Thematische Bibliographien / Perovskity / Dissertationen
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Dissertationen zum Thema „Perovskity“

Autor: Grafiati
Veröffentlicht am 4. Juni 2021
Zuletzt aktualisiert am 3. Februar 2022

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1

Strejček, Josef. "Studium syntézy a struktury keramických perovskitových materiálů pro energetické aplikace." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-229301.

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Method, so called “glycin- nitrate process”, combined with high temperature solid state reaction, of preparation multi- component ceramic perovskite materials was studied. Two types of perovskite systems were prepared by this method. Firs one, based on LaNiO3 doped by calcium and aluminium and second one, based on SmFeO3 doped by calcium and nickel or cobalt. This method made possible preparation of one phase perovskite or perovskites with few percent of nickel in form of oxide. In systems containing both nickel and calcium another phases rich in calcium and nickel appeared.
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Cihlář, Jaroslav. "Studium perovskitových oxidových katalyzátorů pro parciální oxidace metanu." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2011. http://www.nusl.cz/ntk/nusl-233339.

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Research was curried out on the perovskite systems with general formula A1-xA‘xB1-yB‘yO3± (where A=La, Sm, A´=Ca, B´=Al, B=Co,Fe,Mn and Cr). Perovskite oxides were sythesized by polymerisation methods and characterised by RTG analysis, BET method, SEM and EDX. TPD spectra and catalyst testing were measured in high temperature plug flow reactor and products were analysed by mass spectrometry. It was found, that metane oxidation at ratio O2/CH40,5 depended on the temperature. Total oxidation proceeded at the temperature betwen 300-700oC to the carbon dioxide and water, while the partial oxidatio
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Bartoníčková, Eva. "Syntéza a analýza kompozitních oxidových keramik v přítomnosti nekonvenčních energetických polí." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2010. http://www.nusl.cz/ntk/nusl-233312.

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Synthesis and bulk analysis of composite ceramic oxide materials and materials with perovskite-defect structure is presented within this work. Syntheses of these advanced ceramics materials were carroed out by using of nonconventional techniques (microwave-assisted hydrothermal synthesis and polycondensation techniques) and by conventional mechanochemical activation followed by high temperature solid state reaction. X-Ray difraction (XRD), Rietveld analysis, scaning microscopy (SEM), microalysis EDS-SEM, thermal analysis (TG), infrared spectroscopy (IR), determination of particles size and spe
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Gavranović, Stevan. "Monokrystaly perovskitů pro detekci elektromagnetického záření." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-445139.

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This thesis is focused on the study of the detection of electromagnetic radiation using monocrystalline perovskites. Theoretical part deals with basic principles of detections and possible applications of hybrid perovskite crystals in the field of ultraviolet and visible spectrum detection. Parameters of the recently published perovskite photodetectors are also presented. Experimental part describes synthesis, structural and optical properties of MAPbBr3 single crystals and electrical characterization of the Au/MAPbBr3/Au photodetector. Photodetector parameters (responsivity, external quantum
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5

Jančík, Procházková Anna. "Syntéza a studium nano-strukturovaných perovskitů pro aplikace v organické elektronice." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2020. http://www.nusl.cz/ntk/nusl-433268.

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Nanočástice perovskitů halogenidů kovů vykazují unikátní vlastnosti, především výjimečně vysoké hodnoty kvantových výtěžků fluorescence, které předurčují tyto materiály pro aplikace v optoelektronických a fotonických zařízeních. Tato práce popisuje přípravu nanočástic perovskitů halogenidů kovů pomocí stabilizačních činidel inspirovaných přírodou. Stabilizační činidla zde slouží nejen ke stabilizaci, ale i k modifikaci povrchu nanočástic za účelem zvýšení funkčnosti výsledných nanostruktur. Úvod práce popisuje optimalizaci přípravy nanočástic precipitační technikou za použití stabilizačních či
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Liška, Petr. "Optická charakterizace pokročilých nanomateriálů s vysokým laterálním rozlišením." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443725.

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Advanced nanomaterials show a significant improvement in certain physical or functional properties compared to conventional materials. Such advanced materials are, for example, lead halide perovskites (LHP). It is a group of hybrid organic-inorganic materials with a direct bandgap exhibiting unique optical properties. The high quantum efficiency of photoluminescence makes nanocrystals or thin films of LHP suitable candidates for the production of light-emitting diodes, solar cells and LCD displays. Their inexpensive and simple fabrication together with their unique optical properties makes LHP
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Dobeš, Jiří. "Studium přípravy a katalytické aktivity dopovaných ABO3 perovskitů pro syntézu vodíku." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2015. http://www.nusl.cz/ntk/nusl-217156.

