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Thermal and Mechanical Properties of ACoO3 (R = Sm, Tb, Dy, Ho, and Er)

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Abstract

The thermal and mechanical properties of orthocobaltates, ACoO3 (A = Sm, Tb, Dy, Ho, and Er), have been investigated using the modified rigid ion model (MRIM) by incorporating the effect of lattice distortions. We have computed the variations of specific heat and thermal expansion coefficient for these orthocobaltates in wide temperature range of 1 K (−272 °C) ≤ T ≤ 1000 K (727 °C). The calculated results of specific heat, thermal expansion, bulk modulus, and other thermal and mechanical properties accord very well with the available experimental data, implying that MRIM represents properly the nature of the perovskite-type rare earth cobaltates. In addition, we have also reported the results on molecular force constant (f), Reststrahlen frequency (υ), cohesive energy (ϕ), Debye temperature (θ D), and Gruneisen parameter (γ).

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Acknowledgments

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

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Authors and Affiliations

  1. Department of Physics, Barkatullah University, Bhopal, 462026, India

    N. K. Gaur (Professor) & Rasna Thakur (Research Scholar)

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  1. N. K. Gaur
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  2. Rasna Thakur
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Correspondence to Rasna Thakur.

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Manuscript submitted December 20, 2012.

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Gaur, N.K., Thakur, R. Thermal and Mechanical Properties of ACoO3 (R = Sm, Tb, Dy, Ho, and Er). Metall Mater Trans A 44, 5876–5883 (2013). https://doi.org/10.1007/s11661-013-1942-1

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