Crystal Lattice Distortion of Cd1-xZnxTe Ternary Alloys

Generalization to other Materials

 

L. Arab, K. Guergouri*

Laboratoire de Physique-Chimie des Semiconducteurs

Département de Physique, Université Mentouri, 25000 Constantine, Algérie

* Corresponding author. E-mail: kaguergouri@yahoo.fr

Received: 31 October 2006; revised version accepted: 04 November 2008

 

Abstract

     This study represents a theoretical approach for determining the crystal lattice distortion of ternary alloys. A tetrahedral model is proposed to calculate the deformation energy and the bond lengths taking or not into account the angles tilt between the bonds. The model is based on the zinc blend microscopic structure and the chemically ordered sublattice deformation and the non-deformation of disordered one.

The calculation was realized by means of two programs using Fortran 90 language. The results about   Cd1-xZnxTe show that there is no angles tilt. The same behavior was obtained by the experiments. The generalization of the model to In1-xGaxAs has led to results well satisfying. This allowed us to propose this model for other materials. This study permits also to clarify the behavior of the CdTe matrix when this material is deformed by introducing Zn atoms.

 

Keywords: Cd1-xZnxTe; Deformation energy; Tetrahedral model; Bond length; angles Tilt; Zinc blend structure.


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