Relevant bibliographies by topics / ZrO2-TiO2

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  2. Dissertations / Theses
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Academic literature on the topic 'ZrO2-TiO2'

Author: Grafiati
Published: 4 June 2021
Last updated: 9 February 2022

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Journal articles on the topic "ZrO2-TiO2"

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Tachibana, Takashi, Tomohisa Yoshioka, Keizo Nakagawa, Takuji Shintani, Eiji Kamio, and Hideto Matsuyama. "Gas Permeation Characteristics of TiO2-ZrO2-Aromatic Organic Chelating Ligand (aOCL) Composite Membranes." Membranes 10, no. 12 (December 1, 2020): 388. http://dx.doi.org/10.3390/membranes10120388.

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Methyl gallate (MG) and ethyl ferulate (EF) with a benzene ring were separately used as aromatic organic chelating ligands (aOCLs) to prepare two versions of TiO2-ZrO2-aOCL composite sols via hydrolysis and polycondensation reactions with titanium(IV) isopropoxide (Ti(OC3H7)4) and zirconium(IV) butoxide (Zr(OC4H9)4). Thermogravimetric and FT-IR analysis of dry gels revealed that aromatic rings were present in the residual organic matter when the gel was fired under nitrogen at 300 °C. In X-ray diffraction (XRD) measurements, the TiO2-ZrO2 composite material prepared using these two aOCLs showed an amorphous structure with no crystalline peaks for TiO2 and ZrO2. In N2 adsorption/desorption measurements at 77 K, the TiO2-ZrO2 samples using the aOCLs as a template appeared porous with a larger specific surface area than TiO2-ZrO2 without aOCL. TiO2-ZrO2-aOCL composite membranes were prepared by coating and firing TiO2-ZrO2-aOCL sol onto a SiO2 intermediate layer using an α-alumina porous tube as a substrate. Compared with the TiO2-ZrO2 membrane, the TiO2-ZrO2-aOCL membranes had higher gas permselectivity. The TiO2-ZrO2-EF membrane showed a He permeance of 2.69 × 10−6 mol m−2 s−1 Pa−1 with permeance ratios of He/N2 = 10.6 and He/CF4 = 163, while the TiO2-ZrO2-MG membrane revealed a bit less He permeance at 8.56 × 10−7 mol m−2 s−1 Pa−1 with greater permeance ratios of He/N2 = 61.7 and He/CF4 = 209 at 200 °C. A microporous TiO2-ZrO2 amorphous structure was obtained by introducing aOCL. The differences in the side chains of each aOCL could possibly account for the differences in the microporous structures of the resultant TiO2-ZrO2-aOCL membranes.
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Yao, Bing Hua, Xiu Ping Han, Ying Lü, Chao Peng, and Cheng Jie Zhang. "Hydrothermal Synthesis and Photocatalytic Activity of TiO2-ZrO2 Hybrid Composite Microspheres ." Materials Science Forum 852 (April 2016): 257–63. http://dx.doi.org/10.4028/www.scientific.net/msf.852.257.

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The hollow TiO2-ZrO2 hybrid composite microspheres were successfully synthesized by hard template-hydrothermal method. The resulting materials were characterized by SEM, XRD, DRS, FT-IR and BET techniques. The results showed that the TiO2-ZrO2 hybrid composite microspheres with hollow structure were piled by TiO2 (anatase) and ZrO2 (monoclinic) hybrid nanoparticles. The specific surface area and the average pore size of the as-prepared samples were determined to be 224.6 m2/g and 4.159 nm, respectively. The photocatalytic activity of the samples was also evaluated by degradation of methylene blue (MB) compared to the hollow TiO2. It was found that the resultant TiO2-ZrO2 hollow microspheres show higher photocatalytic activity than hollow TiO2-ZrO2. The degradation rate of MB can be up to 99.4% after 60min of a high pressure mercury lamp (125W) irradiation.
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Lu, Xi Ning, and Cun Yi Song. "The Study of the MnOx/TiO2-ZrO2 Used in the Sintering Flue Gas Low-Temperature Selective Catalytic Reaction." Advanced Materials Research 641-642 (January 2013): 551–56. http://dx.doi.org/10.4028/www.scientific.net/amr.641-642.551.

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TiO2, 50%TiO2-ZrO2 and 80%TiO2-ZrO2 were prepared by sol-gel method. The manganese oxides were impregnated on the carrier and the catalysts were used for low-temperature selective catalytic reduction of NOx with ammonia (NH3-SCR) in the presence of excess O2. The samples were characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM). The results showed that the particle size of 80%TiO2-ZrO2 is the smallest among the three kind of carrier and the particles are highly dispersed. By adding the ZrO2, the Zr4+ ions replaced the lattice Ti4+ ions, and thus caused lattice distortion in the TiO2 and an increase of the active point amount on the carrier. Furthermore, the Zr also promoted the dispersion of the active ingredients carried on the carrier, increased the surface concentration of Mn. The most active catalyst was obtained with a mass MnOx/80%TiO2-ZrO2 ratio of 0.1.The best MnOx/80%TiO2-ZrO2 catalyst yielded nearly 92.6% NO conversion at 130°C at a high space velocity of 67,000 h-1.
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Manriquez, M. E., M. Picquart, X. Bokhimi, T. López, P. Quintana, and J. M. Coronado. "X-Ray Diffraction, and Raman Scattering Study of Nanostructured ZrO2-TiO2 Oxides Prepared by Sol–Gel." Journal of Nanoscience and Nanotechnology 8, no. 12 (December 1, 2008): 6623–29. http://dx.doi.org/10.1166/jnn.2008.18436.

