Academic literature on the topic 'LaFeO₃'

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

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'LaFeO₃.'

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

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

Journal articles on the topic "LaFeO₃"

1

Manseki, Kazuhiro, Amelia Amir, and Takashi Sugiura. "Creation of a perovskite LaFeO3 network as photoelectrode material using a salicylate-ligating lanthanum–iron complex precursor." CrystEngComm 20, no. 41 (2018): 6382–86. http://dx.doi.org/10.1039/c8ce01291a.

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

Sharma, Neeru, Himmat Singh Kushwaha, S. K. Sharma, and K. Sachdev. "Fabrication of LaFeO3 and rGO-LaFeO3 microspheres based gas sensors for detection of NO2 and CO." RSC Advances 10, no. 3 (2020): 1297–308. http://dx.doi.org/10.1039/c9ra09460a.

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

Kim, Hong Ki, Hyeong Seop Kang, P. Santhoshkumar, Jae Woo Park, Chang Won Ho, Gyu Sang Sim, and Chang Woo Lee. "Surface modification of Ni-rich LiNi0.8Co0.1Mn0.1O2 with perovskite LaFeO3 for high voltage cathode materials." RSC Advances 11, no. 35 (2021): 21685–94. http://dx.doi.org/10.1039/d1ra00857a.

Full text
Abstract:
LaFeO3-coated NCM811 electrode materials are fabricated by a simple wet chemical synthesis technique. The 0.5 wt% LaFeO3-coated NCM811 cathode material shows higher cycling stability when compared to the bare NCM811.
APA, Harvard, Vancouver, ISO, and other styles
4

Gaikwad, Vishwajit M., and Smita A. Acharya. "Novel perovskite–spinel composite approach to enhance the magnetization of LaFeO3." RSC Advances 5, no. 19 (2015): 14366–73. http://dx.doi.org/10.1039/c4ra11619d.

Full text
Abstract:
In the present work, the perovskite–spinel interface effect on the bulk magnetic behavior of lanthanum ferrite (LaFeO3) based composite systems is under investigation in view of the enhancement of the magnetization of LaFeO3.
APA, Harvard, Vancouver, ISO, and other styles
5

Yang, Jun, Ruisheng Hu, Wanwan Meng, and Yanfei Du. "A novel p-LaFeO3/n-Ag3PO4 heterojunction photocatalyst for phenol degradation under visible light irradiation." Chemical Communications 52, no. 12 (2016): 2620–23. http://dx.doi.org/10.1039/c5cc09222a.

Full text
Abstract:
A novel p-LaFeO3/n-Ag3PO4 heterojunction photocatalyst exhibits higher activity than individual Ag3PO4 and LaFeO3 in the degradation of phenol.
APA, Harvard, Vancouver, ISO, and other styles
6

Selvadurai A., Paul Blessington, Tuzhi Xiong, Peng Huang, Qirong Tan, Yongchao Huang, Hao Yang, and M. Sadeeq (Jie Tang) Balogun. "Tailoring the cationic and anionic sites of LaFeO3-based perovskite generates multiple vacancies for efficient water oxidation." Journal of Materials Chemistry A 9, no. 31 (2021): 16906–16. http://dx.doi.org/10.1039/d1ta03604a.

Full text
Abstract:
A simple strategy involving Cr and Mo tailoring and post-reduction process to generate multivacancies in LaFeO3 is reported, which substantially accelerates the OER electroactivity of LaFeO3 with overpotential of 263 mV at 10 mA cm−2.
APA, Harvard, Vancouver, ISO, and other styles
7

Farhadi, Saeed, Mostafa M. Amini, and Farzaneh Mahmoudi. "Phosphotungstic acid supported on aminosilica functionalized perovskite-type LaFeO3 nanoparticles: a novel recyclable and excellent visible-light photocatalyst." RSC Advances 6, no. 105 (2016): 102984–96. http://dx.doi.org/10.1039/c6ra24627c.

Full text
Abstract:
In this research, a novel nanohybrid compound, LaFeO3@SiO2–NH2/PTA has been prepared, in which H3PW12O40 (abbreviated as PTA) was successfully anchored onto the surface of 3-aminopropylsilica modified LaFeO3.
APA, Harvard, Vancouver, ISO, and other styles
8

Boateng, Isaac W., Richard Tia, Evans Adei, Nelson Y. Dzade, C. Richard A. Catlow, and Nora H. de Leeuw. "A DFT+U investigation of hydrogen adsorption on the LaFeO3(010) surface." Physical Chemistry Chemical Physics 19, no. 10 (2017): 7399–409. http://dx.doi.org/10.1039/c6cp08698e.

Full text
Abstract:
Lanthanum ferrite (LaFeO3) is a technologically important electrode material for nickel–metal hydride batteries, energy storage and catalysis. In the present study, we have employed spin-polarized density functional theory calculations, with the Hubbard U correction (DFT+U), to unravel the adsorption mechanism of H2 on the LaFeO3(010) surface.
APA, Harvard, Vancouver, ISO, and other styles
9

Yu, Qing, Xianguang Meng, Tao Wang, Peng Li, Lequan Liu, Kun Chang, Guigao Liu, and Jinhua Ye. "A highly durable p-LaFeO3/n-Fe2O3 photocell for effective water splitting under visible light." Chemical Communications 51, no. 17 (2015): 3630–33. http://dx.doi.org/10.1039/c4cc09240f.