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The Master´s thesis deals with the preparation of perovskite oxides by glycine synthesis with following characterization and analysis of catalytic activity. Especially is discussed crystallographic structure. In the theoretical part were first summarized the available information of the properties and usage of perovskite oxides. In the experimental part of the work was carried out the preparation of perovskite oxides and were made chemical analysis. Moreover a catalytic activity of selected perovskites has been studied and have been illustrated their crystal structure.
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Mlčkovová, Hana. "Studium dielektrických vlastností krystalů perovskitů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-445134.

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The presented diploma thesis deals with the preparation of perovskite single crystals by inverse thermal crystallization and subsequent study of the basic properties of these hybrid organic-inorganic materials that can be used in various optoelectronic (photodetectors, transistors, lasers, LEDs) or photovoltaic applications. Their behavior in the electric field was studied by impedance spectroscopy. Impedance and capacitance-voltage (C-V) characteristics (frequency dependences) were measured in the dark and in the light. From the impedance dependences for measurements at 0 V voltage in the dar
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Bufaiçal, Leandro Félix de Sousa. "Propriedades estruturais, eletrônicas e magnéticas dos óxidos Ca2-xLaxFelrO6, Sr2-xLaxFelrO6 e TbMnO3." [s.n.], 2010. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278527.

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Orientador: Pascoal José Giglio Pagliuso<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-08-15T19:42:04Z (GMT). No. of bitstreams: 1 Bufaical_LeandroFelixdeSousa_D.pdf: 2467040 bytes, checksum: 4460b75c04d570fb27584b7dfff2c5f3 (MD5) Previous issue date: 2010<br>Resumo: Há muitas décadas os óxidos de metais de transição são tema de grande interesse científico devido à grande variedade de propriedades físicas interessantes que apresentam, com suas possíveis aplicações tecnológicas. Mais recentemente, por exemplo, os
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Tanabe, Eurico Yuji. "\"Óxidos do tipo Perovskitas para reações de decomposição direta de NO e redução de NO com CO\"." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-16042007-111408/.

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Uma tecnologia importante para reduzir a quantidade de poluentes atmosféricos lançados na atmosfera, é a utilização de catalisadores, que convertem os gases altamente poluentes como o NO, para outros gases inofensivos ao meio ambiente. Neste trabalho, os óxidos do tipo perovskitas La2CuO4, LaNiO3, LaMnO3, La1,4Sr0,6CuO4, La0,7Sr0,3NiO3 e La0,7Sr0,3MnO3 foram preparados através do método da co-precipitação, caracterizados por difração de raios-X, redução a temperatura programada, fisissorção de nitrogênio e análise química, e, posteriormente avaliados frente as reações de redução de NO com CO,
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Lukose, Rasuole. "Liquid-delivery metal-organic chemical vapour deposition of perovskites and perovskite-like compounds." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2011. http://dx.doi.org/10.18452/16278.

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Perowskite und Perowskit-artige Materialien sind von großem Interesse, da sie eine Vielzahl von strukturellen und physikalischen Eigenschaften haben, welche die Möglichkeit bieten, sie für unterschiedliche Anwendungen einzusetzen. Die Methode der Liquid-Delivery Metal Organic Chemical Vapour Deposition (LD-MOCVD) wurde gewählt, da sie eine gute Kontrolle über die Zusammensetzung ternärer Oxide und eine hohe Homogenität der Filme ermöglicht. Darüber hinaus können mit dieser Methode Filme hergestellt werden, die aus Elementen bestehen, für welche nur feste Precursor oder welche mit niedrigem D
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Montero, Rama María Del Pilar. "TOWARD NANOSTRUCTURED PEROVSKITE SOLAR CELLS BASED ON NANOPOROUS ANODIC ALUMINA TECHNOLOGY." Doctoral thesis, Universitat Rovira i Virgili, 2020. http://hdl.handle.net/10803/670596.

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En aquesta tesi es planteja fabricar una cel·la solar nano-estructurada de perovskita utilitzant alúmina nano-porosa anoditzada (NAA en les seves sigles en anglès) com a suport. Es va escollir la perovskita perquè les cel·les solars d'aquest material han assolit una eficiència molt similar a les cel·les existents de silici. A més a més, són barates i fàcils de preparar. El fet que la cel·la estigui nano-estructurada aportarà estabilitat davant la radiació, la temperatura i la humitat, sent aquest el principal problema d'aquests dispositius. Els nano-porus de la NAA tenen una forma cilíndrica
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Francisco, López Adrian. "Understanding the temperature and pressure dependence of the optoelectronic and structural properties of FAxMA1-xPbI3 perovskite solid solutions." Doctoral thesis, Universitat Autònoma de Barcelona, 2020. http://hdl.handle.net/10803/670182.

