Thermodynamic properties of La1−xAxCoO3 (A=K, Cd, Pr and Nd)

Abstract

Abstract We have calculated the thermal and allied properties of La 1− x A x CoO 3 ( A =K, Cd, Pr, Nd and 0≤ x ≤1) as a function of temperature 1 K≤ T ≤300 K for the first time using Modified Rigid Ion Model (MRIM). The calculated bulk modulus, specific heat, thermal expansion and other thermodynamic properties obtained from MRIM have presented proper interpretation of the experimental data, for monovalent (K + ), divalent (Cd 2+ ) and trivalent (Pr 3+ and Nd 3+ ) ion-doped LaCoO 3 . In addition, the results on the cohesive energy ( ϕ ), molecular force constant ( f ), Reststrahlen frequency ( υ ), Debye temperature ( θ D ) and Gruneisen parameter ( γ ) are also discussed.