PARAMAGNETIC DEFECTS IN BATIO3 AND THEIR ROLE IN LIGHT-INDUCED CHARGE TRANSPORT - OPTICAL STUDIES

被引：29
|
作者：
POSSENRIEDE, E [1 ]
JACOBS, P [1 ]
KROSE, H [1 ]
SCHIRMER, OF [1 ]
机构：
[1] UNIV OSNABRUCK,FACHBEREICH PHYS,BARBARASTR 7,W-4500 OSNABRUCK,GERMANY
来源：
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 1992年 / 55卷 / 01期
关键词：
D O I：
10.1007/BF00324605
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
On the basis of a previous identification of paramagnetic defects in nominally undoped as grown BaTiO3 single crystals, we have investigated the changes of the concentrations of these centers and their optical absorptions under illumination with light of varying wavelengths. The most pronounced charge transfers occur by hole ionization of Fe4+ and - to a lesser extent - of Cr5+ and Cr4+. At low temperatures the created holes are trapped in the form of O--ions next to Al3+ or unkown acceptor defects. Corresponding Fe4+ and O- absorptions have been identified.
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页码：73 / 81
页数：9
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