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In the present work, we study the phase composition of ZrO2-TiO2 system by means of XRD and Raman spectroscopy, using also TG-ATD, and N2 adsorption isotherms as complementary characterization techniques. TiO2-ZrO2 samples of selected compositions (0, 10, 90, 50 and 100% in weight of TiO2) were prepared by sol–gel method and annealed at three different temperatures (400, 600 and 800 °C). Structural characterization reveals that only the pure oxides are crystalline at 400 °C: TiO2 as anatasa with a minor brookite component, and ZrO2 as a mixture of tetragonal (majority) and monoclinic phases. Following the 600 °C calcination, the TiO2-ZrO2 50–50% sample forms the ZrTiO4 mixed oxide, although this materials remains partly amorphous. In contrast, samples with higher and lower TiO2 content form solid solutions with, respectively, anatasa and tetragonal ZrO2 structures. Zirconium incorporation into the TiO2 lattice leads to the expansion of the unit cell parameters, and it stabilizes the anatase phase, hindering its transformation into rutile. Similarly, dissolving titanium atoms into the ZrO2 structure delays the transformation from the tetragonal to the monoclinic polymorph.
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Dini, Fitriyah Wulan, Helmiyati Helmiyati, and Yuni K. Krisnandi. "Cellulose and TiO2–ZrO2 Nanocomposite as a Catalyst for Glucose Conversion to 5-EMF." Bulletin of Chemical Reaction Engineering & Catalysis 16, no. 2 (April 16, 2021): 320–30. http://dx.doi.org/10.9767/bcrec.16.2.10320.320-330.

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This work demonstrated the use of green material catalysts, produced from Sengon sawdust waste, to obtain nanocellulose biopolymers. The green material catalysts were utilized as catalysts support of TiO2−ZrO2 binary oxide in the form of nanocomposite materials with superior synergistic properties. The isolation of nanocellulose was achieved using a hydrolysis method with a yield of 63.40%. The TiO2 and ZrO2 nanoparticles have average particle sizes of around 25 and 15 nm, respectively, and the binary oxides of TiO2–ZrO2 pretained an average particle size of 30 nm were used. Furthermore, the nanocellulose combined with the TiO2−ZrO2 binary oxide had formed a cellulose/TiO2−ZrO2 nanocomposite with an average particle size of 30 nm. This indicates that the supporting nanocellulose can stabilize the nanoparticles and avoid aggregation. Moreover, the nanocomposites can be used as a catalyst for the conversion of glucose to 5-ethoxymethylfurfural (5-EMF). The catalytic activity increased with the nanoparticle effect obtained ZrO2, TiO2, TiO2-ZrO2, and cellulose and TiO2-ZrO2 nanocomposite, in 15.50%, 20.20%, 35.20%, and 45.50% yields, respectively. The best yield of 5-EMF was 45.50%, with reaction conditions of 1:1 TiO2–ZrO2 ratio, 4 h reaction time, and 160 °C reaction temperature. The use of nanocellulose biopolymer generated from Sengon sawdust waste in Indonesia provides a promising catalyst support material as an alternative green catalyst. In addition, the glucose carbohydrates can be converted to biofuel feedstocks in the development of a renewable alternative energy. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
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Reddy, Benjaram M., Biswajit Chowdhury, and Panagiotis G. Smirniotis. "An XPS study of the dispersion of MoO3 on TiO2–ZrO2, TiO2–SiO2, TiO2–Al2O3, SiO2–ZrO2, and SiO2–TiO2–ZrO2 mixed oxides." Applied Catalysis A: General 211, no. 1 (March 2001): 19–30. http://dx.doi.org/10.1016/s0926-860x(00)00834-6.

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Ivanova, T., A. Harizanova, T. Koutzarova, N. Krins, and B. Vertruyen. "Electrochromic TiO2, ZrO2 and TiO2–ZrO2 thin films by dip-coating method." Materials Science and Engineering: B 165, no. 3 (December 2009): 212–16. http://dx.doi.org/10.1016/j.mseb.2009.07.013.

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Ramenzoni, Liza L., Laura B. Flückiger, Thomas Attin, and Patrick R. Schmidlin. "Effect of Titanium and Zirconium Oxide Microparticles on Pro-Inflammatory Response in Human Macrophages under Induced Sterile Inflammation: An In Vitro Study." Materials 14, no. 15 (July 27, 2021): 4166. http://dx.doi.org/10.3390/ma14154166.

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The wear-debris particles released by shearing forces during dental implant insertion may contribute to inflammatory reactions or osteolysis associated with peri-implantitis by stimulating inflammasome-activation. The study aim was to examine cytotoxic and pro-inflammatory effects of titanium (TiO2) and zirconia (ZrO2) particles in macrophages regarding their nature/particle concentration over time under sterile lipopolysaccharide (LPS) inflammation. Macrophages were exposed to TiO2 and ZrO2 particles (≤5 µm) in cell culture. Dental glass was used as inert control and LPS (1 μg/mL) was used to promote sterile inflammation. Cytotoxicity was determined using MTT assays and cytokine expression of TNF-α, IL-1β and IL-6 was evaluated by qRT-PCR. Data were analyzed using Student’s t-test and ANOVA (p ≤ 0.05). Cytotoxicity was significantly increased when exposed to higher concentrations of glass, TiO2 and ZrO2 (≥107 particles/mL) compared to controls (p ≤ 0.05). Macrophages challenged with TiO2 particles expressed up to ≈3.5-fold higher upregulation than ZrO2 from 12 to 48 h. However, when exposed to LPS, TiO2 and ZrO2 particle-induced pro-inflammatory gene expression was further enhanced (p ≤ 0.05). Our data suggest that ZrO2 particles produce less toxicity/inflammatory cytokine production than TiO2. The present study shows that the biological reactivity of TiO2 and ZrO2 depends on the type and concentration of particles in a time-dependent manner.
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Thepwatee, Sukanya, Nitipon Chekuntod, Atisayapan Chanchawee, and Pawnprapa Pitakjakpipop. "Light-Enhanced Adsorptive Desulfurization of Dibenzothiophene Using Supported TiO2-ZrO2." Key Engineering Materials 798 (April 2019): 391–96. http://dx.doi.org/10.4028/www.scientific.net/kem.798.391.

