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Journal articles on the topic 'Perovskite titanate'

Author: Grafiati

Published: 4 June 2021

Last updated: 7 February 2022

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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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.

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"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.

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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.

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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.

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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.

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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.

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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.

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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.

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11

Lin, Ming-Hong, and Hong-Yang Lu. "Collinear partial dislocations in barium titanate perovskite." Materials Science and Engineering: A 333, no. 1-2 (August 2002): 41–44. http://dx.doi.org/10.1016/s0921-5093(01)01827-5.

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12

Hua, Chunxiu, Xiangpeng Fang, Zhaoxiang Wang, and Liquan Chen. "Lithium storage in perovskite lithium lanthanum titanate." Electrochemistry Communications 32 (July 2013): 5–8. http://dx.doi.org/10.1016/j.elecom.2013.03.038.

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13

Shen, Yang, Yu Zhong Ruan, Yan Yu, and Yun Hong Zheng. "Synthesis of Aluminium Titanate Ceramics from Waste Sludge of Aluminium Factory." Key Engineering Materials 368-372 (February 2008): 1538–40. http://dx.doi.org/10.4028/www.scientific.net/kem.368-372.1538.

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Aluminium titanate was synthesized using waste aluminium sludge and chemical pure TiO2 powder as raw materials. Effect of different compositions on crystal structure and contents of target product was discussed. XRD results showed that four crystal phases, aluminium titanate, perovskite, rutile and aluminum oxide, are formed in the sintered samples. The content of aluminium titanate increases first and then decreases with the decrease of the content of waste aluminum sludge. When the content of the sludge is 65.52wt%, the content of aluminium titanate reaches the maximum of 86.1wt%.

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14

Garth Platt, R. "Perovskite, loparite and Ba-Fe hollandite from the Schryburt Lake carbonatite complex, northwestern Ontario, Canada." Mineralogical Magazine 58, no. 390 (March 1994): 49–57. http://dx.doi.org/10.1180/minmag.1994.058.390.05.

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AbstractWithin a suite of felsic-free, mica-rich alkaline ultramafic rocks of the Schryburt Lake carbonatite complex of northwestern Ontario, loparite and Ba-Fe hollandite occur in intimate association with perovskite. The host rocks have variable modal proportions of Mg-olivine, phlogopite, magnetite, ilmenite, apatite and carbonate (generally calcite) with minor Mg-salite. Thus, they correspond to ultramafic lamprophyres (i.e. aillikites), in the sense of Rock (1990) or the lamprophyric facies of the melilitite clan, in the sense of Mitchell (1993).Perovskite is the principal titanate phase, forming both euhedral and anhedral grains, the latter showing evidence of marginal resorption. It exhibits complex zonal patterns due principally to variations in the light rare earth elements, Na and Nb. In the nomenclature suggested, they may be termed perovskite and cerian perovskite. Loparite forms as small euhedral overgrowths on corroded perovskite cores. Chemically they are essentially solid solutions of loparite, lueshite and perovskite. Consequently, they may be termed calcian-loparite, calcian niobian loparite, niobian calcian loparite, loparite and niobian loparite. Titanates of the hollandite group are rare accessory minerals whose composition closely approach that of the septatitanate BaFe2+Ti7O16.The complex zoning of the perovskite grains has been attributed to the periodic introduction of carbonatite-derived fluids enriched in REE, Na and Nb into the silicate system during perovskite crystallization. Subsequent reaction of the early perovskite with F-bearing fluids leads to a localized environment enriched in Ti, Na, Nb and REE derived from both the fluid phase and the unstable perovskite. Loparite subsequently crystallizes from these micro-chemical environments.

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15

Ma, Yuan, Zhengjie Wu, Haiwang Wang, Guanqi Wang, Yukai Zhang, Pengcheng Hu, Yuanming Li, et al. "Synthesis of nanocrystalline strontium titanate by a sol–gel assisted solid phase method and its formation mechanism and photocatalytic activity." CrystEngComm 21, no. 26 (2019): 3982–92. http://dx.doi.org/10.1039/c9ce00495e.

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16

Kondo, Masao, and Kazuaki Kurihara. "Orientation Control of Perovskite Epitaxial Thin Film on Silicon Substrate with Yttria-Stabilized Zirconia Buffer Layers." Key Engineering Materials 320 (September 2006): 69–72. http://dx.doi.org/10.4028/www.scientific.net/kem.320.69.

