na forma de pó, obtidas através do método dos precursores poliméricos e de reação de estado sólido, quanto na forma de filme fino obtidas por EBD revelaram a existência de uma desordem local na rede do composto SrTiO3 que diminui com o aumento da temperatura e com a diminuição da concentração de Sn. Os filmes finos STSO obtidos por EBD foram avaliados como sensores utilizando-se os gases O3 e NH3. Em medidas realizadas com o gás ozônio (O3), os resultados mostraram que os filmes finos de 100 nm de espessura apresentaram uma maior sensibilidade tendo a amostra com 60% de Sn com o melhor desempenho a 350°C para 0,15 ppm do gás. As análises de performance dos filmes STSO quanto a seletividade indicaram que não foram seletivos e que apresentaram uma maior resposta ao gás ozônio quando comparados ao gás NH3.
The objective of this work was to study the influence of the addition of tin ion (Sn4+) into the SrTiO3 compound lattice, to replace the titanium ion (Ti4+). The aim was to optimize the electrical properties of SrTiO3 compound and, as a consequence, to obtain an improvement of its performance as a gas sensor in the thin films samples. To perform the deposition of these thin films through Electron Beam Deposition (EBD), ceramic targets of composition SrTi1-xSnxO3 (STSO) with x = 0; 0.20; 0.40; 0.60; 0.80; 0.85; 0.90; 0.95; and 1 were obtained by the modified polymer precursor method. The solid solution formation sequence was determined by the Rietveld refinement of the STSO sintered powdered samples, obtained by both polymeric precursor and solid-state reaction methods, showing that the transition from the cubic Pm3̄m phase of the SrTiO3 compound to the orthorhombic Pnma phase of the SrSnO3 compound does not depend on the synthesis method. The measurements of Raman spectroscopy and absorption of X-rays (XANES, at Ti K-edge), of the powdered samples obtained by both synthesis methods and of the thin films obtained by EBD, revealed the existence of a local disorder in the SrTiO3 compound lattice which decreases with increasing of temperature and with decreasing of Sn concentration. The STSO thin films were evaluated as sensors using the O3 and NH3 gases. In measurements accomplished with the ozone gas (O3), the results showed that thin films of 100 nm thickness had a higher sensitivity. The sample having 60% of tin showed the best performance at 350°C for 0.15 ppm of ozone gas. The performance analysis related to the selectivity of the STSO films indicated they were not selective and that presented a higher response to the ozone gas when compared to the NH3 gas.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Perovskite titanate"

1

Windsch, W., R. Heidler, G. Klotzsche, and B. Milsch. "EPR Investigations of the Dynamics of Doping IONS in Perovskite Lead Titanate Ceramics." In 25th Congress Ampere on Magnetic Resonance and Related Phenomena, 53–54. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-76072-3_25.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Kotomin, E. A., E. Heifets, W. A. Goddard, P. W. M. Jacobs, and G. Borstel. "Theoretical Simulations of Surface Relaxation for Perovskite Titanates." In Defects and Surface-Induced Effects in Advanced Perovskites, 209–20. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4030-0_21.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Tokura, Y., and T. Katsufuji. "Optical Spectroscopy on the Mott Transition in Perovskite-Type Titanates." In Spectroscopy of Mott Insulators and Correlated Metals, 163–73. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-57834-2_14.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Weber, W. J., W. Jiang, S. Thevuthasan, R. E. Williford, A. Meldrum, and L. A. Boatner. "Ion-Beam-Induced Defects and Defects Interactions in Perovskite-Structure Titanates." In Defects and Surface-Induced Effects in Advanced Perovskites, 317–28. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-011-4030-0_32.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Klee, M., U. Mackens, J. Pankert, W. Brand, and W. Klee. "Deposition of Undoped and Doped Pb (Mg,Nb)O3 — PbTiO3, PbZrxTi1-xO3, Alkaline Earth Titanate and Layered Perovskite Thin Films on Pt and Conductive Oxide Electrodes by Spin-On Processing: Correlation of Growth and Electrical Properties." In Science and Technology of Electroceramic Thin Films, 99–115. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-017-2950-5_7.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Belda, Charif, Egle Dietzen, Mihails Kusnezoff, Nikolai Trofimenko, Uladimir Vashook, Alexander Michaelis, and Ulrich Guth. "Interaction of perovskite type lanthanum-calcium-chromites-titanates La1−xCaxCr1−yTiyO3−δwith solid electrolyte materials." In Advances in Solid Oxide Fuel Cells X, 41–53. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119040637.ch5.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Neagu, D., and J. T. S. Irvine. "Perovskite Defect Chemistry as Exemplified by Strontium Titanate." In Comprehensive Inorganic Chemistry II, 397–415. Elsevier, 2013. http://dx.doi.org/10.1016/b978-0-08-097774-4.00421-6.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Ondrejkovic, P., P. Marton, V. Stepkova, and J. Hlinka. "Fundamental Properties of Ferroelectric Domain Walls from Ginzburg–Landau Models." In Domain Walls, 76–108. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198862499.003.0004.

