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ESR investigations of nominally pure KTaO3

✍ Scribed by M.D. Glinchuk; V.V. Laguta; I.P. Bykov; J. Rosa; L. Jastrabik

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 311 KB
Volume: 232
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(94)01347-x

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✦ Synopsis

An ESR investigation of nominally pure KTaO3 was carried out at 4.2 < T< 77 K. Two new ESR spectra were observed. The first, with cubic symmetry, was shown to be that of Gd 3+ substituted for K +. The analysis of the spectrum line intensities and widths gave no evidence about Ta ions displacements at low temperature. The second spectrum had axial symmetry and its source was identified as a new off-center impurity ion Fe + substituted for K + in KTaO3. The surrounding oxygen ion displacements were shown to be the main reason for the Fe + ESR spectra axiality. The possible origin of the pure KTaO3 low temperature anomalies is discussed.

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