Low-Symmetry Aspects in EPR Spectra of Mn2+ at Bi3+ Sites in BiVO4 Single Crystal |
| T.H. Yeom, S.H. Choh Department of Physics, Korea University, Seoul 136-701, Republic of Korea and Cz. Rudowicz Department of Applied Science, City Polytechnic of Hong Kong, Hong Kong |
| Received: June 10, 1992 |
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| Zero-field splitting parameters obtained from EPR X-band experiments of Baran et al. (1985) and Yeom et al. (1992) are reanalyzed. Transformation relations are derived to express the two sets of data in the same axis system. Problems arising from using a truncated zero-field splitting Hamiltonian in fitting the experimental data are elucidated. Low-symmetry aspects in EPR spectra of Mn2+ at Bi3+ sites in BiVO4 single crystal are considered. Good agreement for orthorhombic parameters b02 and b22 is obtained indicating that the centres observed in the two cases are the same Mn centres. The remaining bqk parameters accounting for the actual site symmetry around Mn2+ impurity which seems to be lower than orthorhombic in the ferroelastic phase cannot be unambiguously determined from the existing EPR data. |
| DOI: 10.12693/APhysPolA.82.503 PACS numbers: 75.10.Dg, 76.30.Da, 61.16.Hn, 78.20.Hp |