Pippard relations applied to the λ-phase transition in NH4Br

被引：3
|
作者：
Yurtseven, H. [1 ]
Yanik, A. [2 ]
Sen, S. [1 ]
机构：
[1] Middle E Tech Univ, Dept Phys, TR-06531 Ankara, Turkey
[2] Istanbul Tech Univ, Dept Phys, TR-80626 Istanbul, Turkey
来源：
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY | 2008年 / 71卷 / 01期
关键词：
Pippard relations; lambda-transition; NH4Br;
D O I：
10.1016/j.saa.2007.10.053
中图分类号：
O433 [光谱学];
学科分类号：
0703 ; 070302 ;
摘要：
We establish here a linear variation of the specific heat C-p with the frequency shifts (l/v)(partial derivative v/partial derivative T)(p) close to the X-phase transition in NH4Br (T-lambda=234 K). This linear relationship is based on our spectroscopically modified Pippard relations. For this verification of our relations, we use our observed Raman frequencies of the lattice mode of v(7) (56 cm(-1)) and the internal mode of v(2) (1684 cm(-1)) in the NH4Br crystalline system. Our study given here indicates that the thermodynamic data can be obtained from the measured frequencies. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：105 / 109
页数：5
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