UV absorption spectra of thin films of Cs2CdI4 and Rb2CdI4 ferroelectrics

被引：5
作者：
Yunakova, ON
Miloslavskii, VK
Kovalenko, EN
机构：
[1] Kharkov Natl Univ, UA-61077 Kharkov, Ukraine
[2] Minist Educ & NAS Ukraine, Phys & Technol Res Ctr, UA-61145 Kharkov, Ukraine
来源：
PHYSICS OF THE SOLID STATE | 2003年 / 45卷 / 05期
关键词：
D O I：
10.1134/1.1575338
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Thin films of M2CdI4 ferroelectrics (M=Cs, Rb) of orthorhombic structure were synthesized, and their electronic optical spectrum was studied. It was established that both compounds belong to direct-gap dielectrics and that their low-frequency excitons are localized on a sublattice made up of (CdI4)(2-) tetrahedra. The temperature dependence of the exciton band parameters was studied for Cs2CdI4 within the temperature interval 90-420 K. The phase transitions occurring in this interval manifest themselves as breaks in the temperature behavior of the band spectral positions and weak peaks in the halfwidth and oscillator strength. (C) 2003 MAIK "Nauka/Interperiodica".
引用
收藏
页码：932 / 937
页数：6
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