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Les perovskita orgàniques/inorgàniques híbrides han atret molta atenció des que es van introduir per primera vegada en un dispositiu fotovoltaic fa deu anys, obtenint una eficiència de el 3%. Des de llavors, l’eficiència de les cel·les solars de perovskita ha augmentat fins a gairebé igualar l’eficiència de les cel·les fotovoltaiques comercials de silici. A més, permet la fabricació de dispositius flexibles a un preu reduït. A causa de les seves propietats optoelectròniques excepcionalment bones, també s’està duent a terme una intensa recerca per trobar diferents aplicacions d’aquest tipus de
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Silva, Gabriel Magalhães e. "Sí­ntese e propriedades de cerâmicas de LaxSr1-xCryFe1-y(Mn1-y)O3-δ para aplicações em célula de combustí­vel e catalisadores." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-19092018-155147/.

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O mundo moderno é extremamente dependente de combustíveis fósseis como fonte de energia primária e essa forte dependência leva a problemas políticos, econômicos e ambientais. Como possível solução a esses problemas tem-se as células combustíveis, pois são dispositivos que geram energia elétrica limpa diretamente de reações eletroquímicas produzindo, além da energia elétrica, apenas calor e água. Logo, percebe-se que essas células são fontes de energia confiáveis, renováveis e não poluentes, que contribuem para o desenvolvimento sustentável. Devido a isso, este trabalho teve como objetivo princ
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Watterud, Geir. "Determination of Oxygen Transport Coefficients in Perovskites and Perovskite related Materials with mixed Conductivity." Doctoral thesis, Norwegian University of Science and Technology, Department of Materials Technology, 2005. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-698.

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<p>Perovskites and perovskite related materials are materials that are candidates for applications such as oxygen permeable membranes, cathodes for SOFC and high-temperature oxygen sensors. This arises from the potential high ionic conductivity and the chemical stability even at low partial pressures of oxygen. From an application point of view, it is important to have knowledge about the oxygen transport properties in these materials. Oxygen transport in mixed conducting oxides involves two inherently different processes; oxygen exchange between bulk gas and surface and solid state diffusion.
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Bufaiçal, Leandro Félix de Sousa. "Investigação das propriedades estruturais, eletrônicas e magnéticas dos óxidos com estrutura perovskita dupla Ca2-xLaxFeIrO6." [s.n.], 2006. http://repositorio.unicamp.br/jspui/handle/REPOSIP/278507.

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Orientador: Pascoal Jose Giglio Pagliuso<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Fisica Gleb Wataghin<br>Made available in DSpace on 2018-08-10T19:13:39Z (GMT). No. of bitstreams: 1 Bufaical_LeandroFelixdeSousa_M.pdf: 1501359 bytes, checksum: 7c304c6377511ffd74495c952b919ec0 (MD5) Previous issue date: 2006<br>Resumo: Um grande número de óxidos de metais de transição se forma em estrutura perovskita simples ou em uma de suas variantes, e muitos deles apresentam propriedades físicas interessantes, como supercondutividade, magneto-resistência colossal e ferro
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Tanabe, Eurico Yuji. "Catalisadores de níquel e cobalto obtidos a partir de óxidos do tipo perovskita para reações de reforma a vapor de etanol." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/75/75131/tde-24032011-093816/.

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Neste trabalho foram avaliadas as atividades de catalisadores do tipo perovskita LaNi1-xCoxO3 frente à reação de reforma a vapor de etanol. Devido à baixa área superficial, característica de óxidos do tipo perovskita, esses foram suportados em SiO2, Al2O3 e ZrO2, a fim de verificar o efeito do suporte na atividade catalítica.<br /> Os catalisadores foram preparados pelo método da co-precipitação e caracterizados por espectrometria de emissão atômica por plasma induzido, difração de raios X pelo método do pó, adsorção de nitrogênio pelo método B.E.T, redução a temperatura programada e espectros
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Ribeiro, Guilherme Kubo. "Síntese e caracterização de materiais nanoestruturados luminescentes de composição CaTiO3:Pr,La,Al /." Rio Claro, 2019. http://hdl.handle.net/11449/183379.

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Orientador: Alexandre Mesquita<br>Resumo: O titanato de cálcio CaTiO3 é um material com estrutura de tipo perovskita que tem sido aplicado como luminóforo. É bem estabelecido que a inserção de íons de terra rara no sítio ocupado pelo Ca2+ provoca mudanças significativas nas suas propriedades estruturais e produz efeitos luminescentes na faixa do visível. Entretanto não existem trabalhos reportando a inserção do La3+ no sítio do Ca2+ no que se refere às características estruturais e luminescentes desses materiais. Portanto, o presente trabalho estuda as propriedades fotoluminescentes apresentad
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Fontes, José Fernando Dutra. "Estudo das propriedades magnéticas do LaCrO3 dopado com Sr e Mn." Universidade Federal de Sergipe, 2015. https://ri.ufs.br/handle/riufs/5374.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>Oxides with perovskite structure have been objects of intense study since their discovery in 1839 and are still being widely studied due to richness and diversity of physical properties present in these materials, including a wide range of important magnetic properties both from a scientific point of view as technological. It is known that the magnetic properties of these materials are very sensitive to the effects of substitution of chemical doping elements and their structure as well as the preparation method used to obta
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Diab, Hiba. "Propriétés optiques des pérovskites hybrides 3D pour le photovoltaique." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLN061/document.