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The influence of a rare earth oxide/yttria-stabilized zirconia (YSZ) double buffer layer structure on the orientation of a perovskite thin film was investigated on (100) silicon substrates. A calcium titanate perovskite film with a mixture of (110) and (100) orientation was grown epitaxially on a YSZ buffer layer. Since rare earth oxides have almost the same chemical nature and different lattice parameters, it is anticipated that the lattice parameter of the buffer layer can be controlled by changing the rare earth element. An (100) oriented epitaxial calcium titanate film was obtained by changing the composition of rare earth oxides on the YSZ/Si substrate.

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17

Vijatovic, M. M., J. D. Bobic, and B. D. Stojanovic. "History and challenges of barium titanate: Part II." Science of Sintering 40, no. 3 (2008): 235–44. http://dx.doi.org/10.2298/sos0803235v.

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Barium titanate is the first ferroelectric ceramics and a good candidate for a variety of applications due to its excellent dielectric, ferroelectric and piezoelectric properties. Barium titanate is a member of a large family of compounds with the general formula ABO3 which is called perovskite. Barium titanate can be prepared using different methods. The synthesis method depends on the desired characteristics for the end application and the method used has a significant influence on the structure and properties of barium titanate materials. In this review paper, in Part II the properties of obtained materials and their application are presented.

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18

Wright, John S., and Lorraine Falter Francis. "Phase development in Si modified sol-gel-derived lead titanate." Journal of Materials Research 8, no. 7 (July 1993): 1712–20. http://dx.doi.org/10.1557/jmr.1993.1712.

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Sol-gel methods were used to prepare chemically modified lead titanate (PT) powders. A PT alkoxide solution was synthesized and doped with Si (2–12 mole%) or with equimolar amounts (2–12 mole%) of Si and Pb through the addition of Si and Pb–Si alkoxide solutions, respectively. PT alkoxide solutions were also prepared with excess Pb and Ti (7 and 10 mole%). Gels were prepared through controlled additions of water. Crystalline phase development of gel-derived powders with heat treatment (400–700 °C) was studied using x-ray diffraction (XRD) and differential thermal analysis (DTA). While PT powders without added Si crystallized directly into a perovskite phase, Si modified materials crystallized first into a pyrochlore phase and at a higher temperature transformed into perovskite. The pyrochlore lattice parameter and the temperature for the transformation to perovskite increased with Si content. In all cases, the crystal structure of the final perovskite phase was not affected by the Si addition. The effect of Si on phase development and mechanisms of transformation is discussed.

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19

Urban, Jeffrey J., Wan Soo Yun, Qian Gu, and Hongkun Park. "Synthesis of Single-Crystalline Perovskite Nanorods Composed of Barium Titanate and Strontium Titanate." Journal of the American Chemical Society 124, no. 7 (February 2002): 1186–87. http://dx.doi.org/10.1021/ja017694b.

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20

Buck, E. C., and I. P. Jones. "Radiation damage in rutile and perovskite." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (August 1990): 830–31. http://dx.doi.org/10.1017/s0424820100177283.

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The radiation damage characteristics of some of the phases of SYNROC, notably rutile and the perovskites, barium titanate and calcium titanate have been investigated. The effects of electron irradiation on a number of simple oxides, such Al2O3 , ZnO and MgO are well documented. The effects are generally more complicated than those in metals, as there are two or more charged species usually of significantly differing masses. Electron irradiated oxides generally form pure edge interstitial loops and undergo a decrease in displacement energy (Ed ) with increasing temperature. The latter effect has been ascribed to the occurrence of two separate displacements, one for the anion and one for the cation, corresponding to the minimum and maximum in the temperature versus displacement voltage curves. Optical measurements have been used to distinguish anion from cation displacements.Irradiation of rutile in the temperature range 200°C to 400°C with lMeV electrons caused the production of pure edge interstitial unfaulted dislocation loops of the type b=a<100> lying on {100}s planes (FIG. 1.).

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21

Ohtomo, A., D. A. Muller, J. L. Grazul, and H. Y. Hwang. "Artificial charge-modulationin atomic-scale perovskite titanate superlattices." Nature 419, no. 6905 (September 2002): 378–80. http://dx.doi.org/10.1038/nature00977.

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22

Ady, Jan, Arum Nurpratiwi, Aliyah, and Winda Apriliana. "The Perovskite Phase Optimize of Barium Titanate Nanoparticles." Journal of Physics: Conference Series 1445 (January 2020): 012001. http://dx.doi.org/10.1088/1742-6596/1445/1/012001.

