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Dielectric relaxation in Ba2NaNb5(1-x)Ta5xO15 single crystals

被引：38
作者：
Mizaras, R
Takashige, M
Banys, J
Kojima, S
Grigas, J
Hamazaki, SI
Brilingas, A
机构：
[1] IWAKI MEISEI UNIV, COLL SCI & ENGN, IWAKI, FUKUSHIMA 970, JAPAN
[2] UNIV TSUKUBA, INST APPL PHYS, TSUKUBA, IBARAKI 305, JAPAN
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1997年 / 66卷 / 09期
关键词：
ferroelectricity; dielectric relaxation; phase transition; tungsten bronze; single crystals;
D O I：
10.1143/JPSJ.66.2881
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
This paper presents the results of dielectric dispersion in Ba2NaNb5(1-x)Ta5xO15 (BNNT) single crystals over the frequency range 1 kHz to 4 GHz. The fundamental dielectric dispersion occurs above 10(7) Hz and is caused by a soft relaxational mode. This mode gives the main contribution to the high static permittivity which fits the Curie-Weiss law. The results indicate the anharmonic motion of the Nb(Ta) atoms and the order-disorder nature of the proper ferroelectric phase transition in BNNT.
引用
收藏
页码：2881 / 2885
页数：5
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