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Dissertations / Theses on the topic 'Oxigen vacancy'

Author: Grafiati

Published: 13 July 2024

Last updated: 31 July 2025

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1

Quach, Vien-Duong. "TiO₂-based nanostructures for photocatalytic H₂ production and CO₂ reduction." Electronic Thesis or Diss., université Paris-Saclay, 2024. http://www.theses.fr/2024UPASF026.

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De nombreuses études ont été consacrées à l'amélioration de la stabilité et à la modulation des propriétés électroniques des nanoparticules métalliques pendant les réactions catalytiques grâce à l'encapsulation d'oxydes réductibles par l'intermédiaire de ce qu'on appelle l'interaction forte métal-support (SMSI). Il existe une forte demande de méthodes universelles pour induire le SMSI dans des conditions ambiantes, plutôt que par un traitement thermique extrême, et pour concevoir différentes nanostructures de type SMSI. Dans cette étude doctorale, nous avons d'abord conçu des nanostructures cœ

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2

Luo, Kun. "Cation ordered and anion-vacancy ordered perovskite materials." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:f36a3f97-70b1-4ab6-819b-d400341a4558.

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The investigation in this thesis focuses on the synthesis of cation-ordered perovskite phases by introducing anion vacancies into the structure. Complex cation-ordered phases Ba2YMO5 and Ba3YM2O7.5 (M = Fe, Co) have been synthesized using ceramic or citrate gel methods under flowing argon. Close inspection reveals that the structures are constructed from Y2M2O102 basic units which consist of two YO6 octahedra and two MO4 tetrahedra in a rock-salt type arrangement. In the structure of Ba2YMO5 (M = Fe, Co), the neighbouring Y2M2O102 units are connected with an equivalent one in the yz-plane wi

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3

THANNEERU, RANJITH. "VACANCY ENGINEERED DOPED AND UNDOPED NANOCRYSTALLINE RARE EARTH OXIDE PARTICLES FOR HIGH TEMPERATURE OXIDATION RESISTANT COATING." Master's thesis, University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3986.

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Rare earth oxides with trivalent lattice dopants have been of great interest to researchers in the recent years due to its potential applications in catalysis and high temperature protective coatings. The ability to store oxygen in rare earths is the basis for catalysis because of the ability to change valence states which causes the presence of intrinsic oxygen vacancies in the crystal lattice. Although, several doped-rare earth oxide systems in micron scale have been investigated, the doping effect in cerium oxide nanoparticles with well characterized particle size has not been studied. The

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4

Iwata, Tatsuya. "Study on Resistive Switching Phenomenon in Metal Oxides for Nonvolatile Memory." 京都大学 (Kyoto University), 2014. http://hdl.handle.net/2433/188598.

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5

Nishi, Yusuke. "Nonpolar Resistive Switching Based on Quantized Conductance in Transition Metal Oxides." Kyoto University, 2019. http://hdl.handle.net/2433/242544.

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6

Maiti, Debtanu. "Defect Laden Metal Oxides and Oxynitrides for Sustainable Low Temperature Carbon Dioxide Conversion to Fuel Feedstocks." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7694.

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The current energy and environmental scenario in the world demands acute attention on sustainable repurposing of waste CO2 to high value hydrocarbons that not only addresses the CO2 mitigation problem, but also provides pathways for a closed loop synthetic carbon cycle. Difference in the scales of global CO2 emissions (about 40 Gtpa, 2017) and the carbon capture and sequestration (CCS) facilities (estimated cumulative 40 Mtpa, 2018) provokes active research on this topic. Solar thermochemical (STC) and visible light photocatalysis are two of the most promising routes that have garnered attenti

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7

Peng, Yung-Kang. "Surface mapping of faceted metal oxides by chemical probe-assisted NMR for catalytic applications." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:7b56021f-71fb-437b-8c6b-0569705ef68e.

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Semiconductive metal oxides are of great importance in environmental remediation and electronics because of their ability to generate charge carriers when excited with appropriate energy. The electronic structure, light absorption and charge transport properties have made the transition metal oxides an attractive material as photocatalyst. Recently, facet-engineering by morphology control has been intensively studied as an efficient approach to further enhance their photocatalytic performance. However, various processing steps and post-treatments used in the preparation of facet-engineered par

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8

Shojaee, Kambiz. "Fundamental aspects of ammonia oxidation on cobalt oxide catalysts." Thesis, The University of Sydney, 2014. http://hdl.handle.net/2123/13657.

