A KINETIC-PHASE TRANSFORMATION NEAR 250-K IN POTASSIUM TETRACHLOROZINCATE

被引：13

作者：

NOIRET, I

HEDOUX, A

GUINET, Y

FOULON, M

机构：

[1] Laboratoire de Dynamique et Structure des Matériaux Moléculaires, CNRS URA Université de Lüle, U.F.R. de Physique Bât. PS, 59655, Villeneuve d’Ascq

来源：

EUROPHYSICS LETTERS | 1993年 / 22卷 / 04期

关键词：

COMMENSURATE-INCOMMENSURATE TRANSITIONS; PHONONS AND VIBRATIONS IN CRYSTAL LATTICES; RAMAN AND RAYLEIGH SPECTRA (INC SCATTERING);

D O I：

10.1209/0295-5075/22/4/005

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Raman-scattering experiments have been performed to study the successive phase transitions of K2ZnCl4 over the temperature range (100 divided-by 600) K. The spectra provide the temperature dependence of the mode frequencies and linewidths for two different spatial configurations: a(bb) c and c(aa) b. Special emphasis is put upon a new phenomenon observed in the spectra around 250 K in the c*/3 superstructure. Its kinetic character is revealed by complementary DSC measurements carried out over the range (120 divided-by 300) K. This phenomenon is interpreted as a progressive structural transformation which corresponds to a slow modification of the tetrahedron distortions.

引用

页码：265 / 270

页数：6

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