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High Pressure Structural Phase Transition and Elastic Properties of Europium Chalcogenides

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Abstract:

The high pressure induced structural phase transition and elastic properties of three Europium chalcogenides (EuX; X = S, Se, Te) have been studied using a two body potential approach. The calculated compression curves of EuS, EuSe and EuTe obtained so has been compared with recently measured three body potential data. The calculated transition pressures are in good agreement with the experimental data. The phase transition pressure for EuS, EuSe and EuTe going from the NaCl phase to CsCl phase have been observed are 22 GPa, 15 GPa, 10 GPa respectively, close the theoretical and experimental data. We have also calculated bulk modulas and second order elastic constants at high pressure which show partly ionic nature of theses compounds. The B₁ (NaCl) phase is found to be higher in energy than the B₂ (CsCl) phase and more stable at zero pressure.

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Periodical:

Advanced Materials Research (Volume 1047)

Pages:

163-169

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1047.163

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Online since:

October 2014

Authors:

Ashvini K. Sahu, M. Aynyas, R. Bhardwaj, Sankar P. Sanyal

Keywords:

Chalcogenides, Elastic Properties, High Pressure, Phase Transition

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