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The thermal expansion and specific heat of solid oxide fuel cell cathode material Nd1-xSrxCoO3-δ

The thermal and allied properties of Nd1−xSrxCoO3-δ (0≤x≤0.8) were investigated in this work by means of Modified Rigid Ion Model (MRIM). Theoretically, MRIM provides arguably the most realistic interaction potential to treat these properties. We have computed the variation of specific heat and volume thermal expansion coefficient for these cobaltates. Here, Bulk modulus obtained from AIM theory is observed to be decreasing with increasing doping concentration x. The lattice specific heat is related to Debye temperature and hence this property shows a increasing trend with x and thermal expansion also follows the same increasing trend. The trend of variation of Debye temperature (θD), thermal expansion (α), bulk modulus (B) and cohesive energy (φ) with A-site cationic radius is predicted probably for the first time for these technologically important doped rare earth cobaltates.