Full text
Abstract:
A new p-type photocathode LaFeO3 was successfully fabricated, and a stable (120 h) and effective water splitting (H2: 11.5 μmol h−1, O2: 5.7 μmol h−1) was realized via construction of a p-LaFeO3/n-Fe2O3 photocell.
APA, Harvard, Vancouver, ISO, and other styles
10

Zhong, Huixian, Jiaming Wang, Kang An, Kegong Fang, and Yuan Liu. "Nanoparticles of Rh confined and tailored by LaFeO3–La2O3 on SiO2 for direct ethanol synthesis from syngas." Catalysis Science & Technology 9, no. 13 (2019): 3454–68. http://dx.doi.org/10.1039/c9cy00416e.

Full text
Abstract:
A catalyst with a novel composition for direct ethanol synthesis from syngas was prepared and investigated in this work, which is Rh nanoparticles (NPs) highly dispersed on La2O3 modified LaFeO3, and the Rh NPs/La2O3–LaFeO3 was loaded on SiO2 with high surface area.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "LaFeO₃"

1

Guigoz, Vincent. "Photocatalyseurs hétérostructurés LaFeO₃/g-C₃N₄ pour la production d’hydrogène." Electronic Thesis or Diss., Université de Lorraine, 2020. https://docnum.univ-lorraine.fr/ulprive/DDOC_T_2020_0148_GUIGOZ.pdf.

Full text
Abstract:
L’hydrogène est un vecteur énergétique d’avenir en remplacement des hydrocarbures fossiles, à condition d’avoir une production majoritairement décarbonée. L’une des solutions les plus prometteuses pour générer l’hydrogène propre et durable est la décomposition photochimique de l’eau à partir de l’énergie solaire. Dans ce contexte, cette thèse porte sur l’élaboration et l’optimisation d’un photocatalyseur stable et composé d’éléments abondants. LaFeO₃ est un matériau pérovskite semi-conducteur présentant une excellente stabilité chimique et qui absorbe une large part visible du spectre solaire, mais ses propriétés photocatalytiques sont limitées par un faible transport des électrons. Pour améliorer son activité, une hétérostructure associant LaFeO₃ à g-C₃N₄ a été formée. g-C₃N₄ est un semi-conducteur organique 2D avec des propriétés optiques, structurelles et électroniques exceptionnelles. Leur association a permis d’augmenter significativement l’activité photocatalytique par une amélioration de la séparation et du transfert des porteurs de charge. Deux méthodes de production de H₂ ont été étudiées : par photocatalyse (PC) et photoélectrocatalyse (PEC). Les photoélectrodes du dispositif PEC ont été élaborées par pulvérisation cathodique magnétron et les nanoparticules dispersées en solution du dispositif PC ont été synthétisées par voie sol-gel. L’insertion d’une couche de g-C₃N4, déposée par spin-coating, sous le film de LaFeO₃ a permis pour la première fois de former cette hétérojonction en films minces, tandis que l’association par sonication des particules de LaFeO₃ et g-C₃N₄ a permis la création de l’hétérojonction en photocatalyseurs dispersés. L’influence de la composition des photoélectrodes a également été étudiée dans le cas de films non-stœchiométriques et par insertion d’éléments métalliques additionnels
Hydrogen is a promising energy carrier for replacing fossil fuels, under the conduction of having a mainly low carbon production. One of the most promising solution to generate clean and durable hydrogen is water splitting from solar energy. This manuscript focuses on the development and optimization of an abundant and stable photocatalyst. LaFeO₃ is a perovskite semi-conductor material showing and excellent chemical stability and that absorbs a large part in the visible spectra, although a low electron transfer limits its photocatalytic properties. To improve its activity, a heterostructure associating LaFeO₃ with g-C₃N₄ was realised. g-C₃N₄ is an organic semi-conductor with outstanding optical, structural, and electronic properties. Their association led to a significant increase in the photocatalytic activity by an increase in the separation and transfer of charge carriers. Two methods for H₂ production were studied: photocalysis (PC) and photoelectrocatalysis (PEC). Photoelectrodes of PEC dispositive were elaborated by magnetron sputtering and nanoparticles dispersed in solution of PC dispositive were synthesised using sol-gel. The insertion of a layer of g-C₃N₄, deposited by spin coating, below the LaFeO₃ films allowed for the first time to prepare this heterojunction using thin films, while the sonication of particles of LaFeO₃ and g-C₃N₄ allowed creating a heterojunction of dispersed photocatalysts. The impact of the composition of photoelectrodes was also studied for non-stoichiometric films and by inserting additional metallic elements
APA, Harvard, Vancouver, ISO, and other styles
2

Palcut, Marián. "Cation diffusion in LaMnO3, LaCoO3 and LaFeO3 materials." Doctoral thesis, Norwegian University of Science and Technology, Department of Materials Technology, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1819.

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

Reksten, Anita. "Hydrothermal Synthesis of LaFeO3." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-16321.

