Influence of Yttria-Stabilized Zirconia on Microstructure and Electrical Properties of Doped Lanthanum Gallate

Fujimoto, T.G.; Reis, S.L.; Muccillo, E.N.S.

doi:10.1590/1980-5373-mr-2019-0043

Cited by 3 publications

(3 citation statements)

References 19 publications

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“…8YSZ was also added as a minor phase (up to 20 wt.%) to strontium-and magnesium-doped lanthanum gallate (LSGM). Reduction of the fraction of impurity phases, accompanied by a slight increase of the ionic conductivity were reported 13 . The addition of 8YSZ to Bi 2 O 3 revealed a dual structure with high ionic conductivity and suitable thermal expansion coefficient up to 650 ºC 14 .…”

Section: Introductionmentioning

confidence: 94%

Mechanical and Electrical Characterization of 8YSZ-ScCeSZ Ceramics

et al. 2023

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The effects of small amounts (up to 5 wt.%) of scandia-and ceria-stabilized zirconia on the electrical conductivity, and the elastic modulus and hardness of yttria-stabilized zirconia were investigated by impedance spectroscopy and nanoindentation tests, respectively. The main purpose of this work was to obtain solid electrolyte compounds with improved properties compared to those of the base materials. Solid electrolytes compounds were prepared by solid-state reaction synthesis with sintering at 1450 ºC for 4 h. All prepared compounds exhibit a cubic fluorite-type structure. The microstructure of the compounds consists of polygonal grains with low (< 2%) porosity. The mean grain size estimated by the intercept method was 5 ± 1 μm. The electrical conductivity of the compound ceramics is lower than that of the base material. Addition of scandia-stabilized zirconia is found to exert a beneficial effect on the matrix by increasing the elastic modulus, achieving 221 MPa for 5 wt.% of the additive.

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Section: Introductionmentioning

confidence: 94%

Mechanical and Electrical Characterization of 8YSZ-ScCeSZ Ceramics

et al. 2023

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“…An analysis of recent studies illustrates that LSGM can be used as a base matrix for the formation of both composite electrodes and new composite electrolytes [200,[204][205][206][207][208][209][210]. Xu et al [200] fabricated a cell based on a La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3−δ -Ce 0.8 Gd 0.2 O 1.9 electrolyte, with Sr 2 CoMoO 6−δ -La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3−δ as the anode and Sr 2 Co 0.9 Mn 0.1 NbO 6−δ -La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3−δ as the cathode.…”

Section: Applications In Sofcsmentioning

confidence: 99%

Recent Progress in the Design, Characterisation and Application of LaAlO3- and LaGaO3-Based Solid Oxide Fuel Cell Electrolytes

Филонова

Medvedev

2022

Nanomaterials

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Solid oxide fuel cells (SOFCs) are efficient electrochemical devices that allow for the direct conversion of fuels (their chemical energy) into electricity. Although conventional SOFCs based on YSZ electrolytes are widely used from laboratory to commercial scales, the development of alternative ion-conducting electrolytes is of great importance for improving SOFC performance at reduced operation temperatures. The review summarizes the basic information on two representative families of oxygen-conducting electrolytes: doped lanthanum aluminates (LaAlO3) and lanthanum gallates (LaGaO3). Their preparation features, chemical stability, thermal behaviour and transport properties are thoroughly analyzed in terms of their connection with the target functional parameters of related SOFCs. The data presented here will serve as a starting point for further studies of La-based perovskites, including in the fields of solid state ionics, electrochemistry and applied energy.

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“…Compósitos contendo La0,9Sr0,1Ga0,8Mg0,2O3-δ e 8YSZ foram preparados pelo método da reação em estado sólido e a adição de 8YSZ reduziu as frações das fases impurezas no LSGM. Houve pequeno acréscimo na condutividade de volume ("bulk") adicionando 1% em massa de 8YSZ, com a diminuição da energia de ativação aparente para condução [42].…”

Section: Eletrólitos Sólidos Compósitosunclassified

Preparação e caracterização de compósitos de galato de lantânio contendo estrôncio e magnésio/galato de estrôncio

Paula¹

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PAULA, P. P. d. . Preparation and characterization of strontium and magnesium doped lanthanum gallate/strontium gallate composites. 2021. 68 p. Dissertação (Mestrado em Tecnologia Nuclear), Instituto de Pesquisas Energéticas e Nucleares, IPEN-CNEN/SP, São Paulo. Ceramic composites based on strontium-and magnesium-doped lanthanum gallate (LSGM), and strontium gallate (SG) were prepared by the conventional solid-state synthesis method. The LSGM and SG compounds as well as the LSGM-xSG (x=05, 0.75, 1.0, 1.5 and 2.0% mol) composites were characterized by X-ray diffraction, scanning electron microscopy and impedance spectroscopy techniques. The main purpose of this work was to verify the effects of the minor phase (SG) on those properties. The base compounds investigated were La0.9Sr0.1Ga0.8Mg0.2O3- (LSGM10) and La0.85Sr0.15Ga0.8Mg0.2O3- (LSGM15).Sintering experiments allowed for determining an ideal sintering temperature of 1400 ºC resulting in compacts with high relative densities (> 92%). Linear shrinkage measurements evidenced that the SG phase slows down the LSGM densification. The microstructure of the base compounds (LSGM10 and LSGM15) along with that of composites is heterogenous, Dispersive energy spectroscopy coupled to scanning electron microscopy evidenced obtaining the composites.Results of electrical conductivity determined by impedance spectroscopy revealed that SG addition to LSGM10 and LSGM15 promoted increase of the bulk conductivity. This increase was higher for LSGM10 containing 1 mol% SG.

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Influence of Yttria-Stabilized Zirconia on Microstructure and Electrical Properties of Doped Lanthanum Gallate

Cited by 3 publications

References 19 publications

Mechanical and Electrical Characterization of 8YSZ-ScCeSZ Ceramics

Mechanical and Electrical Characterization of 8YSZ-ScCeSZ Ceramics

Recent Progress in the Design, Characterisation and Application of LaAlO3- and LaGaO3-Based Solid Oxide Fuel Cell Electrolytes

Preparação e caracterização de compósitos de galato de lantânio contendo estrôncio e magnésio/galato de estrôncio

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