Abstract
We have investigated the thermal properties and specific heat of earth mantle silicates ASiO3 (A = Mg, Ca) by the means of rigid ion model (RIM) and compared them with the earlier experimental reports. The calculated specific heat of ASiO3 (A = Mg, Ca) obeys T3 law at low temperature (T < θD/50). The temperature dependence of the specific heat of MgSiO3 and CaSiO3 (0 K ≤ T ≤ 2000 K) is presented along with the elastic, cohesive and thermal properties, like Bulk modulus (B), cohesive energy (φ), molecular force constant (f), reststrahlen frequency (ν), Debye temperature (θD) and Gruneisen parameter (γ) at T = 300 K.
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