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Depuis 5 ans, les pérovskites hybrides organiques-inorganiques sont apparues comme une nouvelle classe de semiconducteurs possédant des propriétés optoélectroniques très intéressantes pour les dispositifs photovoltaïques et émetteurs de lumière. Cette thèse porte sur une étude expérimentale de spectroscopie optique, qui s’inscrit dans le champ d’exploration des propriétés optiques et des effets excitoniques des pérovskites hybrides CH3NH3PbX3 avec X = I ou Br. Nous avons étudié les propriétés optiques de couches minces déposées par spin-coating et de monocristaux élaborés en solution. Les couc
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Knapp, Meghan C. "Investigations into the structure and properties of ordered perovskites, layered perovskites, and defect pyrochlores." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1149097068.

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Ortega, San Martin Luis. "Where is the xenon that is missing from the Earth's atmosphere?" Revista de Química, 2013. http://repositorio.pucp.edu.pe/index/handle/123456789/99511.

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El análisis químico de los meteoritos que más se parecen a la materia que dio lugar a la formación de la Tierra revela que la concentración del gas xenón en la atmósfera de nuestro planeta es menor de la que se debería esperar. Investigaciones recientes parecen indicar que el origen de esta deficiencia podría estar relacionado con la solubilidad de los gases nobles en las vacantes de oxígeno de la estructura perovskita del silicato de magnesio, MgSiO3, principal componente del manto terrestre.<br>The chemical analysis of the meteorites considered to resemble closely the primordial matter which
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Kaneko, Ulisses Ferreira 1984. "Sondando estruturas cristalinas e interações magnéticas em perovskitas com espectroscopia Raman." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/277669.

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Orientador: Eduardo Granado Monteiro da Silva<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-08-20T17:01:24Z (GMT). No. of bitstreams: 1 Kaneko_UlissesFerreira_M.pdf: 2619088 bytes, checksum: c36f7ad5b21c5415a6efa7e4b72e4bb3 (MD5) Previous issue date: 2012<br>Resumo: Essa dissertação de Mestrado descreve medidas de Espectroscopia Raman realizadas em dois sistemas de perovskitas, Sr2CrReO6 e Ba1-xLaxTi0,5Mn0,5O3. Na perovskita Sr2CrReO6 dupla foram feitas medidas em um intervalo de temperaturas entre 30 K e
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Rodrigues, João Elias Figueiredo Soares. "Ordenamento e propriedades dielétricas em microondas dos sistemas (Ba1-xSrx)3CaNb2O9 e (Ba1-yLay)3Ca1+yNb2-yO9." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-15092017-081825/.

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Materiais dielétricos para operação em microondas constituem um ponto importante para usos em sistemas de comunicação móvel/via satélite, incluindo sistemas de monitoramento terrestres, internet/telefonia para celulares, internet das coisas, além do interesse militar para elaboração de radares. Avanços importantes nesse setor tecnológico só foram outorgados, graças ao emprego ostensivo de ressoadores dielétricos (RDs). Esses dispositivos constituem cerâmicas óxidas com baixa perda dielétrica em microondas, com demanda para sua miniaturização. O sistema deverá possuir alta constante dielétrica
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Santos, Mayke Machado. "Estudo DFT para a interação das moléculas de CO e NO com perovskitas de LaFePdO3 dopadas com Mn, Co e Ni." Universidade do Estado do Rio de Janeiro, 2014. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=6719.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Recentemente, vem sendo desenvolvido o uso de catalisadores de metais preciosos suportados por óxidos do tipo perovskita em automóveis. Tais sistemas catalíticos são conhecidos como catalisadores Inteligentes. A tecnologia dos catalisadores inteligentes aponta para um novo futuro na catálise automotiva e surge como um promissor substituinte para os catalisadores convencionais. O entendimento dos principais fatores que levam a auto regeneração destes catalisadores é um passo fundamental no processo de evolução desta tecnologia. O me
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Wirthová, Michaela. "Reologické vlastnosti gelů pro Pechiniho syntézy." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2009. http://www.nusl.cz/ntk/nusl-216509.

