Huge dielectric constant of Rb2CdI4 and K2ZnI4 crystals grown by Czochralski method

被引:4
作者
Yamaguchi, T. [1 ,2 ]
Gotou, S. [2 ]
Shimizu, F. [3 ]
Takashige, M. [3 ]
机构
[1] Meisei Univ, Sch Sci & Engn, Hino, Tokyo 1918506, Japan
[2] Meisei Univ, Grad Sch Sci & Engn, Hino, Tokyo 1918506, Japan
[3] Iwaki Meisei Univ, Coll Sci & Engn, Iwaki, Fukushima 9708551, Japan
关键词
Tl2ZnI4 group ferroelectrics; Sr2GeS4; structure; domain motion; Czochralski method; dielectric dispersion;
D O I
10.1080/01411594.2011.558305
中图分类号
O7 [晶体学];
学科分类号
0702 ; 070205 ; 0703 ; 080501 ;
摘要
Temperature and frequency dependences of the dielectric constant and the spontaneous polarization were measured for crystals of Rb2CdI4 and K2ZnI4 obtained by the Czochralski method. The dielectric constant of both crystals shows a huge sharp peak just below the Curie point T-C and the peak value is 57,000 at T-C = 210.3K of Rb2CdI4 and 27,000 at T-C = 272.5K of K2ZnI4. Below T-C, it shows a shoulder-like dielectric dispersion, which is connected to ferroelectric domain motions. The spontaneous polarization of K2ZnI4 was measured by the pyroelectric method and is about 3.9 x 10(-2) Cm-2 at 4K. The effects of dc field application on the dielectric properties are also discussed.
引用
收藏
页码:865 / 871
页数:7
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