Full text
Abstract:
This work explores the hydrothermal synthesis of LaFeO3 (LFO) nanorods with a high aspect ratio. Synthesis of rod shaped LFO is a stepping stone to the synthesis of strontium doped LFO (LSF) nanorods with high aspect ratio. These LSF rods can be used to structure and increase the area of dense LSF oxygen permeable membranes, which can be applied in the partial oxidation of methane for the production of synthesis gas. Obtaining a larger surface area can increase the oxygen transport through the membrane when the transport is limited by surface exchange reactions. Increasing the oxygen transport is the objective of the work. LFO was attempted synthesised by a direct and a two-step synthesis. Product morphology and phase composition have been explored by the use of SEM and XRD. In the direct synthesis the effect of potassium hydroxide concentration, molar ratio of iron to lanthanum and synthesis duration were varied to investigate the effect of these parameters. LFO was not produced in the direct synthesis; the products consisted of La(OH)3 and Fe2O3. Since LFO was not obtained, a calculation exploring the temperature where LFO become more stable than La(OH)3 and Fe2O3 was performed. The calculations show that the transition temperature where LFO is thermodynamically favoured is close to the operating synthesis temperature. The small driving force for formation of LFO at a temperature close to the transition temperature is the reason why LFO have not formed in the direct syntheses.The two-step method consists of hydrothermal synthesis of La(OH)3 nanorods, which were covered by iron nitrate solution and attempted converted into LFO by a topochemical reaction. In the study performed, the rod structure is lost when the product is calcined at 400 ºC. LFO is not observed formed at this temperature, and LFO nanorods were therefore not obtained in the two-step synthesis.
APA, Harvard, Vancouver, ISO, and other styles
4

Gutierrez, Gabriel Dozzi. "Percival Lafer - projeto e industrialização no Brasil." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/16/16134/tde-16012019-155117/.

Full text
Abstract:
O texto que segue apresenta, em perspectiva, a trajetória de atuação de Percival Lafer - designer e industrial brasileiro. Apesar de ter ficado à sombra da historiografia, o designer contribuiu enormemente para a formação do que podemos considerar hoje o mobiliário nacional, dentro do âmbito comum das definições sobre design ligado à produção industrial. A pesquisa lança bases para novos pensamentos acerca do modernismo e sua duração no tempo, bem como sobre a atuação de profissionais da arquitetura e desenho industrial durante os anos da ditadura militar brasileira. Delineia-se assim, um período da historiografia do design que pode ser considerado transitório - salto das bases produtivas artesanais ao movimento desgovernado da industrialização nacional. A organização de um panorama iconográfico, detalhadamente comentado, enseja delinear o processo de criação de Lafer e sua relação com outras instâncias de atuação. A reflexão sobre a especificidade da linguagem projetual voltada à indústria coloca frente a frente a concepção de Percival Lafer às demais tentativas, ainda atuais, de organização de um desenho propriamente industrial e moderno. Por último, apresentamos impressões sobre a falência do movimento moderno no Brasil e sua persistência discursiva frente as urgências e necessidade de um país que exige outra lógica de ordenação do mundo material.
The following text presents, under perspective, the work trajectory of Percival Lafer, brazilian designer and industrial. Despite having remained in the shadows of historiography, the designer have enormously contribute to the formation of what we today consider the \"national furniture\", within the scope of conceptual definitions about the design related to industrial production. The research lays foundations to new considerations regarding modernism and its endurance over time, as well as to the role of architecture and industrial design professionals during the years of the brazilian military dictatorship. It is therefore outlined a period of the design historiography that might be considered transitory, a moment of leap from the primary productive basis towards the unbridled movement of our national industrialization. The organization of a iconographic panorama, commented in details, aspire to outline the creative process of Lafer and its bonds with other instances of work. The reflexion about the specificity of a project language turned to the industry, confronts Percival Lafer conceptions to the other attempts, still very current, of organization of a design properly modern and industrial. At last, we present impressions over the failure of the modern movement in Brazil and its discursive persistence front the urgencies and needs of a country that demands a different logic of organization of the material world.
APA, Harvard, Vancouver, ISO, and other styles
5

Palcut, Marián. "Cation diffusion in LaMnO3, LaCoO3 and LaFeO3 materials." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for materialteknologi, 2007. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1819.

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

Soares, Auta Narjara de Brito. "Síntese e caracterização de Ni/LaFeO3 nanoestruturados para a oxidação parcial do metano." Universidade de São Paulo, 2018. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-05022019-091239/.

Full text
Abstract:
Perovskita de LaFeO3 sintetizadas pelo método de Pechini foram avaliadas como catalisadores para a reação de oxidação parcial do metano. Foi impregnado níquel por via úmida como fase ativa em concentrações de 15 e 30 %, sobre as perovskitas, 15NLF e 30NLF, respectivamente, e o seu efeito foi avaliado para a mesma reação. Foi realizado análises termogravimétricas (TGA/DTGA) nos precursores da perovskitas, constatando a sua formação a 650 °C. A análise de microscopia de varredura (MEV) foi realizada nas amostras da perovskita pura, sendo que em uma delas foi realizada um banho de ultrassom para diminuir o tamanho de suas partículas e avaliar este efeito na reação de POM. Análises de difração de raio X (DRX) mostraram que todas as amostras apresentam as mesmas propriedades cristalográficas, sendo que, nas amostras contendo níquel, o metal apresentou-se na forma de NiO. O tamanho dos cristais, cálculado através da equação de Scherer, foi na ordem de 20 nm. Este resultado apontou que o níquel impregnado não participa da estrutura perovskita, mas sim está sobreposto a esta. Através da microscopia eletrônica de transmissão (TEM) foi possível visualizar a dispersão da fase ativa na superfície óxida e tamanhos de partículas na ordem de 20 nm. A redução a temperatura programada (TPR) apresentou as temperaturas de redução de espécies níquel e de ferro, presente na perovskita, e permitiu compreender a atuação das espécies Ni+2 e Fe0 na formação de H2 e CO. Os testes catalíticos foram realizados a 700ºC e 750°C, a pressão atmosférica, para uma vazão de alimentação de 200 cm3.min-1. Os testes cataliticos mostraram que a conversão de H2 dobrou para perovskita Ni/LaFeO3 em relação a LaFeO3. O catalisador 15NLF apresentou melhor estabilidade que o catalisador 30NLF para a reação.
LaFeO3 perovskite synthesized by the Pechini method were evaluated for the partial oxidation reaction of methane. Nickel was impregnated as the active phase in concentrations of 15 and 30%, on perovskites, 15NLF and 30NLF, respectively, and its effect was evaluated for the same reaction. Thermogravimetric analyzes (TGA / DTGA) were carried out on the perovskite precursors, confirming their formation at 650 °C. Scanning microscopy (SEM) was performed on pure perovskite samples, in one of them an ultrasonic bath was performed to reduce the size of its particles and to evaluate this effect in the POM reaction. X-ray diffraction (XRD) analyzes showed that all samples had the same crystallographic properties, and in the samples containing nickel, the metal was present as NiO. The size of the crystals, calculated through the Scherer equation, was in the order of 20 nm. This result pointed out that the impregnated nickel does not participate in the perovskite structure. Through transmission electron microscopy (TEM) it was possible to visualize the dispersion of the active phase on the oxide surface and particle sizes in the order of 20 nm. The programmed temperature reduction (TPR) showed the iron and nickel species reduction temperatures present in the perovskite, and allowed to understand the Ni+ 2 and Fe0 species in the H2 and CO formation. The catalytic tests were performed at 700 °C and 750 °C at atmospheric pressure for a flow rate of 200 cm3.min-1. The catalytic tests showed that the conversion of H2 doubled to perovskite Ni/LaFeO3 in relation to LaFeO3. 15NLF catalyst presented better stability than the 30NLF catalyst for the reaction.
APA, Harvard, Vancouver, ISO, and other styles
7

Blanck, Dimitri. "Modélisation de la structure et de la réactivité de la pérovskite LaFeO3 dopée." Thesis, Lille 1, 2016. http://www.theses.fr/2016LIL10166/document.

Full text
Abstract:
La dépollution des gaz d’échappement des véhicules essence est opérée par catalyse trois voies (CTV). Ce terme désigne la combinaison de trois réactions : l’oxydation du CO en CO2, la combustion des hydrocarbures imbrûlés et la réduction des NOx. Les catalyseurs 3-voies actuels sont constitués de nanoparticules de métaux nobles (Pt, Rh, Pd…) dispersés sur un support oxyde. En raison de leur prix élevés de nombreuse recherche vise à limiter leur utilisation. Utilisées depuis le milieu des années 70 en catalyse en tant que support, les pérovskites sont une alternative possible. Dans le cas de la catalyse trois voies, les capacités oxydo-réductrices intrinsèques du fer font de la pérovskite LaFeO3 (LFO) un candidat intéressant pour la réduction des NOx et l’oxydation du CO. A ce jour, les mécanismes réactionnels de même que les sites actifs de ce catalyseur sont inconnus. Il est donc important de les mettre en évidence pour permettre une amélioration rationnelle des activités et sélectivités des catalyseurs 3 voies de nouvelle génération. Dans cette étude nous avons cherché à déterminer le mécanisme réactionnel sur la pérovskite. Dans un premier nous avons cherché à étudier l’état de surface de la pérovskite en présence d’eau et déterminer les surfaces présentes. Puis nous avons calculé la thermochimie d’un ensemble de réaction élémentaire sur les surfaces pour enfin proposé un mécanisme réactionnel possible de réduction de NO et d’oxydation de CO. Après détermination des états de transition nous avons cherché à optimiser la formulation de la pérovskite en dopant les surfaces en métaux de transition
Pollution control of exhaust gases from gasoline vehicles is operated by three-way catalysis (TWC). This term refers to the combination of three reactions: the oxidation of CO to CO2, the combustion of unburned hydrocarbons and NOx reduction. Actually three-way catalysts are made of noble metal nanoparticles (Pt, Rh, Pd ...) deposed on an oxide support. Due to their high and fluctuating price numerous study are trying to limit their use. One possibility are perovskites which are used since the mid-70s in catalysis as support. These materials have also been a recent revival of interest as a carrier or as the active phase to the extent that their structural properties reduce the amounts of noble metals by limiting the aggregation of the metal nanoparticles. In the case of three-way catalysis, the redox intrinsic iron capabilities make the perovskite LaFeO3 (LFO) an interesting candidate for the reduction of NOx and oxidation of CO. To date, the reaction mechanisms, as well as the active sites of the catalyst are unknown. It is important to highlight them for rational improvement activities and selectivity of the catalysts 3 new generation pathways. In this study we sought to determine the reaction mechanism on perovskite. At first we tried to study the surface condition of the perovskite in the presence of water and determine these surfaces. Then we calculated the thermochemistry of a set of elementary reaction on surfaces to finally proposed possible reaction mechanism of NO reduction and CO oxidation. After determining transition states we sought to optimize the formulation of the perovskite by doping transition metal surfaces
APA, Harvard, Vancouver, ISO, and other styles
8

Ramos, Kethlinn. "Síntese e caracterização de LaFe1-xNixO3-δpara utilização como cátodo em células a combustível." UNIVERSIDADE ESTADUAL DE PONTA GROSSA, 2014. http://tede2.uepg.br/jspui/handle/prefix/1450.