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This work deals with preparation of layers of ceramic materials – perovskites. The introductory part includes general characteristics concerning structure, properties and use of this materials. In details then there is described method of their preparation, namely Pechini´s syntheses, which are most widely used. Optimum molar ratio of components is discussed, in the sense of what compositions lead to creation of perovskite structures. Influence of this parameter on rheological properties of precursory gels is described in the end of the first part of work. In experimental section there are des
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Ljungström, Elin, Ellen Hådén, Lukas Lekberg, and Nima Taherpour. "Design, synthesis and characterization of Dimethylammonium / Ethylammonium / Cesium Lead Halide Perovskites for optoelectronic applications." Thesis, KTH, Skolan för kemi, bioteknologi och hälsa (CBH), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-277109.

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The world is facing a climate crisis and to be able to solve it society needs to decrease the use of fossil fuels and find renewable alternatives. Solar energy is a great contender for a renewable energy source since it can be harvested for eternal time. One of the problems with the solar cells available today is that they are more expensive than fossil alternatives, and the process of making them still uses a lot of resources and energy. However, in the last decade an alternative has arisen; perovskite solar cells. Due to the fact that perovskite solar cell production uses less energy and res
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Křečková, Jitka. "Charakterizace materiálů pro perovskitové solární články impedančními metodami." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-413039.

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The Master‘s thesis deals with the topic of perovskite solar cells with the main focus on the materials used for the active layer. In the introductory part, the electrical and optical properties of halide perovskites are described and specific examples of perovskite crystals are introduced. The description of impedance and photoimpedance measurement methods used for characterization of perovskite solar cells is also included in the thesis. The measurement of electrochemical impedance spectroscopy was conducted on four perovskite crystals and equivalent circuit was formed to fit the obtained da
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Silva, Ana Regina de Queiroz. "Síntese e caracterização das perovskitas CaTiO3 e Ca1-x-yErxYbyTiO3." Universidade Federal do Maranhão, 2016. http://tedebc.ufma.br:8080/jspui/handle/tede/1342.

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Submitted by Rosivalda Pereira (mrs.pereira@ufma.br) on 2017-05-05T19:36:02Z No. of bitstreams: 1 AnaQueirozSilva.pdf: 6863169 bytes, checksum: e47ae4d9bb4d9f8cffde413e5eecd620 (MD5)<br>Made available in DSpace on 2017-05-05T19:36:02Z (GMT). No. of bitstreams: 1 AnaQueirozSilva.pdf: 6863169 bytes, checksum: e47ae4d9bb4d9f8cffde413e5eecd620 (MD5) Previous issue date: 2016-07-19<br>In recent years, research has increased in order to develop new materials processing methods have more advantages over conventional methods currently used which are quicker and cheaper. It has become common to u
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Barbosa, Rafael de Lima. "Propriedades dielétricas intrínsecas de perovskitas duplas RE2CoMnO6 (RE = íon terra-rara)." reponame:Repositório Institucional da UFC, 2017. http://www.repositorio.ufc.br/handle/riufc/25008.

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BARBOSA, R. de L. Propriedades dielétricas intrínsecas de perovskitas duplas RE2CoMnO6 (RE = íon terra-rara). 2017. 69 f. Dissertação (Mestrado em Física) – Centro de Ciências, Universidade Federal do Ceará, Fortaleza, 2017.<br>Submitted by Pós-Graduação em Física (posgrad@fisica.ufc.br) on 2017-08-23T16:49:17Z No. of bitstreams: 1 2017_dis_rlbarbosa.pdf: 2986314 bytes, checksum: fa8e3135695dd91e18a33451cfe520b7 (MD5)<br>Approved for entry into archive by Giordana Silva (giordana.nascimento@gmail.com) on 2017-08-23T18:16:47Z (GMT) No. of bitstreams: 1 2017_dis_rlbarbosa.pdf: 2986314 bytes,
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Karkuszová, Karina. "Příprava keramických materiálů pro piezoelektrické aplikace." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417056.

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The content of this thesis is about preparation and processing of lead-free piezoceramic materials with perovskite structure. Potassium sodium niobate (KNN) powder was prepared by solid state reaction (SSR) and liquid phase reaction (sol-gel reaction). The powders were formed by uniaxial and isostatic pressing and further sintered. The density, grain size and morphology were determined on the sintered samples. The powder, synthesised by SSR and sintered in a conventional furnace, was chosen as a standard. The maximum density achieved on samples after optimization of sintering cycle was 93 %TD.
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Silva, Filho José Maria Clemente da 1988. "Perovskita de iodeto de chumbo e metilamônio sintetizada com pontos quânticos de sulfeto de chumbo e filmes finos de sulfeto e iodeto de chumbo depositados por "sputtering"." [s.n.], 2017. http://repositorio.unicamp.br/jspui/handle/REPOSIP/330877.