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Combustion of diesel fuel containing sulfur compounds emits SOx into atmosphere causing acid rain and respiratory illness in human. Dibenzothiophene (DBT) is one of the most difficult sulfur compounds in diesel to be removed by hydrodesulfurization (HDS). To produce ultra-low sulfur diesel (<15 ppmw-S), severe operating condition is required. As a result, production cost is increase. In this work, we investigated an alternative method for sulfur removal called Light-enhanced Adsorptive Desulfurization or L-ADS using supported TiO2-ZrO2. The TiO2-ZrO2 was loaded on commercial γ-Al2O3, fumed silica (FS), silica gel (SG) and zeolite (Z30) by wet-impregnation method. Impact of these supports on DBT removal were focused. Characteristic of the supported TiO2-ZrO2 was analyzed by N2 adsorption-desorption, scanning electron microscopy equipped with energy dispersive spectroscopy (SEM-EDS), and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). The presence of TiO2-ZrO2 greatly enhanced DBT removal compared to TiO2 and ZrO2. SG promoted DBT removal by facilitating the adsorption of dibenzothiophene sulfone (DBTO2), a product of DBT photocatalytic oxidation. Using TiO2-ZrO2/SG, 86% of sulfur was removed from 50 ppmw-S DBT/C16 within 4 h.
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Nguyen Thi Hai, Yen, Hai Le Thị Hong, and Thao Pham Minh. "Synthesis nanocompsite TiO2-ZrO2 for photocatalic degration of phenol and methylene blue (MB)." Vietnam Journal of Catalysis and Adsorption 9, no. 3 (October 3, 2020): 101–6. http://dx.doi.org/10.51316/jca.2020.057.

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A series of TiO2-ZrO2 binary oxide samples with various TiO2-ZrO2 content (90-10, 80-20, 70-30, 60-40, 50-50 mol %) were prepared by the co-precipitation method. The obtained samples were characterized by XRD, SEM, EDX, UV-vis, IR spectroscopy and BET. XRD data identified the anatase phase of the TiO2 and tetragonal, monoclinic phases of ZrO2 in all obtained samples. The average crystallite size of the samples was between 16 to 21 nm. As UV-Vis spectra, the band gaps of TiO2-ZrO2 composites vary from 2,5 eV to 3,1 eV. The photocatalytic reactions confirmed that the nanocomposite sample showed higher photocatalytic activity than the pure oxides samples for the degradation of phenol and methylene blue (MB) under 100 W incandescent lamp. Among the prepared samples, the best sample for photocatalytic degration of MB is the ĐKT9-1 which contains 90% TiO2 and 10% ZrO2 with a percentage 95% after 180 minutes. The ĐKT8-2 which contains 80% TiO2 and 20% ZrO2 shows the best phenol removal efficiency of 97% after 30 minutes. This indicates that the materials are capable of treating MB and phenol in wastewater.
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Dissertations / Theses on the topic "ZrO2-TiO2"

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Andrianainarivelo, Mahandrimanana. "Homogénéité d'oxydes mixtes SiO2-ZrO2, SiO2-TiO2, TiO2-ZrO2, Al2O3-TiO2 et Al2O3-SiO2 préparés par sol-gel non hydrolytiques." Montpellier 2, 1996. http://www.theses.fr/1996MON20077.

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Dans ce travail, nous avons prepare des oxydes mixtes: sio#2-zro#2, sio#2-tio#2, tio#2-zro#2, al#2o#3-tio#2 et al#2o#3-sio#2 par un procede sol-gel non hydrolytique base sur la condensation des chlorures metalliques et les alcoxydes metalliques ou entre des chlorures metalliques et des donneurs d'oxygene tels que les ethers. Les rendements en oxydes obtenus apres elimination des groupements organiques residuels sont eleves. Edx et icp nous ont permis de montrer que la composition des oxydes finaux dependait directement de la stoechiometrie des precurseurs. L'homogeneite des gels a ete determinee par leur comportement a la cristallisation et par rmn du #2#9si et ir. Les gels bicomposants obtenus par la voie sol-gel non hydrolytique sont homogenes sauf lorsque le taux de titane est superieur a 8. 5% dans le systeme sio#2/tio#2
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Dressler, Martina [Verfasser]. "Kristallisationskinetik in TiO2/ZrO2, SnO2/ZrO2 und ZrO2-haltigen LAS-Glaskeramiken mittels der Hochtemperaturröntgenbeugung / Martina Dressler." München : Verlag Dr. Hut, 2012. http://d-nb.info/102878533X/34.

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Kratschmer, Tim. "Flammgespritzte Schichten im System Al2O3-TiO2-ZrO2." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2011. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-63845.

