ANOMALOUS THERMOELASTIC BEHAVIOR OF (KI)1-X(NH4I)X

被引：14

作者：

BERRET, JF

BRUCHHAUSER, F

FEILE, R

BOSTOEN, C

HAUSSUHL, S

机构：

[1] UNIV MAINZ,INST PHYS,W-6500 MAINZ,GERMANY

[2] UNIV INSTELLING ANTWERP,DEPT NAT KUNDE,B-2610 WILRIJK,BELGIUM

[3] UNIV COLOGNE,INST KRISTALLOG,W-5000 COLOGNE,GERMANY

来源：

SOLID STATE COMMUNICATIONS | 1990年 / 74卷 / 10期

关键词：

D O I：

10.1016/0038-1098(90)90706-H

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

An anomalous softening of the shear mode c44 is observed in (KI)1-x(NH4I)x with Brillouin scattering (10K ≤ T ≤ 300K). It is caused by the weak quadrupolar moment of the NH4+ ion, induced by the C3v symmetry of the potential. A parallel decrease of the lifetime of this transverse phonon at lower temperatures is observed. Static random strain fields due to admixing KI with NH4I are small. The results have been treated in terms of a mean field theory. The c11 elastic constant does not show any anomalous behavior. Also are given the elastic constants c11 and c44 for x=0.14, 0.43 and 1 and 1 at T = 300K and 10K. © 1990.

引用

页码：1041 / 1045

页数：5

共 30 条

[1] THE THERMAL PROPERTIES OF ALKALI HALIDE CRYSTALS .1. THE HEAT CAPACITY OF POTASSIUM CHLORIDE, POTASSIUM BROMIDE, POTASSIUM IODIDE AND SODIUM IODIDE BETWEEN 2.8-DEGREES-K AND 270-DEGREES-K [J].