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23

Kumar, Nishant, Alo Dutta, S. Prasad, and T. P. Sinha. "Electrical properties of complex perovskite samarium nickel titanate." Electronic Materials Letters 9, no. 5 (September 2013): 635–39. http://dx.doi.org/10.1007/s13391-013-2187-2.

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24

Yang, Jie, Li Jie Wang, Xiang Yun Deng, Jian Shao, Yang Shan Sun, and Xing Gang Hou. "The Hydrothermal Synthesis of BaTiO₃ Nanotubes Arrays with Good Electrical Property." Advanced Materials Research 873 (December 2013): 158–63. http://dx.doi.org/10.4028/www.scientific.net/amr.873.158.

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Barium titanate nanotubes arrays were synthetized by in-suit hydrothermal method using TiO2nanotubes as both template and reactant in titanium substrate. Highly ordered nanotubes arrays and the spacing between nanotubes are apparent. XRD indicates that the samples have excellent crystallization and perovskite structure. Typical ferroelectric hysteresis loop of as-formed barium titanate nanotubes arrays with remanent polarization and coercive field are 6.72 and 48.7kV/cm.

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25

Wang, Hui, Rui Jiang, Meili Sun, Xiong Yin, Yanjun Guo, Meng He, and Leyu Wang. "Titanate hollow nanospheres as electron-transport layer in mesoscopic perovskite solar cell with enhanced performance." Journal of Materials Chemistry C 7, no. 7 (2019): 1948–54. http://dx.doi.org/10.1039/c8tc06218h.

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26

Bursill, L. A., J. L. Peng, B. Jiang, and X. Li. "Crystal Structure of Red Lead Titanate Thin Films." Modern Physics Letters B 11, no. 26n27 (November 20, 1997): 1181–87. http://dx.doi.org/10.1142/s0217984997001419.

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Orange-red lead titanate thin films are examined by high-resolution transmission electron microscopy and diffraction. It is remarkable that the structure is based on that of tetragonal-tungsten-bronze (TTB) rather than perovskite-type. The chemical basis for this result is examined, it is deduced that the TTB structure is stabilized by inclusion of hydroxyl ions during synthesis by a sol–gel route involving hydrolysis of n-Butyl titanate.

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27

Lu, Chung-Hsin, and Buh-Kuan Fang. "Stabilization of lead lithium iron tungstate with adding barium titanate." Journal of Materials Research 12, no. 1 (January 1997): 13–16. http://dx.doi.org/10.1557/jmr.1997.0004.

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The kinetics of formation, phase stabilities, and dielectric constants of Pb(Li1/4Fe1/4W1/2)O3 and BaTiO3-added Pb(Li1/4Fe1/4W1/2)O3 have been compared. The addition of 2 mol% BaTiO3 in Pb(Li1/4Fe1/4W1/2)O3 was confirmed to promote the complete formation of the perovskite phase at 700 °C. Also, the thermal stability of the perovskite phase was significantly enhanced, which resulted in an increase of the dielectric permittivity.

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28

Pavlovic, Nina, Dragan Rajnovic, L. Sidjanin, and Vladimir V. Srdic. "Effect of Cerium and Lanthanum Addition on Mechanical Properties of Bismuth Titanate Ceramics." Key Engineering Materials 409 (March 2009): 330–33. http://dx.doi.org/10.4028/www.scientific.net/kem.409.330.

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Cerium- and lanthanum- substituted bismuth titanate (Bi4-xAxTi3O12; where A=La or Ce, and x=0, 0.5 and 1) ceramics were prepared from nanopowders synthesized by coprecipitation method. The as-synthesized powders were calcined, uniaxially pressed and finally sintered at 1050°C. It was shown that sintering behaviour, phase composition and grain morphology of the obtained ceramics were influenced by the presence of lanthanum and especially cerium ions in the titanate structure. Mechanical properties (hardness and fracture toughness) were measured at room temperature on polished sample surfaces using a Vickers microhardness tester. The hardness values for of bismuth titanate based ceramics were in the range for some other important perovskite titanate, whereas their fracture toughness was somewhat higher.