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Beim Flammspritzen von Mischungen im System Al2O3-TiO2-ZrO2 treten vielfältige Effekte auf. Es kommt z.B. zur Ausbildung eines amorphen Anteils, der in Form von amorphen Sublamellen, dem primären amorphen Anteil, und in dendritisch geprägten Bereichen, dem sekundären amorphen Anteil im Gefüge vorliegt. Dieser beeinflusst die mechanischen Eigenschaften deutlich. Bei einer Temperaturbehandlung entstehende Ausscheidungen von ZrO2 oder verschiedenen Zirkoniumtitanaten beeinflussen die mechanischen Eigenschaften ebenfalls signifikant.
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Silva, P. D. G. "Síntese e caracterização do core-shell ZrO2:Y3+@TiO2." Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/6453.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES
Since the early 90's researchers have investigated the combination of nanocomposites comprised of multilayers, which have better efficiency than their corresponding individual particles, may present in certain cases, new properties. The resulting structure is called a core-shell. In this study, were synthesized ZrO2:Y 3+ coated with TiO2, obtaining nanocomposites ZrO2:Y 3+ @TiO2 with a thickness of 10, 20 and 50% shell. The photoluminescent property (FL) of the nanocomposites was studied. Such interest is due to the fact that the order/disorder structural at the interface of the core-shell type systems may be possible recombination processes responsible for the photoluminescence emission of these materials. Nanoparticles of the core and the shell were obtained by the Method of Polymeric Precursors. The samples were characterized by X-ray diffraction (XRD) to identify the formation of the nanocomposite and evaluate the structural order in the synthesized materials. The core was obtained with tetragonal structure and the shell with anatase structure. From the diffractograms have been carried out calculations of the crystallite size and lattice parameters. The characterization by Transmission Electron Microscopy (TEM), it was not possible to differentiate the core of the shell by the images, since both are structurally ordered, requiring analysis by Energy Dispersive X-ray (EDX), which was verified the presence of Zr and Ti elements that comprise the core-shell nanocomposite. The FL emission results were explained as a function of the shell thickness, as well as the effect of calcination temperature on the order-disorder structural material. To evaluate the performance of the FL issuing nanocomposites were calculated chromaticity coordinates, based on the FL emission spectra.
Desde o início da década de 90 pesquisadores vêm investigando a combinação de nanocompósitos constituídos por multicamadas, os quais apresentam melhor eficiência do que suas partículas individuais correspondentes, podendo apresentar em alguns casos, novas propriedades. A estrutura obtida é denominada core shell. No presente trabalho, foram sintetizados ZrO2:Y 3+ recobertos com TiO2, obtendo nanocompósitos ZrO2:Y 3+ @TiO2 com espessura de 10, 20 e 50% de shell. Foi estudada a propriedade fotoluminescente (FL) dos nanocompósitos. Tal interesse deve-se ao fato de que a ordem/desordem estrutural na interface dos sistemas do tipo core-shell pode ser possibilitar processos de recombinação responsáveis pela emissão fotoluminescente destes materiais. As nanopartículas do core e do shell foram obtidos pelo Método dos Precursores Poliméricos. As amostras foram caracterizadas por difração de Raios X (DRX) a fim de se identificar a formação do nanocompósito e avaliar a ordem estrutural nos materiais sintetizados. O core foi obtido com estrutura tetragonal e o shell com estrutura anatase. A partir dos difratogramas foram realizados cálculos do tamanho de cristalito e parâmetros de rede. Na caracterização por Microscopia Eletrônica de Transmissão (MET), não foi possível diferenciar o core do shell pelas imagens, uma vez que ambos encontram-se estruturalmente ordenados, sendo necessária a análise por Energia Dispersiva de Raios X (EDX), na qual verificou-se a presença dos elementos Zr e Ti que compõem o nanocompósito core-shell. Os resultados de emissão FL foram explicados em função da espessura do shell, bem como pelo efeito da temperatura de calcinação na ordem-desordem estrutural do material. Para avaliar o desempenho da emissão FL dos nanocompósitos foram calculadas as coordenadas de cromaticidade, baseado nos espectros de emissão FL.
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Konishi, Junko. "Studies on functional TiO2 and ZrO2 monoliths with controlled porous structures." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/136298.

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Modesto, Junior Olayr. "Caracterização e aplicação fotocatalítica de compósitos óxidos TiO2/CuO, TiO2/ZnO E TiO2/ZrO2 sintetizados pelos processos Sol-gel e Poliol. /." Bauru, 2018. http://hdl.handle.net/11449/158268.

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Orientador: Dayse Iara dos Santos
Resumo: O desenvolvimento de materiais cerâmicos é um campo de pesquisa cujos resultados são extremamente promissores para aplicações tecnológicas. Particularmente, no caso dos materiais nanoestruturados baseados no óxido titânio, observa-se grande potencial de aplicação em dispositivos optoeletrônicos, bem como, para processos de fotocatálise, visto que apresenta um bandgap direto de 3,2 eV. Além disso, o aperfeiçoamento das propriedades ópticas, por meio da interação entre óxidos de diferentes bandas eletrônicas, têm sido estudado por muitos autores. Por esta razão, compósitos nanoestruturados formados de dois ou mais óxidos, cujas propriedades são distintas quando isolados, têm sido sintetizados juntos e caracterizados a fim de avaliar possíveis interações sinérgicas. Neste trabalho, foram preparados e caracterizados os compósitos TiO2/CuO, TiO2/ZnO e TiO2/ZrO2. As sínteses foram realizadas pelo método Sol-gel original e pelo método Poliol modificado, e ambos os processos se mostraram propícios para a obtenção de nanocompósitos e óxidos nanoparticulados. O método Poliol produziu compósitos formados de partículas micrométricas de dióxido de titânio revestidas do segundo óxido, enquanto o processo Sol-gel resultou em material constituído de agregados de nanocristais com alta mesoporosidade. Por meio da difração de raios X dos pós tratados gradualmente até 1000 °C observou-se que a formação e cristalização dos óxidos ocorrem em temperatura mais alta quando o material é resultante do ... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: The development of ceramic materials is a field of research whose results are extremely promising for technological applications. Particularly, in the case of nanostructured materials based on titanium oxide, there is a great potential for application in optoelectronic devices, as well as for photocatalysis processes, since it has a direct bandgap of 3.2 eV. In addition, the improvement of the optical properties through the interaction between oxides of different electronic bands has been studied by many authors. For this reason, nanostructured composites formed of two or more oxides, whose properties are distinct when isolated, have been synthesized together and characterized in order to evaluate possible synergistic interactions. In this work the TiO2 / CuO, TiO2 / ZnO and TiO2 / ZrO2 composites were prepared and characterized. The syntheses were carried out using the original Sol-gel method and the modified Polyol method, and both processes proved to be suitable for nanocomposites and nanoparticulate oxides. The polyol method produced composites formed of micrometric titanium dioxide particles coated with the second oxide, while the sol-gel process resulted in material composed of nanocrystalline aggregates with high mesoporosity. By X-ray diffraction of the powders gradually treated to 1000 °C it was observed that the formation and crystallization of the oxides occur at a higher temperature when the material is produced by the Sol-gel process. With the observation of the ... (Complete abstract click electronic access below)
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FERREIRA, Katiúscia Daiane. "ESTUDO DE FASES E CRESCIMENTO DE MONOCRISTAIS NO SISTEMA Bi2O3 - TiO2 - ZrO2." Universidade Federal de Goiás, 2008. http://repositorio.bc.ufg.br/tede/handle/tde/1044.

