Temperature Dependence of Second and Higher order Elastic Constants of Orientationally Disordered (ND4I)x(KI)1-x Mixed Crystals
Volume: 2 - Issue: 12 - Date: 01-12-2013
Approved ISSN: 2278-1412
Published Id: IJAECESTU220 | Page No.: 283-287
Author: Alpana Tiwari
Co- Author:
Abstract:-We have incorporated the translational rotational (TR) coupling effects in the
framework of three body force shell model (TSM) to develop an extended TSM (ETSM). This
ETSM has been applied to reveal the second order elastic constants (C11, C12 and C44) in the dilute
regimes 0≤ x ≤ 0.47 as a function of temperature for 10K≤T≤300K. The anomalous elastic
behavior in C44 below 100 K has been depicted well by ETSM results in the orientationally
disordered (ND4I)x(KI)1-x mixed crystals. In order to present a visual comparison of the TRcoupling effect on second order elastic constants, we have evaluated the SOECs with and without
TR coupling term in ETSM. Besides third order elastic constants have also been studied and
discussed for concentration range 0≤x≤0.47 as a function of temperature for 10K≤T≤300K.
Key Words:- Orientational glass, TR-coupling, Elastic constants, Anharmonicity.
Area:-Engineering
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