| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1237738 | Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy | 2008 | 4 Pages |
Abstract
Our Raman bandwidths of those modes are studied using a power-law formula on the basis of the soft mode-hard mode coupled model. From our analysis, we extract the values of the critical exponent β for the order parameter of the ferro-ordered (NH4Cl) and the antiferro-ordered (NH4Br) phases. Our β values are close to zero which exhibits a logarithmic behaviour in the vicinity of the λ-phase transitions in NH4Cl and NH4Br. It is indicated here that the ammonium halides (NH4Cl and NH4Br) undergo a weakly first order or nearly second order phase transition close to the λ transition point.
Keywords
Related Topics
Physical Sciences and Engineering
Chemistry
Analytical Chemistry
Authors
H. Yurtseven, T.U. Tüzer,