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I n this work a systematic study on the phase formation and stability in the system Bi2O3-ZrO2 was realized, the solubility of the Zr4+ ion in Bi12TiO20 (BTO) was investigated and Zr-doped BTO crystals (BTO:Zr) were grown and optically characterized. It was verified that a tetragonal phase was formed in the following wide composition interval: (6-x)Bi2O3:(1+x)ZrO2, with x = 0.5, 0.3, 0.2, 0.1, 0, -0.1, -0.2, -0.3, -0.5, -0.65 e -0.7. The phases were synthesized by solid state reaction and the powders were characterized by Xray diffraction and diferential thermal analysis. The formed tetragonal phase, however, was metastable for all investigated compositions and its preparation was dependent on the sample thermal history. The stable phase at room temperature was a monoclinic one. A low solubility of Zr4+ in BTO was verified, but BTO:Zr single crystals were grown by Top Seeded Solution Growth (TSSG) technique. Good quality crystalline samples were prepared and characterized by chemical compositon and by optical activity, photoconductivity and electro-optical measurements. The results shown that Zr-doping produced a decreasing in the crystal photosensitivity, and almost no changes in the optical activity and electro-optical coefficient were generated.
Neste trabalho foi realizado um estudo sistemático das condições de preparação e estabilidade de fases no sistema Bi2O3-ZrO2, a solubilidade do íon Zr4+ no Bi12TiO20 (BTO) foi investigada e cristais de BTO dopados com Zr4+ (BTO:Zr) foram crescidos e caracterizados opticamente. Verificou-se que uma fase tetragonal é formada no amplo intervalo de composições (6- x)Bi2O3:(1+x)ZrO2, com x = 0,5, 0,3, 0,2, 0,1, 0, -0,1, -0.2, -0,3, -0,5, -0,65 e - 0,7. As fases foram sintetizadas por reação no estado sólido e os pós foram caracterizados por difração de raios-X e análise térmica diferencial. A fase tetragonal formada, no entanto, é metaestável em todo o intervalo de composições investigadas, sendo sua obtenção condicionada à história térmica da amostra. A fase estável à temperatura ambiente é monoclínica. Foi constatado que a solubilidade do Zr4+ no BTO é baixa, mas cristais de BTO:Zr foram crescidos através da técnica Top Seeded Solution Growth (TSSG). Amostras cristalinas de boa qualidade óptica e estrutural foram preparadas e caracterizadas quanto à composição química e através de medidas de atividade óptica, fotocondutividade e coeficiente eletro-óptico. Os resultados demonstram que o Zr produz uma diminuição na fotosensibilidade do cristal, provocando pouca alteração nos valores de atividade óptica e coeficiente eletro-óptico
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8

Angulo, Pedoro Antonio Diaz. "Microstructural characterization of a plasma sprayed ZrO2-Y2O3-TiO2 thermal barrier coating." Thesis, Brunel University, 1996. http://bura.brunel.ac.uk/handle/2438/6293.

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The use of plasma sprayed ceramic coats as thermal barrier coatings (TBCs) for the protection of metallic structures and equipment from severe thermal, abrasive and corrosive conditions has been documented extensively in the last two decades. The state-of-the-art TBCs consist of a double layer coat. a top ceramic layer and an intermediate bond coat (MCrAIY, M=Ni, Co, Fe) deposited on the alloy substrate. Zirconia, both stabilized and partially stabilized with different oxides has been used as the ceramic top coat due to its low thermal conductivity and low thermal expansion coefficient. Studies of the microstructure of the TBCs have shown aspects that can help the understanding of the properties of the coating. The ternary system ZrOz-Y203-TiCz is believed to offer improved properties when it is compared to Zr02-Y203. However, the use of &02-Y203-Ti02 as TBCs, a major part of this work, is not widely reported in the literature. The purpose of this thesis was to study the microstructure of a plasma sprayed ZrOrY203-TiO2 TBC using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), and Transmission Electron Microscopy (TEM). The evolution of the Zr41_phase distribution in the ceramic coat was followed by XRD after different heat treatments, with the finding that the cooling rate plays a decisive role in the final Zr42 phase composition. SEM studies allowed a description of the lamellae structure of the Zr02-Y203-TiOz coating. The evolution of the morphology, porosity and crack distribution in the coat after different thermal treatments were followed by SEM. Evidence of incipient sintering is observed in Zr02-Y203-Ti02 coats heated at temperatures higher than 1200 °C. This should lead to poor coating performance. EDS analysis revealed an heterogeneous distribution of titanium through the oating. A detailed microstructural characterization of the as-sprayed coating was done using TEM. Microstructural features such as micro-twins, antiphase-boundaries and mottled morphology associated with "non-transformable" tetragonal ZrO2 phase were identified. It is believed that these microstructural elements promote toughening and thermal stress relief mechanisms that provide the coating with the erosion and thermal shock resistance required for a TBC. The presence of TiO2 is linked to a higher proportion of tetragonal ZrO2 in the Zr02-Y203-Ti02 coating, therefore improved properties of the coating are expected. The addition of TiO2 promotes grain growth and decreases the final density in pressed and sintered Zr02-Y203-TiO2 powders. The results obtained are a contribution to the understanding of the microstructure of TBCs and to the sparse knowledge base of the ZrOrY2O3-TiO2 coatings. Further work should be done in the characterization of the ZrO2-Y2O3-Ti42 coatings and the study of its stability under different conditions in order to determine the real potential of this material offers as an alternative to the better known ZrOrY203 TBC.
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9

Lahcene, Driss. "Synthèse et caractérisation des oxydes mixtes type MxOy-TiO2 (M = V, Zr et Si) par voie sol-gel. Application à l'époxydation du cyclohexène." Thesis, Poitiers, 2013. http://www.theses.fr/2013POIT2263.

