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Etude par Effet Raman de la Transition de Phase α-β du Sulfate de Potassium

✍ Scribed by H. Poulet; J. P. Mathieu

Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
365 KB
Volume
9
Category
Article
ISSN
0377-0486

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✦ Synopsis

Abstract

The α‐β phase transition of a K~2~SO~4~ single crystal has been studied by means of Raman scattering. The temperature variation of the spectra is accounted for by a model in which the order parameter is a pseudo‐spin variable. Above the transition temperature, several Raman lines persist, allowing some external modes to be attributed.

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Etude par Spectrométrie Raman de la Transition de Phase Structurale des Tétrachloro et Tétrabromo-1,2,4,5 Benzenes
✍ B. Pasquier; N. Le Calvé 📂 Article 📅 1977 🏛 John Wiley and Sons 🌐 English ⚖ 469 KB

## Abstract Raman and infrared spectra of crystalline1,2,3,4,5‐tetrachloro‐ and tetrabromobenzenes have been analysed between 10 and 100 cm^−1^ over a range of temperature from 10 K to 400 K. An assignment of lattice modes is given. The first‐order phase transition is of a displacive type as shown