Thermodynamic properties of BaRuO₃

Abstract

We have investigated the specific heat, thermal expansion and thermodynamic properties of BaRuO₃ in rhombohedral, hexagonal and cubic phase using the modified rigid ion model (MRIM) by incorporating the effect of lattice distortions. The calculated Debye temperature, specific heat and other thermal properties reproduce well with the available experimental data, implying that MRIM represents properly the nature of the perovskite-type BaRuO₃. Besides, we have reported the thermal expansion (α), bulk modulus (B), cohesive energy (ϕ), molecular force constant (f), Reststrahlen frequency (υ), Debye temperature (θ _D), and Gruneisen parameter (γ).

Keywords:

• specific heat
• thermal expansion
• bulk modulus
• ruthenates

Acknowledgements

The authors are grateful to the University Grant Commission (UGC), New Delhi for providing financial support.