EPR EVIDENCE OF EXTRINSIC SYMMETRY-BREAKING DEFECTS IN NOMINALLY PURE KTAO3

被引：18
|
作者：
PECHENYI, AP
GLINCHUK, MD
AZZONI, CB
SCARDINA, F
PALEARI, A
机构：
[1] UNIV PAVIA,DEPT PHYS ALESSANDRO VOLTA,I-27100 PAVIA,ITALY
[2] UNIV MILAN,DEPT PHYS,I-20133 MILAN,ITALY
来源：
PHYSICAL REVIEW B | 1995年 / 51卷 / 18期
关键词：
D O I：
10.1103/PhysRevB.51.12165
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
EPR measurements on nominally pure (undoped) KTaO3 single crystals at low temperature (4.2 K) are reported. Evidence is brought of impurity defects analyzed through the experimental spin-Hamiltonian parameters. Axial EPR spectra of Fe3+ in different cation positions are detected. An orthorhombic spectrum is found and attributed to Fe3+ substituting for K+ ions and involving nearby potassium vacancies as charge compensators. Manganese impurities are also observed following illumination of the sample to cause a change of the Mn valence state. © 1995 The American Physical Society.
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页码：12165 / 12169
页数：5
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