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29

Wada, Satoshi, Ai Nozawa, Shogo Iwatsuki, Tetsuo Kuwabara, Takahiro Takei, Nobuhiro Kumada, Petr Pulpan, and Hiroshi Uchida. "Dispersion of Barium Titanate and Strontium Titanate Nanocubes and their Selective Accumulations." Key Engineering Materials 445 (July 2010): 183–86. http://dx.doi.org/10.4028/www.scientific.net/kem.445.183.

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Barium titanate (BaTiO3, BT) and strontium titanate (SrTiO3, ST) nanocube particles were prepared by a solvothermal method. The prepared particles were collected by a centrifugal separator. The X-ray diffraction (XRD) measurement and a transmittance electron microscope (TEM) observation confirmed the formation of perovskite BT and ST nanocube particles with sizes of around 17 nm. These nanocube particles were monodistributed in hexane with tri-n-butylphosphine oxide (TBPO) as dispersant, separately, and then, the accumulations composed of the BT and ST nanocubes were built up using a selective catalytic reaction between 3-bromopropylphosphonic acid (BP) and aminomethylphosphonic acid (AM) as smart glue. The TEM observation confirmed that a part of accumulations showed a hetrointerface connection between BT and ST.

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30

Lu, Chung Hsin, and Po Chi Wu. "Hydrothermal Preparation and Characterization of Barium Titanate Powders." Key Engineering Materials 317-318 (August 2006): 53–56. http://dx.doi.org/10.4028/www.scientific.net/kem.317-318.53.

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Barium titanate powders were synthesized via a hydrothermal process at 120-180 using titanium oxide powder with different particle sizes as starting materials in this study. When micron-sized titanium oxide was used, pure perovskite phase was not formed because of the insufficient chemical reactivity of titanium oxide. However, as nano-sized titanium oxide was utilized, pure barium titanate was obtained after the hydrothermal process was performed at 180 oC. The effects of sintering temperature on the dielectric properties of barium titanate were also investigated. Densified ceramics with high dielectric constants were obtained after sintering at 1200oC.

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31

Ivanov, Konstantin V., Alexandr V. Agafonov, and Olyga V. Alexeeva. "MECHANOCHEMICAL SYNTHESIS OF CALCIUM TITANATE AND RESEARCH OF ITS PHOTOCATALYTIC ACTIVITY." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENIY KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 59, no. 6 (July 12, 2018): 83. http://dx.doi.org/10.6060/tcct.20165906.5384k.

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Recently much attention is paid to the synthesis and study of the properties of inorganic materials, based on alkaline earth titanates with a perovskite structure that have various polymorphic forms depending on the temperature. Calcium titatanat (CaTiO3) can be selected from the variety of perovskites because of its relatively high dielectric constant, unique photochemical properties, chemical stability, and compatibility with biological tissues, which leads to its application in microelectronics, photocatalysis and biomedicine as bone implants. In this paper, a solid-phase synthesis of calcium titanate was carried out by ceramic technology using mechanochemistry methods. This method allows to obtain calcium titanate directly by mechanochemical activation from the initial mixture of Ca (OH)2 and TiO2, which significantly reduces the energy consumption for its production. Structural changes in the synthesized material during calcination at 120 °C, 200 °C, 400 °C, 600 °C, and 800 °C were studied. The particle size and specific surface area of powders synthesized and calcined at 800 °C was measured by laser diffraction ("Analysette 22") and the low temperature (77K) nitrogen adsorption-desorption vapor, respectively. The phase composition of the obtained materials was studied by X-ray diffraction. It was found on the basis of studies of the particle size distribution that synthesized and calcined powders contain nanoparticles with sizes of 377 and 422 nm. The samples of CaTiO3 calcined at 120 °C and 800 °C have a mesoporous structure, the specific surface area was 46 and 7 m2/g, respectively, and average pore size in powders was 4 nm. It was found by the X-ray diffraction technique that the uncalcined sample contains admixtures of CaCO3 and TiO2 that can be removed completely at 600 °C.The photocatalytic activity of the synthesized material has been studied by the example of Rhodamine B dye decoloration on the calcium titanate calcined at 800°C. It was found that the decomposition degree of dye in solution was 77% for 80 min at a 6.7% shadow adsorption.

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32

Xue, Kan-Hao, Leonardo R. C. Fonseca, and Xiang-Shui Miao. "Ferroelectric fatigue in layered perovskites from self-energy corrected density functional theory." RSC Advances 7, no. 35 (2017): 21856–68. http://dx.doi.org/10.1039/c7ra01650f.

