LOW-SYMMETRY ASPECTS IN EPR-SPECTRA OF MN2+ AT BI3+ SITES IN BIVO4 SINGLE-CRYSTAL

被引:7
作者
YEOM, TH
CHOH, SH
RUDOWICZ, C
机构
[1] CITY POLYTECH HONG KONG,DEPT APPL SCI,HONG KONG,HONG KONG
[2] UNIV KOREA,DEPT PHYS,SEOUL 136701,SOUTH KOREA
关键词
D O I
10.12693/APhysPolA.82.503
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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 b2(0) and b2(0) is obtained indicating that the centres observed in the two cases are the same Mn centres. The remaining b(k)q 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.
引用
收藏
页码:503 / 510
页数:8
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