ULTRASONIC DISPERSION AND QUADRUPOLAR MOMENTS IN K0.95LI0.05TAO3

被引：14

作者：

DOUSSINEAU, P ^{[1
]}

FRENOIS, C ^{[1
]}

LEVELUT, A ^{[1
]}

ZIOLKIEWICZ, S ^{[1
]}

HOCHLI, UT ^{[1
]}

机构：

[1] IBM CORP,DIV RES,ZURICH RES LAB,CH-8803 RUSCHLIKON,SWITZERLAND

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1991年 / 3卷 / 43期

关键词：

D O I：

10.1088/0953-8984/3/43/004

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Ultrasonic measurements are reported on K0.95Li0.05TaO3 in a frequency range from 10(7) to 10(9) Hz and in a temperature range from 4 K to 200 K. The data for T greater-than-or-equal-to 75 K are discussed in terms of a relaxation process associated with pi/2 reorientations and quadrupole moments induced by off-centre Li impurities. Relaxation is slightly polydispersive and follows an Arrhenius law with an excitation energy of 1070 K; there is no critical retardation. The Arrhenius parameters are similar to those found for nuclear magnetic relaxation. Below 70 K the data are indicative of scattering of acoustic waves by macroscopic domains.

引用

页码：8369 / 8375

页数：7

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