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L'objectif de ce travail est : (i) pour préparer des oxydes mixtes X% MxOy-TiO2 (M = V, Zr et Si), (X = 5, 10, 15 et 20 wt-.% MxOy.) par la méthode sol-gel et suivie par une calcination à 500° C, (ii) de caractériser les échantillons préparés par différentes méthodes d'analyse physico-chimique (AAF, ICP, DRX, BET, TG-DTA et FT-IR) et (iii) d'étudier leur réactivité dans l'époxydation de cyclohexène.D'après les résultats des caractérisations, nous constatons que :- L'analyse DRX montre que pour les trois systèmes nous avons l'apparition de la phase anatase de TiO2. La meilleure cristallinité a été observée pour le système en présence de V2O5. La phase de SiO2 est amorphe et la phase de ZrO2 n'a pas été détectée.- L'analyse par adsorption d'azote, donne le classement de ces systèmes selon leurs surfaces spécifiques comme suit :SiO2-TiO2>ZrO2-TiO2>V2O5-TiO2- L'analyse FT-IR de l'adsorption de la pyridine in situ montre que les trois systèmes présentent des sites acides de Lewis, alors que le 15%V2O5-TiO2 présente en plus les sites de Brönsted.Nous avons étudié aussi l'influence de divers paramètres expérimentaux sur la réaction d'époxydation du cyclohexène. Les résultats des tests catalytiques montrent que :- Les meilleurs résultats sont obtenus pour le système V2O5-TiO2.- Les meilleurs solvants sont l'heptane et l'acétonitrile qui donnent une bonne activité catalytique et une bonne sélectivité en époxyde.- La réaction d'époxydation du cyclohexène est une réaction du second ordre.- Le catalyseur 20% V2O5-TiO2 est stable au cours de la réaction catalytique et recyclable
The aim of this work is: (i) to prepare mixed oxides X%MxOy-TiO2 (M = V, Zr and Si), (X = 5, 10, 15 and 20 wt.-% MxOy) by sol-gel method followed by calcination at 500°C, (ii) to characterize the prepared samples by different methods of physicochemical analysis (AAF, ICP, XRD, BET, TG-DTA and FT-IR) and (iii) to study their reactivity in the epoxidation of cyclohexene. According to the characterization results, we found that:- The XRD analysis shows that, for the three systems, TiO2 anatase has been evidenced. The best crystallinity was observed for the V2O5-TiO2 system. The TiO2 rutile phase has been obeserved for sample 5% ZrO2-TiO2, while the SiO2 phase is amorphous and ZrO2 phase was not detected.- Analysis by nitrogen adsorption, gave the sorting of these systems according to their specific surface areas as follows: SiO2-TiO2 > ZrO2-TiO2 > TiO2-V2O5- The FTIR analysis of in situ pyridine adsorption showed that all three systems display Lewis acid sites, whereassample 15% V2O5-TiO2 present Bronsted sites too.We studied the effect of different reaction parameters in the oxidation of cyclohexene. The results of the catalytic tests show that:- The best results are obtained for V2O5-TiO2 system.- The best solvents are heptane and acetonitrile which give good catalytic activity and high epoxide selectivity.- The epoxidation reaction of cyclohexene is a second-order reaction.- The catalyst 20%V2O5-TiO2 is stable during the catalytic reaction and suitable for recycling
الهدف من هذا العمل هو تحضير أكاسيد المختلطةX%MxOy-TiO2, (M = V, Zr et Si), (X = 5, 10, 15 et 20 %) ، حيث X هو نسبة كتلة MxOy. تشخيص ودراسة نشاطها في اكسدة الهكسن الحلقي بوجود (TBHP) في الطور السائل. تم تحضير هذه أكاسيد المختلطة بطريقة sol-gel و حرقها تحت درجة حرارة 500 وتشخص هذه المواد بطرق مختلفة من التحليل الفيزيائية و الكيميائية (AAF, ICP, DRX, BET, ATG-ATD et FT-IR)وفقا لنتائج التشخيص نستخلص مايلي:-التحليل DRX تبين أن الأنظمة الثلاثة لديها طور anatase TiO2 ولوحظ أفضل التبلور في وجود نظام V2O5. وقد وجد طور rutile من TiO2 عن عينة 5%ZrO2-TiO2، في حين أن طور SiO2 غير متبلور ولم يتم الكشف طور ZrO2- تحليل عن طريق امتزاز النيتروجين BET ويعطي تصنيف هذه النظم حسب المساحة المحددة على النحو التالي:SiO2-TiO2> ZrO2-TiO2> TiO2-V2O5- أظهر تحليل FTIR بامتصاص بيريدين أن جميع الأنظمة الثلاثة لديها مواقع حمض لويس، في حين أن15%V2O5-TiO2 لديه بالإضافة مواقع برونستيد.درسنا أيضا تأثيرعدة عوامل التجريبية على تفاعل اكسدة الهكسن الحلقي بما في ذلك تأثير المذيب، كتلة المحفز، دراسة استقرار المحفز ودراسة الحركية التفاعل لتحسين المردودية و الانتقائية لإيبوكسيد.نتائج التفاعل المحفز تظهر أن:- تم الحصول على أفضل النتائج بوجود النظام V2O5-TiO2- أفضل المذيبات هي هيبتان والأسيتونيتريل لإعطاء فعالية جيدة وانتقائية عالية لإيبوكسيد.- تم الحصول على أفضل النتائج في حالة 100 و 150 ملغ مع تحويل 46 و 53٪ على التوالي. ولوحظ ان أفضل الانتقائية لإيبوكسيد (79٪) سجلت عند 100 ملغ من20 % V2O5-TiO2.رتبة تفاعل اكسدة الهكسن الحلقي في وجود 150 ملغ من 20 % V2O5-TiO2هي رتبة اثنين. المحفز 20 % V2O5-TiO2 هو مستقر خلال تفاعل تحفيز ومناسبة لإعادته عدة مرات.كلمات المفتاحية: سول جل، أكاسيد المختلطة، أكسدة الهكسن الحلقي، أوكسيد الهكسن الحلقي V2O5-TiO2, ZrO2-TiO2, SiO2-TiO2
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Castelblanco, William Nova. "Redução de NO com CO sobre catalisadores de CuO, Fe2O3 e CuO-Fe2O3 suportados em TiO2, ZrO2 e TiO2-ZrO2: Efeito do vapor de água na atividade e seletividade a N2." Universidade Federal de São Carlos, 2013. https://repositorio.ufscar.br/handle/ufscar/4124.

