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Compressibility; mixed crystal; defect volume.

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.

Vassiliki Katsika-Tsigourakou¹

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

Published

October 2011

Manuscript received

19 July 2010

Manuscript revised

23 February 2011

Accepted

15 April 2011