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We employed GGA-1/2 to investigate the band alignment between platinum and various layered perovskite Aurivillius ferroelectrics. A model is proposed for ferroelectric fatigue in bismuth titanate based on our calculation.

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Xu, Long, Jingwen Zhang, Hua Zhao, and Caixia Xu. "Controllable photoinduced scattering and optimized light emission intensity in Nd3+ doped (Pb,La)(Zr,Ti)O3 perovskite ceramics." RSC Adv. 7, no. 74 (2017): 47165–69. http://dx.doi.org/10.1039/c7ra07597a.

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Controllable photoinduced scatterers were investigated in Nd³⁺-doped lead lanthanum zirconate titanate (PLZT) perovskite ceramics, the total number of which will increase dramatically with the induction of light intensity.

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Yin, S. M., J. J. Duanmu, Y. H. Zhu, Y. F. Yuan, S. Y. Guo, J. L. Yang, Z. H. Ren, and G. R. Han. "Investigation on CO catalytic oxidation reaction kinetics of faceted perovskite nanostructures loaded with Pt." RSC Advances 7, no. 10 (2017): 6102–7. http://dx.doi.org/10.1039/c6ra24713j.

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Perovskite lead titanate nanostructures with specific {111}, {100} and {001} facets exposed, have been employed as supports to investigate the crystal facet effect on the growth and CO catalytic activity of Pt nanoparticles.

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Srikanth, V., and E. C. Subbarao. "Chemical reactions of lead magnesium niobate titanate in the presence of a glass." Journal of Materials Research 6, no. 6 (June 1991): 1308–23. http://dx.doi.org/10.1557/jmr.1991.1308.

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A relaxor ferroelectric of composition 0.93Pb(Mg1/3Nb2/3)O3-0.07PbTiO3 was sintered with 3 wt.% commercial sealing glass at 750 °C for 30 min to achieve ≥95% of theoretical density and a nearly pure perovskite phase. At higher glass additions (up to 20 wt.%), higher sintering temperatures (up to 800 °C), and longer sintering times (up to 4 h), the amount of perovskite (PMN type) decreases and that of pyrochlore (6PbO · MgO · 3Nb2O5 or 3PbO · 2Nb2O5) increases. On sintering at 800 °C for 4 h no perovskite phase is present in compositions with even 1% glass addition. The reaction of glass with the PMN phase was found to lead to the disappearance of the perovskite. Addition of 0.1 to 0.6 wt.% MgO to compositions containing 1 and 3 wt.% glass (and balance PMN-PT) results in essentially pure PMN perovskite phase on sintering at 700–800 °C for 30–240 min, confirming that the reaction of glass with PMN and depletion of MgO from PMN can be arrested. The sintered ceramics exhibit relaxor behavior and possess dielectric properties essentially commensurate with the phase composition.

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Jiang, J. C., W. Tian, C. D. Theis, D. G. Schlom, and X. Q. Pan. "Effect Of The Substrate Surface Termination On The Structure Of The Bi4Ti3O12 / SrTiO3 Interface." Microscopy and Microanalysis 5, S2 (August 1999): 104–5. http://dx.doi.org/10.1017/s1431927600013842.

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Bismuth titanate (Bi4Ti3O12) belongs to a family of layered perovskites (Aurivillius phases) that are important for nonvolatile ferroelectric memory applications. Recently epitaxial (001) Bi4Ti3O12 thin films have been grown on (001) SrTiO3 by reactive molecular beam epitaxy (MBE) in an adsorptioncontrolled growth regime. Bi4Ti3O12 has a monoclinic layered perovskite structure at room temperature which consists of alternating Bi2O2 and Bi4Ti3O10 perovskite layers (see the upper part of Fig. 1(b)). Due to the significant difference in crystal structure between film and substrate, the surface termination of the SrTiO3 substrate and the way in which growth is initiated might be expected to have a significant influence on the interfacial structure. In this work, we present high-resolution transmission electron microscope (HRTEM) studies of the Bi4Ti3O12 / SrTiO3 interfacial structure for Bi4Ti3O12 films grown on SrTiO3 substrates terminated with either the TiO2- or SrO-layers.Bi4Ti3O12 thin films were grown on SrO- or TiO2-layer terminated homoepitaxial SrTiO3 buffer layers grown on SrTiO3 (001) substrates by reactive MBE.

