RAMAN STUDIES OF THE 223-K PHASE-TRANSITION IN (NH4)2SO4 SINGLE-CRYSTAL

被引：8

作者：

KWON, SB

KIM, JJ

机构：

[1] Dept. of Phys., Korea Adv. Inst. of Sci. and Technol., Seoul

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1990年 / 2卷 / 51期

关键词：

D O I：

10.1088/0953-8984/2/51/030

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The temperature dependence of the z(yy)x Raman spectrum was studied in (NH4)2SO2 single crystal in the temperature range 300-100 K. The temperature dependence of the NH4 translational Raman bands in the region of 200 cm-1 seems to support the hypothesis that the peculiar temperature dependence of the spontaneous polarization in (NH4)2SO4 single crystal may be ascribed to the competing polarization contributions from the NH4(+)(I) and NH4(+)(II) dipoles of opposite direction with differing reorientational relaxation temperature dependences, and also the NH4(+)-SO4(-2) displacive lattice polarization, which was neglected in the point-charge model.

引用

页码：10607 / 10613

页数：7

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