Full text
Abstract:
This chapter discusses the contemporary possibilities, prospects, and limitations of phase-field simulations and Ginzburg-Landau-Devonshire models of DWs. It focuses on the most studied ferroelectric oxides BaTiO3, KNbO3, PbTiO3, as well as in various complex perovskite oxides like lead zirconate titanate (PZT) and lead-based relaxor ferroelectrics. In the past decade, there have been multiple important results published in the field of perovskite ferroelectrics with a support of phase-field simulations. Certain predictions, like existence of Bloch walls in BaTiO3 or vortex structures in PbTiO3-SrTiO3 superlattices have been verified by atomistic or ab-initio calculations. The chapter resumes their available model potentials and the key predictions reported in the last decade. It is complemented by original data allowing comparisons and an outlook.
APA, Harvard, Vancouver, ISO, and other styles
9

Tkach, Alexander, and Paula M. Vilarinho. "Nonstoichiometry Role on the Properties of Quantum-Paraelectric Ceramics." In Structure Processing Properties Relationships in Stoichiometric and Nonstoichiometric Oxides. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.89499.

Full text
Abstract:
Among the lead-free perovskite-structure materials, strontium titanate (SrTiO3—ST) and potassium tantalate (KTaO3—KT), pure or modified, are of particular importance. They are both quantum paraelectrics with high dielectric permittivity and low losses that can find application in tunable microwave devices due to a dependence of the permittivity on the electric field. Factors as Sr/Ti and K/Ta ratio in ST and KT ceramics, respectively, can alter the defect chemistry of these materials and affect the microstructure. Therefore, if properly understood, cation stoichiometry variation may be intentionally used to tailor the electrical response of electroceramics. The scientific and technological importance of the stoichiometry variation in ST and KT ceramics is reviewed and compared in this chapter. The differences in crystallographic phase assemblage, grain size, and dielectric properties are described in detail. Although sharing crystal chemical similarities, the effect of the stoichiometry is markedly different. Even if the variation of Sr/Ti and K/Ta ratios did not change the quantum-paraelectric nature of ST and KT, Sr excess impedes the grain growth and decreases the dielectric permittivity in ST ceramics, while K excess promotes the grain growth and increases the dielectric permittivity in KT ceramics.
APA, Harvard, Vancouver, ISO, and other styles
10

"ELNES of titanate perovskites – a probe of structure and bonding." In Electron Microscopy and Analysis 2003, 133–36. CRC Press, 2004. http://dx.doi.org/10.1201/9781482269130-31.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Perovskite titanate"

1

Singh, Rajan Kumar, Sagar Sanodia, Neha Jain, and Ranveer Kumar. "Effect of mechanical milling on barium titanate (BaTiO3) perovskite." In 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5033161.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Íñiguez, Jorge. "Local mode transferability from cubic perovskite to hexagonal barium titanate." In Fundamental physics of ferroelectrics 2000. AIP, 2000. http://dx.doi.org/10.1063/1.1324443.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Vlassov, Anatoly S., Felix A. Akopov, Evgeny S. Lukin, Vladimir N. Mineev, and Oleg M. Traktuev. "Sacrificial Layer Composition Optimization for Immobilization of Radioactive Waste in Nuclear Reactor External Catcher." In ASME 2001 8th International Conference on Radioactive Waste Management and Environmental Remediation. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/icem2001-1326.

Full text
Abstract:
Abstract Results of the analysis of influence sacrificial layer (SL) composition on the base of titanate ceramics on the processes in external core catcher are submitted. It was being supposed that SL not only have to mitigate action of corium on refractory layer but then immobilize high level radioactive wastes (HLW). Titanate ceramics was selected as a SL material for this purpose. This ceramics is formed during interaction zirconium and zirconia from corium with refractory concrete of SL on the base of calcium aluminate and barium aluminate with filler from TiO2. The composition of indurated melt represents such well-known compounds as rutile TiO2, perovskite CaTiO3, zirconolite CaZrTi2O7 and phase hollandite type BaTi6Al2O16 which produce Synroc. Minimization quantity material SL for their total deployment in under reactor space was made leaded. For immobilization of uranium there may be used zirconia from corium (55,5 t) and SL (21,5 t) and zirconolite as uranium yields a continuous range of solid solutions with these substances. Crystallization processes of the model compositions without uranium oxide were studied. It was determined that perovskite, zirconolite, hollandite and after that crystallization eutectic systems were formed depending on melt crystallization velocity.
APA, Harvard, Vancouver, ISO, and other styles
4

Shieh, Jay, Szu-Wei Chen, and Chia-Yu Fang. "Photocurrent Response of Composite Perovskite Oxide Thin Films With Specific Semiconducting and Ferroelectric Properties." In ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3058.