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The combustion of petroleum fuels produces large emissions of NOX, SOX and other strong atmospheric pollutants. The abatement of NOX can be achieved by the nonselective catalytic reduction of NO with CO, for that, supported noble metals have been the most commonly used, with high cost as disadvantage. Transition metal oxides show good activity for this reaction, however, they have poor performance in the presence of SO2, O2 and water steam. Thus, this study aimed to prepare, characterize and evaluate catalysts based on CuO, Fe2O3 and CuO-Fe2O3 supported on TiO2, ZrO2 and their mixtures, in the reduction of NO to N2 with CO in the presence or absence of water steam. XRD data, N2 adsorption and H2-TPR showed that mixed oxides and their catalysts, prepared by sol-gel in-situ, presented specific surface areas between 30 to 60 m2/g, with Cu or Fe species highly distributed, having the last greater interaction with titanium. Rietveld refinement showed preferential formation of zirconium titanate, then showing a close interaction of these species in the mixed supports. All catalysts were highly active in the reduction of NO to N2. At temperatures below 500 °C a CuO catalysts were more active and selective for the formation of N2 than Fe2O3, with the formation of N2O being favored with the increase of zirconium in the support. At 600 °C, the high conversion of NO to N2 on CuO was not influenced by the content of TiO2 in the support. Also at 600 °C, an increasing in the content of titanium in the Fe2O3 catalysts resulted in a significant drop in the conversion of NO to N2. The presence of water steam during the reduction of NO with CO at 600 °C caused a significant decrease in the conversion of NO to N2 and CO to CO2 on the CuO catalyst on the support with higher titanium content. The water steam completely eliminates the activity for the reduction of NO to N2 on Fe2O3 catalysts, but keeping a high conversion of CO to CO2. The CuO and CuO-Fe2O3 catalysts on zirconium-rich supports showed high potential for the abatement of NOX in the presence of water steam at temperatures above 500 ºC.
A combustão de derivados do petróleo gera grandes emissões de NOX, SOX e outros fortes poluentes da atmosfera. O abatimento de NOX pode ser realizado por meio da redução catalítica não seletiva com CO, onde os metais nobres suportados têm sido os mais empregados, com a desvantagem de seu elevado custo. Óxidos de metais de transição apresentam boa atividade nessa reação, no entanto, têm baixo desempenho na presença de SO2, O2 e vapor de água. Assim, este trabalho teve como objetivo preparar, caracterizar e avaliar catalisadores a base de CuO, Fe2O3 e CuO-Fe2O3 suportados em TiO2, ZrO2 ou suas misturas, na redução de NO a N2 com CO na presença ou ausência de vapor de água. Dados de DRX, adsorção de N2 e RTP-H2 mostraram que os suportes mistos e seus catalisadores, que foram preparados via síntese sol-gel in-situ, apresentaram áreas superficiais específicas entre 30 e 60 m2/g, com as espécies de Cu ou Fe altamente distribuídas, tendo essas últimas maior interação com a titânia. Refinamento de Rietveld mostrou formação preferencial de titanato de zircônia, evidenciando a estreita interação dessas espécies nos suportes mistos. Todos os catalisadores foram altamente ativos na redução de NO a N2. Em temperaturas inferiores 500 ºC os catalisadores de CuO foram mais ativos e seletivos à formação de N2 que o Fe2O3, com a formação de N2O sendo favorecida com o aumento de zircônia no suporte. A 600 ºC, a alta conversão de NO a N2 sobre CuO não foi influenciada pelo conteúdo de TiO2 no suporte. Nessa temperatura, o aumento do teor de titânia provocou nos catalisadores de Fe2O3 uma queda significativa na conversão de NO a N2. A presença de vapor de água durante a redução de NO com CO a 600 ºC provocou sobre CuO queda significativa da conversão de NO a N2 e de CO a CO2 sobre o suporte com maior conteúdo de titânia. Nos catalisadores de Fe2O3 puro, o vapor de água anulou completamente a atividade para a redução de NO a N2, mas manteve-se a conversão de CO a CO2. Os catalisadores de CuO e CuO-Fe2O3 sobre suporte contendo alto teor de zircônia apresentaram alto potencial para o abatimento de NOx na presença de vapor de água em temperaturas superiores a 500 ºC.
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Book chapters on the topic "ZrO2-TiO2"

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Lei, X. L., Dong Ming Zhang, and Lian Meng Zhang. "Preparation and Conductivity of TiO2-Doped Y2O3-Stabilized ZrO2 Ceramic." In Composite Materials V, 120–25. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-451-0.120.

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Melo, M. Fátima, and J. S. Moya. "Ageing Effect on Microstructural and Mechanical Properties of Mullite — ZrO2-TiO2 Composites." In Zirconia’88, 67–79. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1139-0_6.

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Figueiredo, M. O., and A. Correia Dos Santos. "Perovskite and Fluorite-Related Ternary Phases in the System CaO-ZrO2-TiO2." In Zirconia’88, 81–87. Dordrecht: Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-1139-0_7.

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Pettersson, Alf B. A., Hedvig Byman-Fagerholm, and Jarl B. Rosenholm. "Surface Acid-Base, and Electrokinetic Properties of Si3N4, ZrO2, Al2O3, Y2O3, and TiO2 Powders." In 4th International Symposium on Ceramic Materials and Components for Engines, 260–68. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2882-7_23.

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Torres-Rodríguez, M., L. López-Pérez, M. Gutiérrez-Arzaluz, and V. Mugica-Álvarez. "Sulfated TIO2–ZRO2 Membrane as Synthesized by Sol–Gel Method: Application in the Olefin Oligomerization." In Membranes, 33–40. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45315-6_4.

