INVESTIGATION OF THE LOCAL GEOMETRY OF NI2+ IONS IN AN AL2O3 CRYSTAL FROM EPR DATA

Authors
Citation
Wc. Zheng, INVESTIGATION OF THE LOCAL GEOMETRY OF NI2+ IONS IN AN AL2O3 CRYSTAL FROM EPR DATA, Physica. B, Condensed matter, 192(4), 1993, pp. 322-324
Citations number
6
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics, Condensed Matter
ISSN journal
0921-4526
Volume
192
Issue
4
Year of publication
1993
Pages
322 - 324
Database
ISI
SICI code
0921-4526(1993)192:4<322:IOTLGO>2.0.ZU;2-P
Abstract
The EPR parameters D, g(parallel-to) and DELTAg (=g(parallel-to) - g(p erpendicular-to)) for Ni2+ in an Al2O3 crystal have been studied by us ing the high-order perturbation formulas and the parameters based on t he optical absorption spectrum. From the study, one can find that to r each a good fit between calculated and observed EPR parameters, the Ni 2+ ion is required to move 0.05 angstrom from the exact site of the re placed Al3+ ion and to be closer to the midway plane between the oxyge n layers. The reasonableness of this displacement is discussed.