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Lee, Subin, Soyeon Kwak, Taehyun Park, Byoungchul Son, Hyung Joong Yun, Jaehyun Hur, and Hocheon Yoo. "Synthesis of Lead-Free CaTiO3 Oxide Perovskite Film through Solution Combustion Method and Its Thickness-Dependent Hysteresis Behaviors within 100 mV Operation." Molecules 26, no. 18 (September 7, 2021): 5446. http://dx.doi.org/10.3390/molecules26185446.

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Perovskite is attracting considerable interest because of its excellent semiconducting properties and optoelectronic performance. In particular, lead perovskites have been used extensively in photovoltaic, photodetectors, thin-film transistors, and various electronic applications. On the other hand, the elimination of lead is essential because of its strong toxicity. This paper reports the synthesis of lead-free calcium titanate perovskite (CaTiO3) using a solution-processed combustion method. The chemical and morphological properties of CaTiO3 were examined as a function of its thickness by scanning electron microscopy, X-ray diffraction (XRD), atomic force microscopy, X-ray photoelectron spectroscopy, and ultraviolet–visible spectrophotometry. The analysis showed that thicker films formed by a cumulative coating result in larger grains and more oxygen vacancies. Furthermore, thickness-dependent hysteresis behaviors were examined by fabricating a metal-CaTiO3-metal structure. The electrical hysteresis could be controlled over an extremely low voltage operation, as low as 100 mV, by varying the grain size and oxygen vacancies.

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Tursiloadi, S., H. Imai, and H. Hirashima. "Chemical Modification of Alkoxide Precursors for Lead Zirconate Titanate Formation." Australian Journal of Chemistry 49, no. 5 (1996): 569. http://dx.doi.org/10.1071/ch9960569.

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Lead zirconate titanate (PZT) gel monolith was prepared by partially hydrolysing metal alkoxide solutions which were modified with acetylacetone ( acacH ). Lead diisopropoxide zirconium tetrabutoxide and titanium tetraisopropoxide were used as starting materials. After aging of the translucent monolithic gel at room temperature for several days or drying at 90°C for 18 h, the most significant feature in the infrared spectrum is the presence of bands at about 1550 cm-1 which can be assigned to the v(C-O) and v(C-C) vibrations of the acetylacetonate group coordinated to the metal cations of titanium and zirconium. Diffraction peaks of PbO were found after heating at 300°C for 2 h. After heating at 450°C for 2 h, diffraction peaks of pyrochlore Pb2Ti2O6 and perovskite PZT phases were observed. The diffraction peaks of PbO and the pyrochlore phase disappeared after heating at 600°C, and the tetragonal perovskite phase was stable up to 1000°C. Diffraction peaks of the perovskite phase were also found after heating at 430°C for 24 h.

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39

Barudzija, Tanja, Alexey Gusev, Dragana Jugovic, Milena Marinovic-Cincovic, Miroslav Dramicanin, Miodrag Zdujic, Cedomir Jovalekic, and Miodrag Mitric. "Structural and magnetic properties of mechanochemically synthesized nanosized yttrium titanate." Chemical Industry 66, no. 3 (2012): 309–15. http://dx.doi.org/10.2298/hemind111103103b.

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Nanosized perovskite YTiO3 with the mean crystallite size of 18 nm was synthesized for the first time by mechanochemical treatment. The mechanochemical solid state reaction between commercial Y2O3 powder and mechanochemically synthesized TiO powder in molar ratio 0.5:1 was completed for 3 h in a high-energy planetary ball mill in argon atmosphere. The heating in vacuum at 1150 ?C for 12 h transforms nanosized YTiO3 to a well-crystallized single-phase perovskite YTiO3. Both samples were characterized by X-ray diffraction (XRD) and thermogravimetric (TGA/DTA) analyses, as well as superconducting quantum interference device magnetometer (SQUID) measurements.

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Pentón-Madrigal, A., Y. Mendez-González, A. Peláiz-Barranco, F. Calderón-Piñar, L. A. S. de Oliveira, J. Belhadi, and Y. Gagou. "Study ofAandBsites order in lanthanide-doped lead titanate ferroelectric system." Powder Diffraction 31, no. 1 (February 17, 2016): 23–30. http://dx.doi.org/10.1017/s0885715615000998.

