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Thermoelastic behaviour of mixed ammonium halides

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Czechoslovak Journal of Physics Aims and scope

Abstract

A theory for the temperature derivatives of second order elastic constants of ammonium chloride and ammonium bromide, crystalizing in ceasium chloride structure has been developed incorporating contributions due to the thermal phonons and three body interactions in the lattice energy in the framework of Hildebrand approximation. The expressions for the temperature derivatives have been derived by differentiating the expressions of the second order elastic constants. The repulsive potential which is taken to be of the Born-Mayer type is assumed significant up to the first neighbours only. Computations have been made for pure and mixed crystals NH4Cl1−xBrx for x=0, 0.13, 0.23 and 1.00. The results have been found in agreement with the experimental data wherever these are available.

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Authors and Affiliations

  1. Department of Physics, Punjab Agricultural University, 141 004, Ludhiana, India

    S. S. Bedi

  2. Malwa College, Bondli-Samrala, Ludhiana, India

    Jaspal Singh

Authors
  1. S. S. Bedi
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  2. Jaspal Singh
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The authors are thankful to the referee for his valuable comments and suggestions which helped them in the revision of the paper.

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Bedi, S.S., Singh, J. Thermoelastic behaviour of mixed ammonium halides. Czech J Phys 42, 431–437 (1992). https://doi.org/10.1007/BF01598740

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  • DOI: https://doi.org/10.1007/BF01598740

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