An off-center ion near a Ba site in BaTiO3 as studied by EPR under uniaxial stress

Autor(en): Lenjer, S
Scharfschwerdt, R
Kool, TW
Schirmer, OF
Stichwörter: electron paramagnetic resonance; ferroelectrics; paint defects; Physics; Physics, Condensed Matter; SRTIO3
Erscheinungsdatum: 2000
Herausgeber: PERGAMON-ELSEVIER SCIENCE LTD
Journal: SOLID STATE COMMUNICATIONS
Volumen: 116
Ausgabe: 3
Startseite: 133
Seitenende: 136
Zusammenfassung: 
In BaTiO3 a paramagnetic defect is identified by EPR which is attributed to a paramagnetic S = 1/2 ion off-center near a Ba site. Twelve magnetically distinguishable sites contribute to the angular dependence pattern of the spectra, each of the sites being characterized by an orthorhombic g-tensor. The relative occupations of the sites change under uniaxial stress in a manner consistent with the model. The features of the center are highly characteristic for the indicated off-center position, as revealed by comparison with the previously identified Ti3+ near a Sr2+ site in SrTiO3. On the basis of the principal values of the g-tensor the paramagnetic ion can be identified with Ni. It is discussed that Ni1+ is the most likely charge state. (C) 2000 Elsevier Science Ltd. All rights reserved.
ISSN: 00381098
DOI: 10.1016/S0038-1098(00)00307-0

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