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Orientador: Francisco das Chagas Marques<br>Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin<br>Made available in DSpace on 2018-09-03T02:41:17Z (GMT). No. of bitstreams: 1 SilvaFilho_JoseMariaClementeDa_D.pdf: 74812249 bytes, checksum: 2c3eb02d615d6ec43fdb5efb29cc187b (MD5) Previous issue date: 2017<br>Resumo: Perovskitas híbridas orgânica-inorgânica tem sido objeto de intensa investigação devido as suas atrativas propriedades ópticas e eletrônicas, por exemplo, banda de energia proibida direta, alto coeficiente de absorção e transporte ambipolar de ca
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Coutrim, Leandro Tolentino. "Propriedades estruturais, eletrônicas e magnéticas dos óxidos La2−xCaxCoIrO6." Universidade Federal de Goiás, 2015. http://repositorio.bc.ufg.br/tede/handle/tede/4574.

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Lee, Heejae. "Analysis of Current-Voltage Hysteresis and Ageing Characteristics for CH3NH3PbI3-xClxBased Perovskite Thin Film Solar Cells." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLX009/document.

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Les perovskites organiques-inorganiques en halogénures de plomb sont des matériaux très prometteurs pour la prochaine génération de cellules solaires avec des avantages intrinsèques tels que leur faible coût de fabrication (grande disponibilité des matériaux de base et leur mise en œuvre à basse température) et leur bon rendement de conversion photovoltaïque. Cependant, les cellules solaires pérovskites sont encore instables et montrent des effets d'hystérésis courant-tension délétères. Dans cette thèse, des résultats de l’analyse physique de couches minces de pérovskite a
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Tainter, Gregory Demaray. "Spatially resolved charge transport and recombination in metal-halide perovskite films and solar cells." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/286026.

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Metal-halide perovskites show great promise as solution-processable semiconductors for efficient solar cells and LEDs. In particular, the diffusion range of photogenerated carriers is unexpectedly long and the luminescence yield is remarkably high. While much effort has been made to improve device performance, the barriers to improving charge transport and recombination properties remain unidentified. I first explore charge transport by investigating a back-contact architecture for measurement. In collaboration with the Snaith group at Oxford, we develop a new architecture to isolate charge ca
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Čižauskaitė, Sigutė. "Perovskito struktūros aliuminatų ir kobaltatų sintezė zolių-gelių metodu." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2009~D_20091202_112220-21150.

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Šiame darbe vienfazis perovskito struktūros gadolinio aliuminatas GdAlO3 zolių-gelių metodu buvo gautas 1000 oC temperatūroje, gadolinio jonų šaltiniu naudojant Gd2O3, kompleksus sudarančiu reagentu – 1,2 etandiolį, natūralią vyno rūgštį, citrinų rūgštį arba citrinų rūgšties ir etanolamino mišinį. Sintetinant GdAlO3, gautų tyrimų rezultatai parodė, kaip yra svarbu zolių gelių procese pasirinkti tinkamas pradines medžiagas bei kompleksus su metalais sudarančius reagentus: gadolinio jonų šaltiniu naudojant Gd2O3 buvo gauti geresni rezultatai nei naudojant Gd(NO3)3•6H2O, vienfazis GdAlO3 gali būt
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Čižauskaitė, Sigutė. "Sol-gel synthesis of perovskite structure aluminates and cobaltates." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2009~D_20091202_112230-17664.

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In the present thesis the reported results let us to conclude that the developed aqueous sol–gel procedure could be successfully used for the low-temperature synthesis of monophasic perovskite gadolinium aluminate ceramics. It was also demonstrated that the selection of raw materials for the sol–gel processing should be done with care. Monophasic perovskite structure gadolinium aluminate GdAlO3 has been synthesized by sol gel synthesis method at 1000 oC, using gadolinium oxide as gadolinium raw material and 1.2 ethanediol, natural tartaric acid, citric acid or mixture of citric acid and ethano
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Jiménez, López Jesús. "Analysis of the Different Kinetic Processes in Perovskite Solar Cells." Doctoral thesis, Universitat Rovira i Virgili, 2019. http://hdl.handle.net/10803/668405.

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L'energia fotovoltaica s'ha convertit en una de les alternatives més populars com a font d'energia renovable. Es basa en la transformació directa de radiació solar en electricitat. Es troba disponible a escala global i a més no necessita de cap transformador per convertir l'energia mecànica en energia elèctrica, el que fa que sigui fàcil d'implementar. Avui en dia, el material més utilitzat per a aplicacions fotovoltaiques segueix sent el silici. En canvi, el desenvolupament de noves tecnologies, més barates, fàcils de processar i que a més poden utilitzar-se en substrats flexibles, ha sor
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AZEVEDO, Sérgio Alves de. "Óxidos cerâmicos a base de SrTiO3 e substituídos com Ferro/Prata – Caracterização Estrutural." Universidade Federal do Maranhão, 2015. http://tedebc.ufma.br:8080/jspui/handle/tede/1805.

