BRILLOUIN-SCATTERING STUDIES OF THE ANTIFERRODISTORTIVE PHASE-TRANSITION IN NANO3

被引：2
作者：
YOSHIDA, S
TSUJIMI, Y
YAGI, T
机构：
[1] Research Institute for Electronic Science, Hokkaido University
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1995年 / 64卷 / 01期
关键词：
BRILLOUIN SCATTERING; ANTIFERRODISTORTIVE PHASE TRANSITION; SODIUM NITRATE; ELASTIC STIFFNESS CONSTANT; RELAXATION TIME; CRITICAL SLOWING DOWN;
D O I：
10.1143/JPSJ.64.5
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The longitudinal acoustic mode propagating along the three-fold z axis in NaNO3 has been studied by Brillouin scattering in the temperature range between 23.22 degrees C and 299.55 degrees C. The frequency shift and the spectral width of the Brillouin peak show anomalous behavior near the transition temperature T-c = 276.5 degrees C. The relaxation time of the antiferrodistortive mode of NO, ions is calculated from these anomalies through the use of Debye type susceptibility. The temperature dependence of the relaxation time has been determined below T-c to be tau(f)/(T-c - T), where tau(f) is (6.0 +/- 0.7) x 10-(11) sec deg.
引用
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页码：5 / 8
页数：4
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