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Pb0.88Ln0.08TiO3ferroelectric system, whereLn= La, Sm, Eu, and Dy, has been characterized using Scanning Electron Microscopy, Raman spectroscopy, and X-ray diffraction experiments. Softening of the lowest transverse optical phonon modeE(1TO) was evaluated as a function of the rare earths’ ionic radius suggesting partial occupation of lanthanide ions at theAandBsites of the perovskite structure. Using Rietveld refinements, it has been established a higher incorporation of Ln3+ions into theAsites of the perovskite structure than that of theBsites for the studied ceramics. The occupation atBsites increases slightly with the decreases of the ionic radii of the lanthanides.

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de Andrade, Mônica C., Geysa N. Carneiro, Elizabeth L. Moreira, Jorge C. Araújo, and Valéria C. A. Moraes. "Synthesis and Characterization of Barium Titanate by Solid-State Reaction." Materials Science Forum 802 (December 2014): 285–90. http://dx.doi.org/10.4028/www.scientific.net/msf.802.285.

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Solid-state reactions were used to synthesize pure and doped barium titanate powder. Barium titanate formation with tetragonal perovskite structure was detected by X-ray diffraction and occurred at a temperature above 700°C for pure powder and 500°C for doped powder. However, quite crystalline samples were observed only at 800oC and 600°C for pure and doped barium titanate, respectively, what made the refinement of the synthesized powders possible. They were characterized by X-ray diffraction and Fourier transform infrared spectroscopy and scanning electron microscopy. X-ray diffraction data was analyzed by using the Fullprof Rietveld refinement approach, Thompson-Cox-Hastings pseudo-Voigt with function. The refinement method was effective in the study of the temperature influence on the microstructure of the analysis of pure and doped barium titanate.

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Bongkarn, Theerachai, and P. Panya. "Fabrication of Lead Barium Titanate Ceramics via Conventional Solid-State Mixed Oxide Technique." Advanced Materials Research 55-57 (August 2008): 209–12. http://dx.doi.org/10.4028/www.scientific.net/amr.55-57.209.

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(Pb0.925Ba0.075)TiO3 (PBT) ceramics have been prepared using a mixed oxide technique. The phase formation and morphology were studied in detail via X-ray diffraction (XRD) and scanning electron microscopy (SEM). The pure tetragonal perovskite structure was discovered with calcination temperatures above 800 oC. The percentage of perovskite phase and particle size tends to increase with the increasing of calcination temperatures. The PBT ceramics sintered at various temperatures belonged to a pure tetragonal perovskite phase. The average grain sizes increased from 0.90 to 6.44 µm with the increase of sintering temperatures from 1100 to 1200 oC. The highest density was obtained from the sample that sintered at 1150 and 1200 oC

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43

Sun, Yi-Fei, Xin-Wen Zhou, Yimin Zeng, Babak Shalchi Amirkhiz, Meng-Ni Wang, Li-Zhong Zhang, Bin Hua, Jian Li, Jian-Hui Li, and Jing-Li Luo. "Correction: An ingenious Ni/Ce co-doped titanate based perovskite as a coking-tolerant anode material for direct hydrocarbon solid oxide fuel cells." Journal of Materials Chemistry A 5, no. 2 (2017): 851. http://dx.doi.org/10.1039/c6ta90257j.

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Correction for ‘An ingenious Ni/Ce co-doped titanate based perovskite as a coking-tolerant anode material for direct hydrocarbon solid oxide fuel cells’ by Yi-Fei Sun et al., J. Mater. Chem. A, 2015, 3, 22830–22838.

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44

Guo, Xin, Pardha Saradhi Maram, and Alexandra Navrotsky. "A correlation between formation enthalpy and ionic conductivity in perovskite-structured Li3xLa0.67−xTiO3 solid lithium ion conductors." Journal of Materials Chemistry A 5, no. 25 (2017): 12951–57. http://dx.doi.org/10.1039/c7ta02434g.

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The formation enthalpies of perovskite-structured lithium lanthanum titanate (LLTO) Li_3xLa_0.67−xTiO₃ (compositions x = 0.04 to 0.15) are exothermic and subject to two regimes with structural transformation.

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45

Deshmukh, V. V., H. P. Nagaswarupa, C. R. Ravikumar, M. R. Anil Kumar, T. R. Shashi Shekhar, and H. C. Ananda Murthy. "Lanthanum Doped Strontium Titanate Nanomaterial for Photocatalytic and Supercapacitor Applications." Asian Journal of Chemistry 32, no. 8 (2020): 2013–20. http://dx.doi.org/10.14233/ajchem.2020.22725.