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Submitted by Rosivalda Pereira (mrs.pereira@ufma.br) on 2017-08-10T15:19:49Z No. of bitstreams: 1 SergioAzevedo.pdf: 3063334 bytes, checksum: ac4355642257682013f550aad3b1a89a (MD5)<br>Made available in DSpace on 2017-08-10T15:19:49Z (GMT). No. of bitstreams: 1 SergioAzevedo.pdf: 3063334 bytes, checksum: ac4355642257682013f550aad3b1a89a (MD5) Previous issue date: 2015-07-09<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>Strontium titanate, SrTiO3 (ST) is a mixed oxide from the group of perovskites, has a cubic structure and a band gap of 3.2 eV. In this study system
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Garcia, Silmara Rodrigues. "Produção de hidrogênio por reforma a vapor e oxidativa do etanol utilizando óxidos do tipo perovskita." Universidade Federal de São Carlos, 2013. https://repositorio.ufscar.br/handle/ufscar/3940.

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Made available in DSpace on 2016-06-02T19:55:37Z (GMT). No. of bitstreams: 1 5636.pdf: 3745496 bytes, checksum: f5a3c6431b588da21fab339e8c763373 (MD5) Previous issue date: 2013-10-17<br>Universidade Federal de Sao Carlos<br>This paper assesses the catalytic activities of LaCoO3 perovskite towards the steam reforming oxidative reaction of ethanol . Due to the low surface area which is commonly found on perovskite-type oxides , these were supported onAl2O3 , ZrO2 and ZrO2-Al2O3. The unsupported catalysts were prepared by precipitation and citrate methods whilst the supported catalysts were pre
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Marinho, Rosa Maria de Medeiros. "Filtro Cerâmico - uso como suporte do SrSnO3: para aplicação em catálise." Universidade Federal da Paraí­ba, 2011. http://tede.biblioteca.ufpb.br:8080/handle/tede/5419.

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Made available in DSpace on 2015-05-08T15:00:08Z (GMT). No. of bitstreams: 1 arquivototal.pdf: 3204458 bytes, checksum: 4a8187024ec992f09e7022c618f46049 (MD5) Previous issue date: 2011-03-14<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPES<br>The present work consisted in the preparation of a ceramic filter, based on a reticulated porous ceramic, used as support for a catalyst with perovskite structure. The interest in these oxides is related to the easy modification of its catalytic properties, as a function of the adequate cation selection as well as to its high
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Bouich, Amal. "Study and Characterization of Hybrid Perovskites and Copper-Indium-Gallium Selenide thin films for Tandem Solar Cells." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/160621.

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[ES] El objetivo principal de esta tesis es contribuir al avance de nuevas técnicas de elaboración con bajo coste, utilizando materiales tipo de cobre, indio, galio y selenio CIGS y Perovskita para aplicaciones en energía solar fotovoltaica. CIGS parecen ser adecuadas ya que son de bajo costo de producción y se han reportado eficiencias de conversión del 23,35%. Por otro lado, las perovskitas híbridas de haluros de plomo orgánicos-inorgánicos han aparecido como nuevos materiales excepcionales para celdas solares, especialmente porque la eficiencia de las celdas solares basadas en perovskita ha
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Henek, Tomáš. "Charakterizace vlastností perovskitovských fotovoltaických článků." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-376942.

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This work studies the subject of perovskite solar cells. The structure of perovskites is described along with a portion of photovoltaics history that led to the employment of perovskites as absorpsion layers. Further, methods of measurement for solar cells such as impedance spectroscopy, photospectroscopy and load characteristics are summarized. Lastly there is a description of already done analytics of perovskite solar cells with the summary of the results. In the practical part, there are measurements made to find out any effect of cell topology or light source wavelength on the cell perform
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Husťák, Miroslav. "Vysoce porézní keramické oxidové materiály pro environmentální katalýzu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-449796.

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As far as the replacement of fossil fuels with more environmentally friendly options is concerned, hydrogen is considered as the most promising source of energy. Currently, hydrogen is mainly produced through the method of methane reforming. This method requires the utilisation of catalysts made of precious metals. This master's degree thesis therefore investigates perovskite materials SmCoO3, Sm0,8Ca0,2CoO2,9, SmCo0,8Al0,2O3 and Sm0,8Ca0,2Co0,8Al0,2O2,9, which could be utilised as catalysts in the production of hydrogen by methane reforming. Methane reformation occurs on the surface of a cata
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Malibert, Charlotte. "Ordre et desordre dans la perovskite ferroelectrique relaxeur pbsc 1 / 2nb 1 / 2o 3 comparaison avec quelques perovskites simples et complexes." Paris 6, 1998. http://www.theses.fr/1998PA066703.