Full text
Abstract:
The goal of this study is to investigate photocatalytic semiconductor systems which are layered thin film composites built from perovskite oxide materials with characteristics such as small and large band gaps and/or ferroelectricity. In order to improve the efficiency of photocatalysis, semiconductor heterojunctions within the developed composites have been designed to possess electronic band offsets favoring the separation of photo-induced electron and hole (e−/h+) pairs. Furthermore, the remanent polarization of the ferroelectric component within the composites has been utilized to induce favorable band bending at the material interface, lowering the potential barrier for electron transfer. The band offsets and ferroelectric polarization could be considered as built-in electric fields; how they interact with photo-induced e−/h+ would greatly affect the photocatalytic properties of the composites. In this study, various perovskite oxide thin film materials — large band gap strontium titanate (SrTiO3), small band gap silver niobate (AgNbO3) and ferroelectric lead lanthanum titanate (PLT) — were combined to form layered thin film composites. The composites were then adopted as photoanodes in a photoelectrochemical cell and detailed characterization of their photocurrent response was carried out under different light irradiation and ferroelectric polarization conditions. Electronic band offsets at the material interface (i.e., heterojunction) were determined by ultraviolet-visible spectrophotometry and ultraviolet photoelectron spectroscopy. Electric field poling of the ferroelectric component was achieved by non-contact corona charging. Our results have shown that the band offsets at the SrTiO3-AgNbO3 heterojunction were about 1.0 eV in conduction band edge and 0.4 eV in valence band edge, promoting the rapid separation of photo-induced charge carriers; i.e., the flow of e− from SrTiO3 to AgNbO3 and the flow of h+ from AgNbO3 to SrTiO3. It was found that ferroelectric PLT could be used as a seeding layer for the low-temperature (500 °C) growth of SrTiO3/AgNbO3 thin film composites on ITO/glass substrates, forming a layered structure of SrTiO3/AgNbO3/PLT/ITO. In addition, the photocurrent density of the composites could be increased by depositing gold nanoparticles at the PLT-ITO interface. When the polarization of the PLT layer was poled toward the AgNbO3 layer, the potential barrier associated with the flow of e− to the ITO electrode was reduced by favorable band bending created at the AgNbO3-PLT interface. This resulted in a significant increase in photocurrent density.
APA, Harvard, Vancouver, ISO, and other styles
5

Shi, Yong, Shiyou Xu, and Sang-Gook Kim. "Partially Aligned Piezoelectric Nanofibers by Sol-Gel Electrospining Process." In ASME 4th Integrated Nanosystems Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/nano2005-87082.

Full text
Abstract:
This paper reports the fabrication of partially aligned Lead Zirconate Titanate (PZT) nanofibers with an average diameter of 150 nm by Sol-Gel Electrospinning process. Both randomly distributed and uniaxially aligned PZT fibers were obtained from the sol-gel PZT solution with viscosity modified by polyvinyl pyrrolidone (PVP). The diameters of the nano fibers can be further reduced or controlled for different applications. SEM, TEM and x-ray diffraction (XRD) are used to characterize the nano-fibers and their crystal structures. XRD confirmed that pure perovskite phase was formed after the as-spun fibers being annealed at about 650°C. Different approaches have been explored to fabricate the uniaxially-aligned PZT nano-fibers. Microelectromechanical (MEMS) based micro-fabrication technologies are used to assist the development of the nano-fibers in designing the test samples, depositing and patterning the electrodes, and also testing the performance of the nano fibers.
APA, Harvard, Vancouver, ISO, and other styles
6

Ctibor, P., P. Rohan, K. Neufuss, B. Kolman, J. Dubsky, and P. Chraska. "Plasma Spraying of Titanates I." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p0945.

Full text
Abstract:
Abstract Among candidate materials for plasma spraying titanates ATiO3, where A is an element from the alkaline earth group (11), were not systematically tested until today. This paper reports on plasma spraying of synthetic perovskite CaTiO3 and geikielite-perovskite system MgTiO3-CaTiO3. Perovskite CaTiO3 is well known as dielectric material and a basic component of complex dielectric ceramics. Since it is relatively chemically simple and inexpensive material it has been selected for the basic preliminary studies. Mixture of geikielite-perovskite MgTiO3-CaTiO3, with Mg:Ca ratio equal to 94:6, was chosen because its permittivity is independent of temperature. Plasma spraying was done with the water stabilized plasma gun WSP. Plasma spraying conditions were optimized using single splat observation for various substrates and varying substrate temperature. Standard experimental techniques were used for studying of microstructures, chemical and phase compositions and porosity of as-sprayed and annealed deposits. Mechanical properties such as Young’s modulus and microhardness were measured.
APA, Harvard, Vancouver, ISO, and other styles
7

Knyazev, O. A., A. G. Ptashkin, S. V. Stefanovsky, M. A. Zen’kovskaya, S. V. Yudintsev, B. S. Nikonov, and O. I. Stefanovsky. "Inductive Cold Crucible Melting and Characterization of Uranium and Thorium Bearing Murataite Ceramics." In The 11th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2007. http://dx.doi.org/10.1115/icem2007-7126.