Full text
Abstract:
Made available in DSpace on 2017-07-21T20:42:45Z (GMT). No. of bitstreams: 1 Kethlinn Ramos.pdf: 3306187 bytes, checksum: 9ad9682e26dbce661bb2882e6aee6988 (MD5) Previous issue date: 2014-01-30
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
The fuel cell are an alternative of production clean and efficient energy, because converts chemical energy in electrical energy. A fuel cell is formed basically by an electrolyte, a cathode and an anode. The fuel fed the anode and the oxidant fed the cathode. The fuel cells are classified according to the electrolyte used. The solid oxide fuel cell (SOFC) has all the components in solid state and work in high temperatures. The main electrolyte used for SOFC manufacturing is the ZrO2-Y2O3 owing your high ionic conductivity. The materials for electrode manufacturing must possess thermal expansion characteristics close to electrolyte and have high electrical conductivity in operating temperature, besides chemical and mechanical stability during operate and manufacture. High accomplishment cathodes have been studied, highlighting those with mixed conductivity, most ceramics with perovskite structure and lanthanide ions in your composition. Among these oxides, the perovskite LaFe1-xNixO3-δ has attracted interest for application as cathode in SOFC’s, to operate at intermediate temperatures. Chemical methods of production of ceramic powders are very efficient for obtaining powders with high reactivity and chemical homogeneity. Among the methods of chemical synthesis used to obtain powders, the Pechini method has pointed as a promising alternative process for obtaining nanometric powders. This work aimed to obtain LaFe1-xNixO3-δ powders by Pechini method, studying their behavior when changed processing conditions. The samples were synthetized, calcined and sintered. The characterizations accomplished were thermogravimetric analysis, differential thermal analysis, infrared spectroscopy, x-ray diffraction, scanning energy microscopy, spectroscopy dispersive energy, helium picnometry, surface area measured by BET method, density, porosity and water absorption by Arquimedes method, impedance spectropy and mercury porosimetry.Based on the characterizations performed, the LaFe1-xNixO3-δ obtained by the method based on the Pechini method proved viable for a possible application as cathode fuel cell solid oxide.
As células a combustível são uma alternativa à produção de energia elétrica limpa e eficiente, pois convertem energia química em energia elétrica. Uma célula a combustível é composta basicamente por um eletrólito, um cátodo e um ânodo. O combustível alimenta o ânodo e o oxidante alimenta o cátodo. As células a combustível são classificadas de acordo com o eletrólito utilizado. A célula a combustível de óxido sólido (CaCOS) tem todos seus componentes no estado sólido e opera em altas temperaturas. O principal eletrólito utilizado para a fabricação de uma CaCOS é o ZrO2-Y2O3 devido a alta condutividade iônica. Os materiais para a fabricação dos eletrodos devem possuir características de dilatação térmica próximas a do eletrólito e possuírem alta condutividade elétrica na temperatura de operação, além de estabilidade química e mecânica durante a operação e fabricação. Cátodos de alto desempenho vêm sendo estudados, chamando a atenção aqueles com condutividade mista, em sua maioria cerâmicos com estrutura perovisquita e com íons lantanídeo em sua composição. Entre esses óxidos, a perovisquita LaFe1-xNixO3-d tem atraído o interesse para a aplicação como cátodo nas CaCOSs, para operar em temperaturas intermediárias. Os métodos químicos de obtenção de pós cerâmicos são muito eficientes para a obtenção de pós com alta reatividade e homogeneidade química. Dentre os métodos de síntese química utilizados para a obtenção de pós, o método Pechini tem se destacado como um processo alternativo e promissor para a obtenção de pós nanométricos. Este trabalho teve como objetivo obter pós de LaFe1-xNixO3-d por meio do método Pechini, estudando seu comportamento quando alteradas condições de processamento. As amostras foram sintetizadas, calcinadas e sinterizadas. As caracterizações realizadas foram análise termogravimétrica, análise térmica diferencial, espectrometria no infravermelho, difração de raios x, microscopia eletrônica de varredura, espectrometria de energia dispersiva, picnometria a hélio, medida de área superficial pelo método BET, medidas de densidade, porosidade e absorção de água pelo método de Arquimedes, espectroscopia de impedância e porosimetria de mercúrio. Com base nas caracterizações realizadas o LaFe1-xNixO3-d obtido pelo método baseado no método Pechini, mostrou-se viável para uma possível aplicação como cátodo de células a combustível de óxido sólido.
APA, Harvard, Vancouver, ISO, and other styles
9

Gomes, Caius Vinicius de Oliveira. "A transição incompleta: Horácio Lafer e a defesa do liberalismo na Constituinte de 1946." Universidade Federal de Goiás, 2008. http://repositorio.bc.ufg.br/tede/handle/tede/4144.

