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    • A simple model for calculating the bulk modulus of the mixed ionic crystal: NH4Cl1−xBr$_x$

      Vassiliki Katsika-Tsigourakou

      Research Articles Volume 77 Issue 4 October 2011 pp 689-695

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/pram/077/04/0689-0695

    • Keywords

       

      Compressibility; mixed crystal; defect volume.

    • Abstract

       

      The ammonium halides are an interesting systems because of their polymorphism and the possible internal rotation of the ammonium ion. The static properties of the mixed ionic crystal NH4Cl$_{1−x}$ Br$_x$ have been recently investigated, using the three-body potential model (TDPM) by applying Vegard’s law. Here, by using a simple theoretical model, we estimate the bulk modulus of the alloys NH4Cl$_{1−x}$ Br$_x$, in terms of the bulk modulus of the end members alone. The calculated values are comparable to those deduced from the three-body potential model (TDPM) by applying Vegard’s law.

    • Author Affiliations

       

      Vassiliki Katsika-Tsigourakou1

      1. Department of Solid State Physics, Faculty of Physics, University of Athens, Panepistimiopolis, 157 84 Zografos, Greece

    • Dates

       
      Published
      October 2011
      Manuscript received
      19 July 2010
      Manuscript revised
      23 February 2011
      Accepted
      15 April 2011

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