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Nous avons synthetise et etudie la structure de composes perovskites ferroelectriques pbsc 1 / 2nb 1 / 2o 3, caracterisees par differents degres d'ordre sc/nb et par une stchiometrie differente sur le site du pb. Ces composes sont appeles relaxeurs : leur constante dielectrique est elevee avec une forte valeur sur une gamme de temperatures importante et presente un phenomene de dispersion en frequence. L'etude de l'ordre des cations sc/nb sur le site b par diffraction des rx et des neutrons est mise en relation avec les proprietes dielectriques : il existe toujours un ordre local a courte port
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Gelmetti, Ilario. "Advanced Characterization and Modelling of Charge Transfer in Perovskite Solar Cells." Doctoral thesis, Universitat Rovira i Virgili, 2019. http://hdl.handle.net/10803/668085.

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Aquesta tesis inclou el treball fet en ICIQ sobre fabricació, caracterització, i modelització de cel·les solars de perovskita híbrida. Agafades des de la recerca en altres tipus de cel·les solars, les eines de anàlisi, les metodologies i, més important, la seva interpretació han sigut analitzades i adaptades a aquest nou tipus de dispositiu. Llavors, aquestes tècniques han sigut utilitzades per analitzar i entendre la influència de quatre diferents i nous transportadors de forats electrònics sobre el voltatge de cel·les de perovskita. Un altre estudi ha investigat la acumulació dels elec
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Pelissari, Pedro Ivo Batistel Galiote Brossi. "Síntese e caracterização de filmes finos SrTi1-xFexO3 nanoestruturados aplicados como sensor de gás ozônio." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-17082012-110437/.

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Neste trabalho, foram desenvolvidos filmes finos de composição SrTi1-xFexO3 (0,00&le; x &le;0,150) nanoestruturados visando sua aplicação como sensor de gás ozônio. Os filmes finos foram depositados através da técnica de deposição por feixe de elétrons (EBD) cujo alvo utilizado foram pastilhas obtidas a partir do pó cristalino SrTi1-xFexO3 (0,00&le; x &le;0,150) sintetizadas através do método dos precursores poliméricos. Foi observado a partir das analises termogravimétrica e térmica diferencial que a incorporação de ferro no sistema diminui a temperatura de queima do pó precursor, sugerindo q
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Macêdo, Junior Wagner Costa. "Hidrotermalização assistida por micro-ondas seguida de tratamento térmico : uma nova rota para obtenção do CaZrO3 /." Presidente Prudente, 2020. http://hdl.handle.net/11449/192716.

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Orientador: Silvio Rainho Teixeira<br>Resumo: Cerâmica com estrutura do tipo perovskita e minério recentemente descoberto, o CaZrO3 se aplica, com destaque, em componentes de circuito para sensores de oxigênio, hidrogênio e umidade, além de poder ser utilizado na adsorção de corantes, como material abrasivo, refratário e como matriz em sólidos fósforos dopados com Eu3+. Devido a este leque de aplicações, torna-se imprescindível o estudo de novos métodos de síntese visando a obtenção deste material, principalmente em escala nanométrica. O método Hidrotermal Assistido por Micro-ondas (HAM) é um
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Lukoše, Rasuolė [Verfasser], Erhard [Akademischer Betreuer] Kemnitz, Roberto [Akademischer Betreuer] Fornari, and Anjana [Akademischer Betreuer] Devi. "Liquid-delivery metal-organic chemical vapour deposition of perovskites and perovskite-like compounds / Rasuole Lukose. Gutachter: Erhard Kemnitz ; Roberto Fornari ; Anjana Devi." Berlin : Humboldt Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2011. http://d-nb.info/1015016723/34.

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Ahchawarattaworn, Jutharat. "Perovskite oxynitride dielectrics." Thesis, University of Newcastle Upon Tyne, 2011. http://hdl.handle.net/10443/1186.

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The synthesis, crystal structures and dielectric properties of perovskite oxynitrides of the type LnTiO2N (Ln = La, Nd and mixtures) and ATaO2N (A = Ca, Sr, Ba and mixtures), have been investigated. The end-member oxynitrides and their associated LaxNd1-xTiO2N, CaxSr1-xTaO2N and BaxSr1-xTaO2N solid solutions were successfully prepared by ammonolysis of the appropriate precursor oxides at temperatures in the range 900-1200ºC. The complete range of LaxNd1-xTiO2N solid solution are orthorhombic perovskites, which show a small increase in unit cell parameters with increasing La content across the
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