Vibrational analysis of optical phonons in mixed chromite spinels

Authors
Sinha, MM
Citation
Mm. Sinha, Vibrational analysis of optical phonons in mixed chromite spinels, NUCL INST B, 153(1-4), 1999, pp. 183-185
Citations number
15
Categorie Soggetti
Spectroscopy /Instrumentation/Analytical Sciences","Instrumentation & Measurement
Journal title
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
ISSN journal
0168583X → ACNP
Volume
153
Issue
1-4
Year of publication
1999
Pages
183 - 185
Database
ISI
SICI code
0168-583X(199906)153:1-4<183:VAOOPI>2.0.ZU;2-E
Abstract
The composition dependence of zone-centre optical phonons of mixed chromite spinel has been investigated. The computational analysis of zone-centre fr equencies at all composition ranges lead me to predict one-mode behaviour i n these spinels. The present calculation of high-frequency bands in the IR spectrum (nu(1) and nu(2)) Of the mixed Cu1-xMgxCr2O4 system are in good ag reement with experimental results whereas the low frequency (nu(3)) differs slightly from observed results. Most of the infrared frequencies of mixed chromite spinels are found nearly insensitive to a modification of the biva lent cations. (C) 1999 Elsevier Science B.V. All rights reserved.