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Krejcikova, Simona, Kamila Koci, Lucie Obalova, Libor Capek, and Olga Solcova. "Preparation and Characterization of TiO2–ZrO2 Mixed Oxide Catalysts for Photocatalytic Reduction of Carbon Dioxide." In Chemistry for Sustainable Development, 389–98. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-90-481-8650-1_24.

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Borgaonkar, Avinash, and Ismail Syed. "Computational Analysis of Composite MoS2-TiO2-ZrO2 Soft Coating on Tribological Performance in Dry Sliding Contact." In Advanced Manufacturing Systems and Innovative Product Design, 533–40. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9853-1_44.

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Manríquez, M. E., T. López, D. H. Aguilar, and P. Quintana. "Phase Structure and Thermal Evolution in Mixed Oxide TiO2-ZrO2 Powders Obtained by the Sol-Gel Process." In Emerging Fields in Sol-Gel Science and Technology, 254–64. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4615-0449-8_28.

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Ajay Kumar, Vemulapalli, Penmetsa Rama Murty Raju, Nallu Ramanaiah, and Siriyala Rajesh. "The Effect of ZrO2 and TiO2 Reinforcing Agent on the Microstructure and Mechanical Properties of Hydroxyapatite Nanocomposites." In Advances in Applied Mechanical Engineering, 699–712. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-1201-8_76.

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Moreno, Jorge-Luis Flores, and François Figueras. "Acid properties of pure and sulfated mixed oxides of A12O3-TiO2 and Al2O3-ZrO2 prepared by sol-gel." In Emerging Fields in Sol-Gel Science and Technology, 265–74. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4615-0449-8_29.

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Conference papers on the topic "ZrO2-TiO2"

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Lim, Jae-Soon, Ki-Chul Kim, Kwang Hee Lee, Jae Hyoung Choi, Yong Suk Tak, Wan-Don Kim, Jin Yong Kim, et al. "Ru/TiO2/ZrO2/TiN (RIT-TiO2/ZrO2) Capacitor Structure for the 50nm DRAM Device and beyond." In 2007 International Conference on Solid State Devices and Materials. The Japan Society of Applied Physics, 2007. http://dx.doi.org/10.7567/ssdm.2007.j-7-1.

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Lari, A., A. Khodadadi, and Y. Mortazavi. "Temperature-independent TiO2-ZrO2 oxygen lambda sensor." In 2008 IEEE Sensors. IEEE, 2008. http://dx.doi.org/10.1109/icsens.2008.4716571.

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Padmanabhan, Revathy, Navakanta Bhat, Yuichiro Morozumi, S. Mohan, and Sanjeev Kaushal. "High-performance stacked TiO2-ZrO2 and Si-doped ZrO2 metal-insulator-metal capacitors." In 2014 IEEE International Conference on IC Design & Technology (ICICDT). IEEE, 2014. http://dx.doi.org/10.1109/icicdt.2014.6838596.

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Onanko, A. P., M. P. Kulish, O. V. Lyashenko, G. T. Prodayvoda, S. A. Vyzhva, and Y. A. Onanko. "Inelastic-elastic properties of SiO2, SiO2 + TiO2 + ZrO2." In 2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE). IEEE, 2012. http://dx.doi.org/10.1109/omee.2012.6464790.

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Sanu, M. S., Anoop Chandran, V. P. Prakashan, Gejo George, M. S. Sajna, P. R. Biju, Cyriac Joseph, and N. V. Unnikrishnan. "Synthesis and hydrophilic mechanism of porous TiO2-ZrO2 transparent coatings." In THE 3RD INTERNATIONAL CONFERENCE ON OPTOELECTRONIC AND NANO MATERIALS FOR ADVANCED TECHNOLOGY (icONMAT 2019). Author(s), 2019. http://dx.doi.org/10.1063/1.5093849.

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Pomilla, F. R., R. Molinari, E. I. Garcia-Lopez, G. Marci, and L. Palmisano. "Photocatalytic CO2 Valorization by Using TiO2, ZrO2 and Graphitic Based Semiconductors." In 2018 IEEE 4th International Forum on Research and Technology for Society and Industry (RTSI). IEEE, 2018. http://dx.doi.org/10.1109/rtsi.2018.8548363.

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Jiang, Feipeng, Ningyuan Duan, Hongtao Lin, Lan Li, Juejun Hu, Lei Bi, Haipeng Lu, Xiaolong Weng, Jianliang Xie, and Longjiang Deng. "ZrO2-TiO2 Thin Films and Resonators for Mid-Infrared Integrated Photonics." In 2014 IEEE Photonics Society Summer Topical Meeting Series. IEEE, 2014. http://dx.doi.org/10.1109/sum.2014.27.

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Zheng, Renrong, Zhen Wang, Na Wang, Zan Ding, and Haisheng San. "High-efficient Electrochemical Betavoltaic Cell Using ZrO2 Modified TiO2 Nanorod Arrays." In 2021 IEEE 16th International Conference on Nano/Micro Engineered and Molecular Systems (NEMS). IEEE, 2021. http://dx.doi.org/10.1109/nems51815.2021.9451276.

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Cheng-Hsing Hsu and Shih-Yao Lin. "Physical, electrical properties and reproducible resistance switching of ZrO2-TiO2 dielectric films." In 2010 IEEE 3rd International Nanoelectronics Conference (INEC). IEEE, 2010. http://dx.doi.org/10.1109/inec.2010.5424926.

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Avellaneda, Cesar O., Luis O. Bulhoes, and Agnieszka Pawlicka. "Preparation and characterization of lithium-doped and undoped CeO2-TiO2-ZrO2 films." In Symposium on Integrated Optoelectronics, edited by Bruce S. Dunn, Edward J. A. Pope, Helmut K. Schmidt, and Masayuki Yamane. SPIE, 2000. http://dx.doi.org/10.1117/12.384352.

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