Phase composition, densification and electrical conductivity of La0.9Sr0.1Ga0.8Mg0.2O3− consolidated by the two-stage sintering method
Source abstract
Abstract
Abstract The influence of the method of sintering on densification, phase assemblage and electrical conductivity of Sr- and Mg-doped lanthanum gallate was investigated aiming to optimize the sintering process of this solid electrolyte. Powder mixtures were prepared by solid state reactions, and the sintering of green compacts was carried out by the two-stage method varying the temperature of the first stage ( T 1 ) and the isothermal temperature ( T 2 ) and time ( t 2 ) profile. The type and content of predominant impurity phases depend on specific parameters of the sintering process. In the first stage of sintering, the content of impurity phases, such as LaSrGaO 4 and La 4 Ga 2 O 9 , decreases with increasing temperature. The relative density of sintered specimens reaches 99% whenever T 1 is 1500 °C. The mean grain size varies from 1.45 to 4.9 µm. At 600 °C the electrical conductivity attains 12 mS cm −1 for T 1 1400 °C and T 2 1350 °C for 5 h, with activation energy of approximately 1 eV.
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Research context
OpenAlex topics: Advancements in Solid Oxide Fuel Cells · Nuclear materials and radiation effects · Electronic and Structural Properties of Oxides
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References (30)
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