Full text
Abstract:
Submitted by Erika Demachki (erikademachki@gmail.com) on 2015-02-12T19:44:06Z No. of bitstreams: 2 Dissertação - Caius Vinicius de Oliveira Gomes - 2008.pdf: 648449 bytes, checksum: f2813c6bc2685a1f1a470ee1bd5e5ada (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)
Approved for entry into archive by Erika Demachki (erikademachki@gmail.com) on 2015-02-12T19:45:26Z (GMT) No. of bitstreams: 2 Dissertação - Caius Vinicius de Oliveira Gomes - 2008.pdf: 648449 bytes, checksum: f2813c6bc2685a1f1a470ee1bd5e5ada (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)
Made available in DSpace on 2015-02-12T19:45:26Z (GMT). No. of bitstreams: 2 Dissertação - Caius Vinicius de Oliveira Gomes - 2008.pdf: 648449 bytes, checksum: f2813c6bc2685a1f1a470ee1bd5e5ada (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2008-10-30
The present paperwork aims at looking over the political debate at the 1946 constituent, from the view of the economical crisis figured by the end of the war and the consequent finish of the New State Dictatorship, aiming at understanding the impasses and dilemmas faced by the political actors upon the necessity of reorganization of the institutional frame concerning the economic policy. The liberal though was facing the hard task of redefining the huge presence of the State in the Brazilian economy e society. The debate upon the development of the industry was a guidance axle of the disputes observed in the Constituent. The study is based on Horacio’s Lafer ideas, considering him as a link between the two political experiences. The analysis of the parties, especially of the position taken upon the differences faced in the process of democracy rebuilding, was seen with attention by following the chancing process and continuation which characterized President Dutra’s administration.
O presente trabalho tem por finalidade refletir sobre o debate político na constituinte de 1946, a partir do quadro de crise econômica configurado pelo fim da guerra e o conseqüente derrocada da Ditadura Estadonovista, visando compreender os impasses e dilemas enfrentados pelos atores políticos diante da necessidade de reordenação do quadro institucional no que diz respeito à política econômica. O pensamento liberal estava diante da complexa tarefa de redefinir a enorme presença do Estado na economia e na sociedade brasileira. O debate em torno do desenvolvimento da indústria foi um dos eixos das contendas observadas em meio a Constituinte. O estudo se deteve no pensamento de Horácio Lafer, entendendo-o como uma ponte entre as duas experiências políticas. A análise dos partidos, em especial da posição assumida diante dos impasses enfrentados no processo de reconstrução democrática, foi objeto de nossa atenção ao acompanhar o processo de mudanças e continuidades que caracterizaram o governo do presidente Dutra.
APA, Harvard, Vancouver, ISO, and other styles
10

Haye, Émile. "Substitutions anioniques et cationiques de films minces d'orthoferrite de lanthane LaFeO3 élaborés par pulvérisation cathodique magnétron." Thesis, Université de Lorraine, 2016. http://www.theses.fr/2016LORR0094/document.

Full text
Abstract:
Les travaux de thèse ont porté sur la substitution cationique et anionique du composé LaFeO3, élaboré en couche mince par pulvérisation cathodique magnétron réactive (deux cibles métalliques et mélange gazeux Ar+O2). La première partie de la thèse est consacrée à la substitution du lanthane par d'autres terres rares plus petites : Praséodyme, Néodyme et Samarium. Les quatre pérovskites LaFeO3, PrFeO3, NdFeO3 et SmFeO3 ont donc été synthétisées et caractérisées (caractérisations optiques, électriques et structurales), et l'influence de la substitution sur les propriétés physiques est discutée. Les travaux ont montré que la substitution du lanthane par d’autres terres rares plus petites entraîne une modification des propriétés, que nous pouvons directement relier à la distorsion de la maille. Dans une deuxième partie, le dopage à l’azote du composé LaFeO3 a été réalisé, en utilisant de l'azote en tant que gaz réactif (deux cibles + mélange gazeux Ar+O2+N2). Les conditions de dépôt ont été étudiées dans le but d'optimiser la synthèse. A partir de mesures in situ des paramètres de la cible en fonction des débits de gaz, associées aux mesures post dépôt (composition, épaisseur, conductivité électrique), des conditions particulières de synthèse ont été retenues, afin d’optimiser le dopage à l’azote. L’utilisation de ces conditions de synthèses spécifiques ont permis la réalisation de plusieurs dépôts LaFeO3-xNx qui ont ensuite été caractérisés (caractérisations chimiques, optiques, électriques et structurales). Il en résulte que le dopage à l’azote du composé LaFeO3 entraîne une modification du gap de la pérovskite, ainsi que des propriétés électrique, et optique, malgré une faible teneur en azote
The work done trough this PhD deals with cationic and anionic substitution of LaFeO3 thin films deposited by reactive magnetron sputtering (co-sputtering of two targets in Ar+O2 mixture). The first part of the word is devoted to substitution of lanthanum by smaller rare earth, Praseodymium, Neodymium, and Samarium. The four perovskites LaFeO3, PrFeO3, NdFeO3 and SmFeO3 have been synthesized and characterized (optical, electrical and structural properties), and this cationic substitution is discussed. It results in a shift of the properties which can be directly linked with lattice distortion due to smaller rare earth. In a second part, nitrogen doping of LaFeO3 has been studied, by using nitrogen as reactive gas (co-sputtering of two targets in Ar+O2+N2 mixture). Deposition conditions have been studied in order to optimize the perovskite synthesis. From in situ measurements of target voltage variation with flow rate associated to post-deposition measurement (thickness, composition, electrical conductivity), specified conditions have been found for nitrogen doping optimization. Different LaFeO3-xNx thin films have been deposited following these specified conditions, and characterized (chemical, optical, electrical and structural analysis). Nitrogen doping of LaFeO3 leads to bandgap decrease, associated to modification of optical and electrical properties, even if a small amount of nitrogen can be added to the structure
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "LaFeO₃"

