doi: 10.3850/978-981-08-7614-2_IMPRES009

ABSTRACT

With the objective of exploring the unknown thermodynamic phase diagram of Bi_1-xSr_xMnO₃ family, we present here an investigation of the temperature-dependent (10K < T < 900K) thermodynamic behavior of Bi_1-xSr_xMnO₃ (x=0.1-0.8). We report here probably for the first time the thermal expansion and specific heat along with other thermal properties of strontium doped perovskite manganite BiMnO₃. The specific heat values revealed by using RIM are in close agreement with the available experimental data for some concentrations (x) of Bi_1-xSr_xMnO₃. The bulk modulus of Bi_1-xSr_xMnO₃ (x=0.1-0.8) in spin ordered and paramagnetic phase is also investigated with the help of atoms in molecule (AIM) theory and the results are closer to values for the similar compound LaMnO₃. In addition, the results on the bulk modulus (B), cohesive energy (Φ) in orthorhombic perovskite phase, molecular force constant (f), Reststrahlen frequency (ν_o) and Gruneisen parameter (γ) are also presented.

Keywords: Specific heat, Thermodynamic properties, Solid oxide fuel cell, Colossal magnetoresistance material.

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