Soft mode in PMN-PSN ceramics

被引：4
|
作者：
Macutkevic, J. [1 ]
Grigalaitis, R. [2 ]
Adomavicius, R. [1 ]
Krotkus, A. [1 ]
Banys, J. [1 ]
Valusis, G. [1 ]
Bormanis, K. [3 ]
Sternberg, A. [3 ]
机构：
[1] Lithuania Acad Sci, Inst Semicond Phys, LT-232600 Vilnius, Lithuania
[2] Vilnius State Univ, Fac Phys, Vilnius, Lithuania
[3] Latvian State Univ, Inst Solid State Phys, LV-1063 Riga, Latvia
来源：
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS | 2008年 / 245卷 / 06期
关键词：
D O I：
10.1002/pssb.200844040
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Various ordered and disordered (1-x)Pb(Mg1/3Nb2/3)O-3 -xPb(Sc1/2Nb1/2)O-3 (PMN-PSN) ceramics were studied by THz transmission spectroscopy in the temperature range of 10-300 K. It is found that the dielectric relaxation dominates in the spectra in higher temperatures, T > 170 K. In contrast, below 150 K, the strength of relaxation becomes so weak that the phonon contribution can be separated. The phonon contribution. in the investigated frequeney range (200 GHz-2 THz) is presumably caused by the E component of the Last mode. The component exhibits hardening on cooling in all investigated ceramics and its critical temperature in ferroelectric PMN-PSN ceramics (x = 1, 0.95) is lower than the critical temperature in PMN-PSN relaxors (x = 0.2).
引用
收藏
页码：1206 / 1209
页数：4
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