Elastic Anisotropy and Slowness Curves of BaTiO3 Single Crystals in the Paraelectric Phase Studied by Brillouin Spectroscopy

被引：0

作者：

Lee, Jeong Woo ^{[1
]}

Ko, Jae-Hyeon ^{[1
]}

Roleder, Krystian ^{[2
]}

Rytz, D. ^{[3
]}

机构：

[1] Hallym Univ, Dept Phys, Chunchon 24252, South Korea

[2] Univ Silesia, Inst Phys, Ul 75 Pulku Piechoty 1, PL-41500 Chorzow, Poland

[3] Edelsteine Edelmetalle GmbH FEE, Forsch Inst Mineral & Metall Werkstoffe, Struthstr 2, D-55743 Idar Oberstein, Germany

来源：

JOURNAL OF THE KOREAN PHYSICAL SOCIETY | 2019年 / 74卷 / 11期

关键词：

Barium titanate; Sound velocity; Elastic constant; Slowness curve; Brillouin scattering;

D O I：

10.3938/jkps.74.1089

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Elastic anisotropy and slowness curves of barium titanate (BaTiO3) single crystal in the paraelectric phase were investigated by using Brillouin spectroscopy. The directional dependence of sound velocities of the longitudinal and the transverse acoustic waves in the (001) plane showed a four-fold symmetry typical in the cubic phase. Especially, one of the two transverse modes exhibited a substantial softening along the <110> directions. The sound velocity of this mode decreased significantly as temperature decreased toward the transition temperature, which corresponded to the elastic stiffness coefficient (C-11 - C-12)/2. This result suggests the tetragonal instability caused by the precursor polar clusters in the paraelectric phase of BaTiO3.

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页码：1089 / 1092

页数：4

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