Full text
Abstract:
Murataite-based ceramics containing 10 wt.% either UO2 or ThO2 were produced by inductive cold crucible melting (ICCM) at operating frequencies of 1.76 MHz and 5.28 MHz and examined using X-ray diffraction and scanning and transmission electron microscopy. High specific productivity was achieved. Average melting ratio was 8.3 kW×h/kg. We identified three distinct murataite polytypes in the U-bearing ceramics: a five- (5C), eight- (8C), and three-fold (3C) fluorite unit cell composing respectively the core, intermediate and rim zones of the grains. In contrast, in the Th-bearing ceramic one of the polytypes with eight-fold (8C) fluorite unit cell was found to be prevailing over two others (5C and 3C). Computer simulation of the major reflection due to the murataite phase in the Th-bearing sample also exhibits superposition of peaks due to three distinct polytypes but one of them (8C) is predominant. The core zone of the murataite in the U-bearing specimens is characterized by UO2 concentrations as high as 12.1 wt%, which successively diminishes in concentration through the intermediate zone to the rim, the latter of which contains 5.2 wt% UO2. Thorium distribution within the murataite crystals is more uniform. The other phases found in the ceramics are crichtonite, rutile and traces of perovskite, Fe/Mn titanate ilmenite/pyrophanite, zirconolite, and vitreous phase. The difference in phase composition and actinide partitioning in the ceramics is influenced by synthesis conditions. Thus, application of large-scale cold crucibles is a prospective route for the development of industrial-scale process and technology for ceramization of actinide-bearing HLW. The advantage of this method is production of zoned crystals with the highest concentrations of actinides and rare earth elements in the core, effectively isolating these elements from potential leach solutions.
APA, Harvard, Vancouver, ISO, and other styles
8

Mukherjee, Rajib, and Chad B. O'Neal. "Dynamic Modeling and Prototyping for Low-Frequency Piezoelectric MEMS Vibration Energy Scavenging: VibES." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14349.

Full text
Abstract:
The advancement in the field of wireless electronics for use in embedded systems and control system technologies is limited by the availability of efficient and portable power generation system. Harvesting ambient energy provides an excellent option to energize these low power wireless electronic applications. Low frequency vibrational energy scavenging of microelectromechanical system (MEMS) utilizing piezoelectric power generation can effectively serve this purpose. Initial fabrication has been carried out in terms of PZT film characterization, initial testing to verify the piezoelectric nature of the as coated PZT film, optimization of 125 μm thick nickel electroplating, and innovative cantilever release process based on inductively coupled plasma etching (Bosch Process) to increase the yield of working cantilever arrays on a die. An optimized process flow for the prototype fabrication was proposed and lead zirconium titanate (PZT) thin film deposition by sol-gel was characterized on three different bottom electrodes. The net effective yield in terms of working cantilevers on a die was increased to about 80% of over 500 cantilevers on a die. X-ray diffraction results revealed the perovskite phase formation of the as-coated PZT film with a [111] predominant crystal orientation. The as-coated PZT film was poled and the initial testing confirmed the piezoelectric nature of the film. The desired cantilever configuration was modeled such that its natural frequency lies approximately in the 200 Hz range while ensuring that the maximum stress generated in the structure does not exceed the yield strength of the material both in the static stage and in the dynamic stage. It was observed that positioning of the mass was a significant factor influencing the natural frequency of the structure. The analysis was performed for cantilever configurations made of silica, PZT, and nickel in which the effect of the thinner layers (electrodes) has been ignored. It was found that this configuration yields a natural frequency of 255 Hz which lies in the desired range of frequency (100-500 Hz).
APA, Harvard, Vancouver, ISO, and other styles
9

Itié, J. P., B. Couzinet, A. M. Flank, P. Lagarde, and A. Polian. "High Pressure XAS at the Ti K Edge on Titanate Perovskites." In X-RAY ABSORPTION FINE STRUCTURE - XAFS13: 13th International Conference. AIP, 2007. http://dx.doi.org/10.1063/1.2644488.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Perovskite titanate' for particular source types:
Journal articles Dissertations / Theses
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography