Das, Ashmita and Shajahan, Irfana and Dasaria, Hari Prasad and Saidutta, M B and Dasari, Harshini (2021) Dilatometer Studies on LAMOX Based Electrolyte Materials for Solid Oxide Fuel Cells. Materials Chemistry and Physics, 258. ISSN 0254-0584

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Abstract

The present study deals with the citrate complexion synthesis of LAMOX-based Solid Oxide Fuel Cell (SOFC) electrolyte materials (La1.8Dy0.2Mo2-xWxO9 (x = 0, 0.1, 0.2, 0.5, and 1), La1.8Dy0.2Mo2-xGaxO9 (x = 0.1, and 0.2), and La1.8Dy0.2Mo2-xVxO9 (x = 0.025, 0.05, 0.1, and 0.2)) and their characterization to understand the sintering behaviour and phase stability. From the dilatometer studies, the linear shrinkage and shrinkage rate of the LDMW (x = 0, and 0.1) showed better shrinkage than LM and LDM. Gallium addition (LDMG) and Vanadium addition (LDMV) showed a negative impact on shrinkage behaviour. In the temperature range of 500 to 580 °C, the abrupt change in shrinkage rate showed the transition of phase from α to β for the LM. The modification of LM to LDM, LDMW, and LDMV suppressed the formation of the α phase. During thermal expansion behaviour study in the temperature range of 100 to 500 °C and 550 to 800 °C, the LM sintered pellet showed the coefficient of thermal expansion (CTE) values of 13.3 х 10-6/ °C and 21.6 х 10-6/ °C respectively. The LDM and LDMW sintered pellets showed the CTE values in the range of 14 to 15 х 10-6/ °C and 16 to 19 х 10-6/ °C, respectively. The relative density of the sintered pellets (1100°C/ 5 h in air) (LM, LDM, LDMW, and LDMG (x = 0.1)) is found to be > 90 %. It provides the suitability of these materials for further investigation as electrolytes of SOFCs / SOECs.

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