1

Mario, Moreno. Marión de Lafé. Quito, Ecuador: Instituto de Arte Moderno Libre Ecuatoriano-Argentino, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

Horácio Lafer: Democracia, desenvolvimento e política externa. Brasília, DF: Fundação Alexandre de Gusmão, Instituto de Pesquisa de Relações Internacionais, Comissão Organizadora do Centenário de Nascimento de JK, 2002.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Lafer, Johann. Desserts die mein Leben begleiten / Johann Lafer ; [Redaktion, Tanja Schindler ; Fotos, Michael Wissing]. Niedernhausen: Falken, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Rengo, Seifu Kankei Hojin Rodo Kumiai. LAFGO (Labor Federation of Government Related Organizations): It's [sic] structure, profile and members. Tokyo: LAFGO, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Idaho mountains, our home: The life story of Lafe and Emma Cox. Yellow Pine, Idaho: V.O. Ranch Books, 1997.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Government, California Legislature Senate Committee on Local. LAFCO governance issues & new cities' revenue neutrality: An interim hearing of the Senate Local Government Committee. Sacramento, CA: Senate Publications, 1998.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

California. Legislature. Senate. Committee on Local Government. LAFCO spheres of influence after 20 years: The summary report of the interim hearing of the Senate Committee on Local Government. Sacramento, CA (1100 J St., B-10, Sacramento 95814): Senate Publications, 1991.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Grinover, Ada Pellegrini, Celso Lafer, and Luiz Olavo Baptista. Novos caminhos do direito no século XXI: Direito internacional, filosofia jurídica e política, dogmática jurídica e direitos fundamentais : uma homenagem a Celso Lafer. Curitiba: Juruá Editora, 2012.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Lafer, Johann. Kochen mit Johann Lafer. Bassermann, 2003.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Horácio Lafer: Democracia, desenvolvimento e política externa. Brasília, DF: Fundação Alexandre de Gusmão, 2002.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "LaFeO₃"

1

Zhang, Zhou, Hui Ming Ji, Yan Fei Gu, Xiao Dong Chen, and Dao Yin Yu. "Preparation and Acetone Sensitive Characteristics of Pure and Cu2+-Doped LaFeO3 Semiconductor Thin Films." In Key Engineering Materials, 684–87. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-410-3.684.

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

Fujii, Tatsuo, Ikkoh Matsusue, Makoto Nakanishi, and Jun Takada. "Formation and superparamagnetic behaviors of LaFeO3 nanoparticles." In ICAME 2011, 245–48. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-4762-3_39.

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

Wiik, Kjell, Anita Fossdal, Lise Sagdahl, Hilde L. Lein, Mohan Menon, Sonia Faaland, Ivar Wærnhus, Nina Orlovskaya, Mari-Ann Einarsrud, and Tor Grande. "LaFeO3 and LaCoO3 Based Perovskites: Preparation and Properties of Dense Oxygen Permeable Membranes." In Mixed Ionic Electronic Conducting Perovskites for Advanced Energy Systems, 75–85. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2349-1_6.

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

Jaouali, Imen, Noomen Moussa, Mohamed Faouzi Nsib, Miguel Angel Centeno, and Ammar Houas. "Synthesis, Characterization, and Application in Liquid Phase Organic Oxidation of LaFe1-xCoxO3 Nanoparticles." In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions (2nd Edition), 429–34. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-51210-1_68.

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

Berry, Frank J., Xiaolin Ren, J. Ramón Gancedo, and José F. Marco. "57Fe Mössbauer Spectroscopy Study of LaFe1−x Co x O3 (x = 0 and 0.5) Formed by Mechanical Milling." In ICAME 2003, 335–40. Dordrecht: Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2852-6_51.

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

"(19595) Lafer-Sousa [2.56, 0.05, 1.8]." In Dictionary of Minor Planet Names, 140. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/978-3-540-34361-5_1571.

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

Barresi, A. A., D. Mazza, S. Ronchetti, R. Spinicci, and M. Vallino. "Non-stoichiometry and catalytic activity in ABO3 perovskites: LaMnO3 and LaFeO3." In Studies in Surface Science and Catalysis, 1223–28. Elsevier, 2000. http://dx.doi.org/10.1016/s0167-2991(00)80366-3.

