Effect of Ca Content on the Acoustic Anomalies of Ba1-xCaxTiO3 Single Crystals Studied by Brillouin Light Scattering

被引：1

作者：

Kim, Tae Hyun ^{[1
]}

Ko, Jae-Hyeon ^{[1
]}

Park, Kibog ^{[2
]}

Kojima, Seiji ^{[3
]}

Kim, Sung Baek ^{[4
]}

机构：

[1] Hallym Univ, Dept Phys, Chunchon 200702, South Korea

[2] Ulsan Natl Inst Sci & Technol, Sch Elect & Comp Engn, Ulsan 689798, South Korea

[3] Univ Tsukuba, Inst Mat Sci, Tsukuba, Ibaraki 3058573, Japan

[4] Konyang Univ, Adv Coll Educ Ctr, Nonsan 320711, South Korea

来源：

JOURNAL OF THE KOREAN PHYSICAL SOCIETY | 2011年 / 59卷 / 03期

基金：

新加坡国家研究基金会;

关键词：

Barium titanate; Barium calcium titanate; Brillouin scattering; Central peak; Polar cluster;

D O I：

10.3938/jkps.59.2575

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The acoustic anomalies of the longitudinal acoustic mode of Ba1-xCaxTiO3 single crystals with x = 0, 0.12, and 0.20 were investigated in a wide temperature range of 290 similar to 873 K by using a Brillouin light scattering technique. The remarkable changes in the Brillouin frequency shift and the half width of this acoustic mode were attributed to the coupling between the acoustic mode and the polarization fluctuations induced by the precursor polar clusters near the ferroelectric phase transition temperature. The relaxation time estimated from the acoustic mode anomaly showed a critical slowing down behavior and increased with the Ca content. This indicates that the addition of Ca ions at A sites of the perovskite structure of BaTiO3 induces an additional polarization component due to its off-center displacements, thus making the cluster dynamics more sluggish than it is in pure BaTiO3.

引用

页码：2575 / 2578

页数：4

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