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The current thesis deals with the ammonia oxidation on cobalt oxide catalyst at the molecular level. The catalytic oxidation of ammonia to NO is crucial in the industrial process of nitric acid production. Cobalt oxide catalysts are being used together with platinum gauzes to reduce the production cost and emission of greenhouse gas N2O. However, the fundamentals of ammonia oxidation on cobalt oxides are not known. This thesis aims to provide insights into our fundamental understanding of ammonia oxidation on Co3O4 surfaces. The performance of cobalt oxide catalysts in the oxidation of NH3 str

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9

Stokes, Stephen J. "Atomistic modelling studies of fluorite- and perovskite-based oxide materials." Thesis, University of Bath, 2010. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.527142.

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Fast oxide-ion and proton conductors are the subject of considerable research due to their technological applications in sensors, ceramic membranes and solid oxide fuel cells (SOFCs). This thesis describes the use of computer modelling techniques to study point defects, dopants and clustering effects in fluorite-and perovskitetype ion conductors with potential SOFC applications. Bi2O3 related phases are being developed with the objective of high oxide-ion conductivities at lower operating temperatures than 1000°C, as in current generation SOFC electrolytes. Doped Bi2O3 phases have shown promis

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10

Umeda, Yuji. "Rational design of dielectric oxide materials through first-principles calculations and machine-learning technique." Doctoral thesis, Kyoto University, 2020. http://hdl.handle.net/2433/245844.

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京都大学<br>0048<br>新制・課程博士<br>博士(工学)<br>甲第22159号<br>工博第4663号<br>新制||工||1727(附属図書館)<br>京都大学大学院工学研究科材料工学専攻<br>(主査)教授田中功, 教授中村裕之, 教授邑瀬邦明<br>学位規則第4条第1項該当<br>Doctor of Philosophy (Engineering)<br>Kyoto University<br>DFAM

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11

Agarwal, Sahil. "Defect Studies In Metals, Alloys, and Oxides By Positron Annihilation Spectroscopy and Related Techniques." Bowling Green State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1626713209028374.

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12

Kang, Yuhong. "Mechanisms, Conditions and Applications of Filament Formation and Rupture in Resistive Memories." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/77593.

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Resistive random access memory (RRAM), based on a two-terminal resistive switching device with a switching element sandwiched between two electrodes, has been an attractive candidate to replace flash memory owing to its simple structure, excellent scaling potential, low power consumption, high switching speed, and good retention and endurance properties. However, due to the current limited understanding of the device mechanism, RRAMs research are still facing several issues and challenges including instability of operation parameters, the relatively high reset current, the limited retention an

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13

Ali, Fawad. "Investigation of metal oxides thin films developed by PVD system for perovskite solar cells." Thesis, Queensland University of Technology, 2019. https://eprints.qut.edu.au/127139/1/Fawad_Ali_Thesis.pdf.

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This research presents thin film deposition and characterization of metal oxides using industrially viable Physical Vapour Deposition (PVD) techniques. The research examines low temperature processed electron and hole transport metal oxides for high performance and stable perovskite solar cells. The physical, chemical, optical and electronic properties of the films were investigated and their device performance has been evaluated. The performance of the device improved and the materials cost reduced by replacing the expansive organic materials with more stable inorganic metal oxides.

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14

Girdauskaite, Egle. "Thermodynamische und kinetische Untersuchungen zum Sauerstoffaustausch in perowskitischen Mischoxiden auf Basis von Ferriten und Cobaltiten." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2007. http://nbn-resolving.de/urn:nbn:de:swb:14-1195658113234-25483.

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Oxidkeramische Materialien sind zunehmend von praktischem Interesse für neue Technologien, die in Brennstoffzellen, Sensoren und Ionentransport-Membranen Anwendung finden. Einige dieser Oxide mit Perowskitstruktur ABO3 zeigen hohe Ionen- und Elektronenleitung, ausreichende chemische Stabilität sowie thermisch-mechanische Eigenschaften, wie sie für die Anwendung als Sauerstofftransportmembran benötigt werden. Oxidionentransport erfolgt über einen Oxidionen-Leerstellenmechanismus. Die charakteristische Schwierigkeit für die Anwendung solcher Materialien besteht aber darin, dass die gestellten Fo

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15

He, Chenwei. "Experimental study of the interaction of vacancy defects with Y, O and Ti solutes to better understand their roles in the nanoparticles formation in ODS steels." Thesis, Orléans, 2014. http://www.theses.fr/2014ORLE2057/document.

