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Study of pressure induced structural phase transition and elastic properties of lanthanum pnictides

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Abstract

We evolve an effective interatomic interaction potential with long range Coulomb interactions, Hafemeister and Flygare type short range overlap repulsion extended up to second neighbor ions and van der Waals interaction to discuss the pressure dependent first order phase transition, mechanical, elastic, and thermodynamical properties of NaCl-type (B1) to CsCl-type (B2) structure in lanthanum pnictides (LaY, Y = N, P, As, Sb, and Bi). Both charge transfer interactions and covalency effect apart from long range Coulomb are important in revealing the high-pressure structural phase transition, associated volume collapse, elastic and thermodynamical properties. By analyzing the aggregate elastic constants pressure (temperature) dependence, the rare earth lanthanum pnictides are mechanically stiffened as a consequence of bond compression and bond strengthening attributed to mechanical work hardening, thermally softening arose due to bond expansion and bond weakening due to lattice vibrations, brittle (ductile) nature at zero (increased) pressure and temperature dependent brittleness from room temperature to high temperatures. To our knowledge these are the first quantitative theoretical prediction of the pressure and temperature dependence of elastic and thermodynamical properties explicitly the mechanical stiffening, thermally softening, and brittle (ductile) nature of rare earth LaY (Y = N, P, As, Sb and Bi) pnictides and still awaits experimental confirmations.

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Authors and Affiliations

  1. School of Physics, Vigyan Bhawan, Devi Ahilya University, Khandwa Road Campus, 452001, Indore, India

    D. Varshney & S. Shriya

  2. Department of Physics, M. B. Khalsa College, 452002, Indore, India

    M. Varshney

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  1. D. Varshney
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  2. S. Shriya
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  3. M. Varshney
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Correspondence to D. Varshney.

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Varshney, D., Shriya, S. & Varshney, M. Study of pressure induced structural phase transition and elastic properties of lanthanum pnictides. Eur. Phys. J. B 85, 241 (2012). https://doi.org/10.1140/epjb/e2012-21054-y

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