A and B-site substitution of the solid electrolyte LaGaO3 and LaAlO3 with the alkaline-earth oxides MgO and SrO

Chen, Tzer-Shyong; Fung, Kuan‐Zong

doi:10.1016/j.jallcom.2003.08.059

Cited by 28 publications

(15 citation statements)

References 26 publications

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“…These results of Rietveld analysis for LaMO 3 (M=Al, Sc, Fe, Co, Cr, Ga, and In) are summarized in Table II. The lattice parameters obtained accord well with the reported ones 13,16,17 …”

Section: Resultssupporting

confidence: 89%

Synthesis of Various LaMO₃Perovskites in Molten Carbonates

Kojima

Nomura

Miyazaki

et al. 2006

Journal of the American Ceramic Society

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Lanthanum-containing perovskites, LaMO 3 (M 5 Al, Sc, Cr, Mn, Fe, Co, Ni, Ga, and In), have been synthesized in molten carbonates from a mixture of lanthanum carbonate and an Mcontaining oxide or an acetate, or from a co-precipitation mixture of metal (M) and lanthanum. Metal aluminum, chromium, and iron, immersed in a mixture of molten (Li 0.52 Na 0.48 ) 2 CO 3 and lanthanum carbonate at 923 K, were covered, respectively, with LaAlO 3 , LaCrO 3 , and LaFeO 3 . Ceramic and single-crystal a-Al 2 O 3 , immersed in molten (Li 0.52 Na 0.48 ) 2 CO 3 mixed with lanthanum carbonate, were also covered with LaAlO 3 . In situ X-ray diffractometry revealed that La 2 O 2 CO 3 reacted with a-LiAlO 2 to yield LaAlO 3 ; the reaction proceeded faster under N 2 than under a CO 2 atmosphere.(2) LaMO 3 Production on the Metal and Ceramic Surfaces The following substrates were placed in a Au-Pd (80:20 wt%) crucible containing the mixture of (Li 0.52 Na 0.48 ) 2 CO 3 and La 2 (CO 3 ) 3 Á 8H 2 O (1:1 by weight): the metals aluminum (Nilaco Corp., Tokyo, Japan, 99.999%, 20 mm Â 20 mm Â 0.1 mm), chromium (Nilaco, 99.9%, 20 mm Â 5 mm Â 5 mm), iron (Nilaco, 99.98%, 20 mm Â 20 mm Â 0.5 mm), cobalt (Nilaco, 99.98%, 20 mm Â 20 mm Â 0.5 mm), and nickel (Nilaco, 99.7%, 20 mm Â 20 mm Â 0.5 mm), and a-Al 2 O 3 ceramics J ournal

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“…These results of Rietveld analysis for LaMO 3 (M=Al, Sc, Fe, Co, Cr, Ga, and In) are summarized in Table II. The lattice parameters obtained accord well with the reported ones 13,16,17 …”

Section: Resultssupporting

confidence: 89%

Synthesis of Various LaMO₃Perovskites in Molten Carbonates

Kojima

Nomura

Miyazaki

et al. 2006

Journal of the American Ceramic Society

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“…Consequentemente, as vacâncias de oxigênio são geradas para compensar a carga pela substituição dos íons. Estes materiais também possuem baixo custo, maior estabilidade em relação à redução e volatilização dos elementos metálicos e moderada expansão térmica, o que os torna adequados para eletrólitos em CaCOS [4,[12][13][14][15][16].…”

Section: Introductionunclassified

Desenvolvimento microestrutural e mobilidade de íons oxigênio em perovskitas do tipo LaAlO3 dopadas com Sr, Ba e Ca

2020

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RESUMO Materiais com estrutura do tipo perovskita têm sido extensamente investigados na tentativa de encontrar novos eletrólitos para Células a Combustível de Óxido Sólido que operem em baixas temperaturas. Dentre esses materiais destaca-se o LaAlO3 que, quando apropriadamente dopado, apresenta condutividade iônica considerável. Neste trabalho LaAlO3 puro e dopado com Sr, Ba e Ca foram estudados. O método utilizado para preparação dos pós foi o de reação no estado sólido. Análises microestrutural, estrutural e elétrica das amostras sinterizadas foram realizadas por microscopia eletrônica de varredura, difração de raios X e espectroscopia de impedância, respectivamente. Entre os diferentes tipos de dopantes, a amostra dopada com Sr foi a que apresentou maior condutividade, tanto do grão ( a 800°C) como total ( a 800°C). Em todas as amostras dopadas, a condutividade total é controlada pelo contorno de grão e as microestruturas são heterogêneas e o grau de heterogeneidade depende do dopante.

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“…Since the electrical conductivity of LaAlO 3 is significantly affected by adding appropriate dopants, systems based on LaAlO 3 are known to be mixed ionic and p-type electronic conductors at high oxygen partial pressure and good ionic conductors at low oxygen partial pressure. These materials have also low cost, higher stability in different types of atmospheres, and moderate thermal expansion, which make them adequate for SOFC applications [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Effects of Sr and Mn co-doping on microstructural evolution and electrical properties of LaAlO3

Villas-Bôas

Goulart

Ferreira

2019

PAC

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In this work, we investigate the effects of Sr and Mn co-doping on the microstructural development and electrical properties of LaAlO 3 synthesised by solid state reaction and sintered at 1500 and 1600°C. The addition of Sr and Mn contributed to the crystallization and stabilization of the perovskite structure. However, the addition of Sr alone lead to the formation of heterogeneous microstructure, while the combined effect of Sr and Mn improved Al and La homogeneity in the perovskite structure. Total electrical conductivity is enhanced by three orders of magnitude with Sr addition (La 0.8 Sr 0.2 AlO 3-δ : 5.74 × 10 −4 S/cm at 600°C) and five orders of magnitude with Mn co-doping (La 0.8 Sr 0.2 Al 0.8 Mn 0.2 O 3-δ : 3.6 × 10 −2 S/cm at 600°C) compared to the undoped LaAlO 3 (2.96 × 10 −6 S/cm at 600°C). The Sr and Mn co-doped LaAlO 3 present favourable catalytic activity for electrode reactions even with a low dopant concentration (20 mol%).

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A and B-site substitution of the solid electrolyte LaGaO3 and LaAlO3 with the alkaline-earth oxides MgO and SrO

Cited by 28 publications

References 26 publications

Synthesis of Various LaMO₃Perovskites in Molten Carbonates

Synthesis of Various LaMO₃Perovskites in Molten Carbonates

Desenvolvimento microestrutural e mobilidade de íons oxigênio em perovskitas do tipo LaAlO3 dopadas com Sr, Ba e Ca

Effects of Sr and Mn co-doping on microstructural evolution and electrical properties of LaAlO3

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A and B-site substitution of the solid electrolyte LaGaO3 and LaAlO3 with the alkaline-earth oxides MgO and SrO

Cited by 28 publications

References 26 publications

Synthesis of Various LaMO3Perovskites in Molten Carbonates

Synthesis of Various LaMO3Perovskites in Molten Carbonates

Desenvolvimento microestrutural e mobilidade de íons oxigênio em perovskitas do tipo LaAlO3 dopadas com Sr, Ba e Ca

Effects of Sr and Mn co-doping on microstructural evolution and electrical properties of LaAlO3

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Synthesis of Various LaMO₃Perovskites in Molten Carbonates

Synthesis of Various LaMO₃Perovskites in Molten Carbonates