Spectroscopic modifications of Pippard relations: first-order and second-order phase transitions in NH4Cl

Authors
Yurtseven, H Yanik, A
Citation
H. Yurtseven et A. Yanik, Spectroscopic modifications of Pippard relations: first-order and second-order phase transitions in NH4Cl, J MOL STRUC, 560(1-3), 2001, pp. 161-167
Citations number
15
Categorie Soggetti
Physical Chemistry/Chemical Physics
Journal title
JOURNAL OF MOLECULAR STRUCTURE
ISSN journal
00222860 → ACNP
Volume
560
Issue
1-3
Year of publication
2001
Pages
161 - 167
Database
ISI
SICI code
0022-2860(20010129)560:1-3<161:SMOPRF>2.0.ZU;2-S
Abstract
In this study we introduce the spectroscopic modifications of Pippard relat ions and apply them to the disorder-induced Raman modes of NH4Cl in the fir st-order (P = 0) and second-order (2.8 kbar) phase regions in this crystall ine system. We obtain Linear variations of the specific heat C-p with out o bserved frequency shifts [(l/nu)(partial derivative nu/partial derivativeT) (p)] of those Raman modes studied for the first-order and second-order phas e transitions in NH4Cl. This will be discussed in detail. (C) 2001 Elsevier Science B.V. All rights reserved.