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Les conditions sévères de fonctionnement des réacteurs du futur, Génération-IV, -haute température et fortes irradiations-nécessitent le développement de matériaux adaptés. Les aciers ODS (Oxide Dispersion Strengthened) sont des candidats très compétitifs pour le gainage du combustible en raison de leurs excellentes propriétés de gonflement et de fluage. Ces atouts majeurs sont induits par la fine dispersion de nanoparticules d’oxydes (Y, O, Ti) obtenue par co-broyage de poudres de la matrice et d’oxyde dont les conditions sont à optimiser pour maitriser la distribution en taille et compositio

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16

Yousefian, Pedram. "Pore Formation in Aluminum Castings: Theoretical Calculations and the Extrinsic Effect of Entrained Surface Oxide Films." UNF Digital Commons, 2017. https://digitalcommons.unf.edu/etd/761.

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Aluminum alloy castings are being integrated increasingly into automotive and aerospace assemblies due to their extraordinary properties, especially high strength-to-density ratio. To produce high quality castings, it is necessary to understand the mechanisms of the formation of defects, specifically pores and inclusion, in aluminum. There have been numerous studies on pore formation during solidification which lead to hot tearing and/or reduction in mechanical properties. However, a comprehensive study that correlates pore formation theory with in situ observations and modeling assumptions fr

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17

Li, Hongfei. "Density functional simulations of defect behavior in oxides for applications in MOSFET and resistive memory." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/274924.

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Defects in the functional oxides play an important role in electronic devices like metal oxide semiconductor field effect transistors (MOSFETs) and resistive random-access memories (ReRAMs). The continuous scaling of CMOS has brought the Si MOSFET to its physical technology limit and the replacement of Si channel with Ge channel is required. However, the performance of Ge MOSFETs suffers from Ge/oxide interface quality and reliability problems, which originates from the charge traps and defect states in the oxide or at the Ge/oxide interface. The sub-oxide layers composed of GeII states at the

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18

SARTORETTI, ENRICO. "Doped ceria nanostructures for the oxidation of pollutants: investigations into the role of defect sites." Doctoral thesis, Politecnico di Torino, 2021. http://hdl.handle.net/11583/2910076.

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19

Guttman, Jeremy. "Polymer-based Tunnel Diodes Fabricated using Ultra-thin, ALD Deposited, Interfacial Films." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469125487.

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20

Vitoux, Laura. "Etude électrochimique et structurale du système NaxMoO2." Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0362/document.

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Ce travail de thèse présente l’étude du diagramme de phase des oxydes lamellaires NaxMoO2dans le cadre de la recherche de nouveaux matériaux. L’identification des transitionsstructurales au cours de l’intercalation et désintercalation électrochimique du sodium dans lesdomaines de composition ½ ≤ x ≤ 1 et ¼ < x ≤ ½ a été faite par électrochimie combinée à ladiffraction des rayons X in situ. Il a été montré que le profil très accidenté de la courbegalvanostatique résulte de multiples réarrangements structuraux au cours du cyclage.Notamment l’existence de nombreuses phases NaxMoO2 particulière

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21

Er-Rakho, Lahcen. "Oxydes de cuivre a valence mixte : perovskites deficitaires en oxygene." Caen, 1987. http://www.theses.fr/1987CAEN2036.

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Mise en evidence et etude de deux grandes familles de composes dans le systeme la::(2)o::(3)-ao-cuo(a=ca,ba,sr) : la::(2-x)ba::(1-x)cu::(1-x/2)o::(5-x)(ln=la,nd) ou cu est essentiellement au degre d'oxydation 2 et une seconde famille caracterisee par la valence mixte du cuivre, les quantites de cuivre 3 pouvant atteindre dans certains cas 40%. Tous ces oxydes ont en commum leur appartenance a la structure perovskite. Proprietes electriques et magnetiques

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22

Karapetrova, Euguenia. "Factors influencing the crystallization, phase and oxygen vacancy concentration in zirconia." Thesis, 1997. http://hdl.handle.net/1957/34055.

