NISCAIR Online Periodicals Repository

Research Journals >
Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.44 [2006] >
IJPAP Vol.44(05) [May 2006] >

Title: Lattice dynamical calculations of spinel structure compounds
Authors: Kushwaha, A K
Shankar, Girija
Kushwaha, S S
Keywords: Spinel structure
Lattice dynamics
Zone center
Issue Date: May-2006
Publisher: CSIR
IPC CodeC30B
Abstract:  Lattice dynamical calculations have been performed for normal spinel structure compounds using the proposed theoretical model. In this model, the dynamical matrix is split into two parts: (i) the short range part is evaluated by using Taylor’s expansion of the crystal potential energy in the harmonic approximation and (ii) the long range part is evaluated on the basis of screened Coulomb potential. This model is applied to study the zone centre (=0) phonon frequencies of sulphide spinels MCr2S4 (M= Mn, Fe, Cd). The significant outcome of the present work is that (i) the tetrahedral M-S force constants are smaller than the respective octahedral (Cr-S) ones, (ii) the bending force constants are negligible, and (iii) the effective dynamical charges of the bivalent metal ions are nearly zero. The zone-center phonon frequencies, thus calculated using these parameters are found to be in very good agreement with the observed results.
Page(s): 385-390
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.44(05) [May 2006]

Files in This Item:

File Description SizeFormat
IJPAP 44(5) 385-390.pdf208.22 kBAdobe PDFView/Open
 Current Page Visits: 108 
Recommend this item


Online Submission of Articles |  NISCAIR Website |  National Knowledge Resources Consortium |  Contact us |  Feedback

Disclaimer: NISCAIR assumes no responsibility for the statements and opinions advanced by contributors. The editorial staff in its work of examining papers received for publication is helped, in an honorary capacity, by many distinguished engineers and scientists.

CC License Except where otherwise noted, the Articles on this site are licensed under Creative Commons License: CC Attribution-Noncommercial-No Derivative Works 2.5 India

Copyright © 2015 The Council of Scientific and Industrial Research, New Delhi. All rights reserved.

Powered by DSpace Copyright © 2002-2007 MIT and Hewlett-Packard | Compliant to OAI-PMH V 2.0

Home Page Total Visits: 170574 since 01-Sep-2015  Last updated on 30-Jun-2016Webmaster: