Soft modes responsible for α-β and β-γ phase transitions of KIO3 crystals

被引：7

作者：

Ahart, M ^{[1
]}

Kojima, S

Takagi, M

Maeda, M

Suzuki, I

机构：

[1] Univ Tsukuba, Inst Appl Phys, Tsukuba, Ibaraki 3058573, Japan

[2] Nagoya Inst Technol, Dept Elect & Comp Engn, Showa Ku, Nagoya, Aichi 4660061, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS | 1998年 / 37卷 / 10期

关键词：

KIO3; Raman; soft mode; perovskite; ferroelectric; ferroelastic;

D O I：

10.1143/JJAP.37.5687

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The alpha-beta and beta-gamma phase transitions of KIO3 crystals have been studied by Raman scattering. The two lowest optical modes of 32 cm(-1) and 38 cm(-1) at - 180 degrees C show remarkable softening towards the beta-gamma transition temperature of 72 degrees C. The third lowest mode of 63 cm(-1) at -180 degrees C also softens markedly towards the alpha-beta transition temperature of 212 degrees C. This mode shows a kink near the beta-gamma phase transition and a strong polarization dependence. These three soft modes strongly suggest that these two phase transitions have a displacive nature.

引用

页码：5687 / 5690

页数：4

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