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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geprüft am 01.06.2024