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We report the synthesis of lanthanum doped strontium titanate (Sr1-xLaxTiO3,x=0.1) by sol-gel method. The physical properties of the as-synthesized sample were systematically studied through X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive X-ray spectroscopy (EDAX). Diffraction peaks in XRD supported the cubic formation of perovskite-type crystal structure. The image analysis of nanomaterial by SEM and TEM techniques disclosed aggregates of nanoparticles with grain size about 20 nm. The study by UV-DRS exposed the band energy gaps (Eg) of 3.4 eV for strontium titanate nanoparticles, respectively. The degradation studies for three days were carried out for three dyes. Malachite green and rhodamine blue, strontium titanate nanoparticles showed utmost photocatalytic activity for rhodamine blue under UV light irradiation (from 0 to 80 min) as compared to malachite green. Properties of electrochemistry were looked into by cyclic voltammetry and galvanostatic charge/discharge in 1M KCl electrolyte. The Sr0.9La0.1TiO3 electrode displayed maximal specific capacitance of 306.74 F g-1 at current 1mA from galvanostatic charge-discharge curve. The rare earth doped perovskite Sr0.9La0.1TiO3 nanomaterial exhibited increased surface area with superior supercapacitance property.

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Mitsui, Ryuta, Ichiro Fujii, Kouichi Nakashima, Nobuhiro Kumada, Takayuki Watanabe, Mikio Shimada, Jumpei Hayashi, et al. "Microstructure and Piezoelectric Properties of BaTiO₃-Bi(Mg_1/2Ti_1/2)O₃-BiFeO₃ Ceramics." Key Engineering Materials 566 (July 2013): 59–63. http://dx.doi.org/10.4028/www.scientific.net/kem.566.59.

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Barium titanate (BaTiO3, BT)-bismuth magnesium titanate (Bi (Mg1/2Ti1/2)O3, BMT)-bismuth ferrite (BiFeO3, BF) solid solution ceramics were prepared using a conventional solidstate synthesis, and their piezoelectric properties and microstructure were investigated. Strain electric field curves of the 0.3BT-0.1BMT-0.6BF ceramics with a single perovskite phase were ferroelectric butterfly-like curves. A strain maximum / electric field maximum (Smax/Emax) was 330 pm/V. Transmission electron microscopy revealed ferroelectric-like domain structure in the 0.3BT-0.1BMT-0.6BF ceramics.

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Долгинцев, Д. М., В. П. Пронин, Е. Ю. Каптелов, С. В. Сенкевич, and И. П. Пронин. "Исследование состава и фазового состояния тонких пленок цирконата-титаната свинца, полученных высокочастотным магнетронным осаждением, при изменении давления рабочего газа." Письма в журнал технической физики 45, no. 6 (2019): 3. http://dx.doi.org/10.21883/pjtf.2019.06.47488.17628.

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AbstractVariation of the working gas pressure (from 8 to 2 Pa) during RF magnetron sputtering deposition of thin perovskite lead zirconate titanate (PZT) films revealed strong changes in their lead content, which decreased below the stoichiometric level and led to the formation of a two-phase (perovskite–pyrochlore) structure upon subsequent high-temperature annealing. Measurements of the composition of perovskite islands in the two-phase films showed that the lead content in these islands was equal to or greater than stoichiometric. These results lead to the conclusion that the obtained PZT films are free of lead vacancies.

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OMATA, Koji, Xiaohong LI, Shouming YU, Yilu FU, and Kaoru FUJIMOTO. "Oxidative Coupling of Methane with Substituted Strontium Titanate Perovskite." Journal of The Japan Petroleum Institute 39, no. 1 (1996): 7–11. http://dx.doi.org/10.1627/jpi1958.39.7.

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Heremans, Catherine, and Harry L. Tuller. "Lead hafnate zirconate titanate-based perovskite materials for actuation." Journal of the European Ceramic Society 19, no. 6-7 (June 1999): 1133–37. http://dx.doi.org/10.1016/s0955-2219(98)00389-6.

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Ioachim, A., M. I. Toacsan, M. G. Banciu, L. Nedelcu, F. Vasiliu, H. V. Alexandru, C. Berbecaru, and G. Stoica. "Barium strontium titanate-based perovskite materials for microwave applications." Progress in Solid State Chemistry 35, no. 2-4 (January 2007): 513–20. http://dx.doi.org/10.1016/j.progsolidstchem.2007.01.017.

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