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

Bianco Prevot, Alessandra, D. Fabbri, E. Bernardini, F. Deganello, Maria Laura Tummino, and Giuliana Magnacca. "Insights on the photocatalytic performances of LaFeO3 synthesized by solution combustion synthesis." In Materials Science in Photocatalysis, 357–70. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-821859-4.00023-4.

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

Grassi, Patrícia, Fernanda Caroline Drumm, Siara Silvestri, Sérgio Luiz Jahn, and Edson Luiz Foletto. "DEGRADAÇÃO DE CORANTES ALIMENTÍCIOS UTILIZANDO LAFEO3 COMO CATALISADOR EM REAÇÃO FOTO-FENTON SOLAR." In Impactos das Tecnologias na Engenharia Química 3, 272–80. Atena Editora, 2019. http://dx.doi.org/10.22533/at.ed.31919010431.

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

Fujii, Tatsuo, Ikko Matsusue, and Jun Tak. "Superparamagnetic Behaviour and Induced Ferrimagnetism of LaFeO3 Nanoparticles Prepared by a Hot-Soap Technique." In Advanced Aspects of Spectroscopy. InTech, 2012. http://dx.doi.org/10.5772/50031.

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

Conference papers on the topic "LaFeO₃"

1

Kaushik, S. D., S. Rayaprol, P. D. Babu, and V. Siruguri. "Exchange bias in ball-milled LaFeO[sub 3]." In SOLID STATE PHYSICS: PROCEEDINGS OF THE 57TH DAE SOLID STATE PHYSICS SYMPOSIUM 2012. AIP, 2013. http://dx.doi.org/10.1063/1.4791462.

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

Gaikwad, V. M., and S. A. Acharya. "Enhancement of Dielectric Constant in LaFeO 3 -NiFe2O4 Composites." In 14th Asian Conference on Solid State Ionics (ACSSI 2014). Singapore: Research Publishing Services, 2014. http://dx.doi.org/10.3850/978-981-09-1137-9_044.

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

Prasad, Bandi Vittal, B. Venugopal Rao, K. Narsaiah, G. Narsinga Rao, J. W. Chen, and D. Suresh Babu. "Giant dielectric constant in Cu doped LaFeO[sub 3]." In PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013. AIP, 2013. http://dx.doi.org/10.1063/1.4810407.

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

Nikam, Shrikant K., and Anjali A. Athawale. "Effect of base and dopant concentration on phase formation of LaFeO[sub 3]." In PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013. AIP, 2013. http://dx.doi.org/10.1063/1.4810567.

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

Zhu, Bin, Juncai Sun, Xueli Sun, Song Li, Wenyuan Gao, Xiangrong Liu, and Zhigang Zhu. "Compatible Cathode Materials for High Performance Low Temperature (300–600°C) Solid Oxide Fuel Cells." In ASME 2006 4th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2006. http://dx.doi.org/10.1115/fuelcell2006-97279.

Full text
Abstract:
We have made extensive efforts to develop various compatible electrode materials for the ceria-based composite (CBC) electrolytes, which have been, reported as most advanced LTSOFC electrolyte materials (Zhu, 2003). The electrode materials we have investigated can be classified as four categories: i) LSCCF (LaSrCoCaFeO) and BSCF perovskite oxides applied for our CBC electrolyte LTSOFCs; ii) LFN (LaFeO-based oxides, e.g. LaFe0.8Ni0.2O3) perovskite oxides; iii) lithiated oxides: e.g. LiNiOx, LiVOx or LiCuOx are typical cathode examples for the CBC LTSOFCs; iv) other mixed oxide systems, most common in a mixture of two-oxide phases, such CuOx-NiOx, CuO-ZnO etc. systems with or without lithiation are developed for the CBC systems, especially for direct alcohol LTSOFCs. These cathode materials used for the CBC electrolyte LTSOFCs have demonstrated excellent performances at 300–600°C, e.g. 1000 mWcm−2 was achieved at 580°C. The LTSOFCs can be operated with a wide range of fuels, e.g. hydrogen, methanol, ethanol etc with great potential for applications.
APA, Harvard, Vancouver, ISO, and other styles
6

GUTIERREZ, G. D. "Percival Lafer." In 1º Seminário de Pesquisa em Design do Programa de Pós-Graduação em Design da FAUUSP. São Paulo: Editora Blucher, 2018. http://dx.doi.org/10.5151/spddesign-0015.

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

Zaza, F., V. Pallozzi, E. Serra, and M. Pasquali. "Combustion synthesis of LaFeO3 sensing nanomaterial." In NANOFORUM 2014. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4922559.

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

Kumar, R. Dhinesh, and R. Jayavel. "Synthesis, morphology and optical properties of LaFeO3 nanospheres." In SOLID STATE PHYSICS: Proceedings of the 58th DAE Solid State Physics Symposium 2013. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4872585.

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

Gaikwad, Vishwajit M., Pankaj Uikey, and Smita A. Acharya. "Study of multi-functionality of lanthanum ferrite (LaFeO3)." In NANOFORUM 2014. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4918255.

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

Jain, Pranat, Sanjay Srivastava, Indu Baroliya, and Nitish Gupta. "Structure and particle size analysis of LaFeO3 nanoparticles." In INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2015): Proceeding of International Conference on Condensed Matter and Applied Physics. Author(s), 2016. http://dx.doi.org/10.1063/1.4946710.

Full text
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography