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XPS characterization of YAlO3:Co single crystals

✍ Scribed by E. Talik; M. Kruczek; W. Zarek; J. Kusz; K. Wójcik; H. Sakowska; W. Szyrski

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
177 KB
Volume
42
Category
Article
ISSN
0232-1300

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✦ Synopsis

Abstract

YAlO~3~:Co (YAP:Co) single crystals have been obtained by the Czochralski method. The XPS spectra of YAP:Co annealed in reducing atmospheres: H~2~, vacuum and vacuum plus H~2~ are presented and discussed. As confirmed by magnetic measurements and the electron spectroscopy XPS the dopant concentration of Co is lower than a nominal one. The annealing processes removed colour centers due to relocation and some reduction of oxygen ions in the structure. The increased unit volume during the long annealing process may be caused by the change in some Co^3+^ ions into Co^2+^ ions. This explains the occurrence of the violet colour of the longtime annealed samples. The chemical shift analysis shows more ionic bond of Y–O than Al–O. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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