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In order to achieve a better understanding of the processes that occur during formation and sintering of zirconia, various chemical and physical techniques were used. Along with Perturbation Angular Correlation spectroscopy, that allowed us to investigate microscopic properties inside the nanometer-size zirconia grains, such techniques as Scanning Electron Microscopy and X-ray diffraction were used for determining the size of particles before and after sintering, and Neutron Activation Analysis was employed for measuring the impurity levels in zirconia powders. By controlling the initial condi

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23

Lin, Yu-shiang, and 林裕翔. "The oxygen vacancy and spin polarization of cuprous oxide nanoparticle." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/50981798243992667228.

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碩士<br>國立中央大學<br>物理研究所<br>95<br>In studying the magnetic properties of cuprous oxide nanoparticle. We got a group of M-H curve measurements of cuprous oxide nanoparticle and discovered hysteresis at 1.8 K and 5 K. Then we pressed the cuprous oxide sample to control the interparticle separation, and dicussed the effect of interparticle interaction. The range of compacting density (CD) of particles is from 3 % to 77 % . There are two magnetic components in cuprous oxide nanoparticle system. We infer that one component is surface spin polarization and the other is magnetic characters of Cu2O0.

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24

Huang, Cheng-Yen, and 黃丞言. "Studies of Oxygen Vacancy Defects and Magnetism in Co-Doped Cerium Oxide Nanoparticles." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/45604922345335992055.

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25

Lee, Sangheon 1978. "First principles-based atomistic modeling of the structural properties of silicon-oxide nanomaterials." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-08-1963.

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We have developed continuous random network (CRN) model based Metropolis Monte Carlo simulation tools which are capable of predicting the structural properties of amorphous semiconductor and oxide materials as well as their interface. To bolster the reliability of the CRN model, we have developed force fields based on gradient corrected density functional theory (DFT) calculations. Our in-house CRN-MMC tools have been massively parallelized, which allows us to create fairly large model structures within a reasonable computational time. Using the integrated CRN-MMC tools, we have elucidated the

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26

Yu, Shen-Wei, and 俞勝為. "Evaluation for Oxygen Vacancy on Co-Ce-Y Composite Oxides and Steam Reforming of Ethanol." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/78827177806809738326.

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碩士<br>國防大學理工學院<br>化學工程碩士班<br>102<br>The effect of accessible oxygen on the steam reforming of ethanol (SRE) over Co3O4-CeO2 and Co3O4-CeO2-Y2O3 catalysts was investigated. Both equal molar ratio of Co3O4-CeO2 catalysts were prepared by hydrothermal co-precipitation (H) and hydrothermal ultrasonic-assisted co-precipitation (UH) methods, and finally the UH method was applied to prepare 2.5, 5, and 10 wt % of yttrium-doped Co3O4-CeO2 catalysts, respectively. All catalysts were characterized through X-ray diffraction (XRD), temperature programmed reduction/temperature programmed oxidation (TPR/TPO

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27

Jiu-XingHuang and 黃久倖. "Influence of oxygen vacancy reservoirs on resistive switching characteristics of oxide based resistance switching memories." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/33367771155989874222.

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28

Roh, Bumwook Macdonald Digby D. "Defect properties of anodic oxide films on titanium and impact of oxygen vacancy on oxygen electrode reactions." 2007. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-1878/index.html.

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29

McCrate, Joseph Michael. "Characterization of low density oxide surface sites using fluorescent probes." 2013. http://hdl.handle.net/2152/23078.

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Low density surface sites are believed to play an important role in processes occurring on oxide surfaces, including catalysis and particle and film nucleation. However, our understanding of the role and chemical nature of such sites play in these processes is limited by the inability to experimentally detect minority surface sites in many oxide systems. The research performed for this dissertation is focused on developing a surface science technique utilizing fluorescent molecules to titrate specific surface sites on planar fused silica surfaces in an ultra-high vacuum (UHV) environment. High

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30

Lin, YungHsun, and 林詠勛. "Construction of the Carrier Concentration(Oxygen-Vacancy and Cation-Substitution) Separation Model & Metal Doping Effect on the Carrier Concentration in Conductive Oxides." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/02238829690685739233.

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博士<br>國立中央大學<br>化學工程與材料工程研究所<br>99<br>In this thesis, we would propose a method which can decouple and estimate the oxygen-vacancy concentration and the cation-substitution concentration in an extrinsic metal oxide thin film separately. Also, we further propose how the properties of the dopant affect the cation-substitution reaction and the oxygen-vacancy concentration by observing the annealing ambient effects. In chapter 3, we propose the method which could estimate the oxygen-vacancy concentration and the cation-substitution concentration by measuring the carrier concentration of the thin

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