title: EPR paramaters and defect structure of the trigonal Ti2+ center in ZnS.
abstract: The axial Ti2+ center in a nearly wholly cubic ZnS crystal is assigned to the Ti2+ ion on the hexagonal site of wurtzite structure caused by stacking faults. On the ground of the assignment, the EPR parameters (zero-field splitting D, g factor g( parallel) and g-anisotropy Deltag=g( parallel)-g( perpendicular)) of the axial Ti2+ center are calculated from the high-order perturbation formulas based on the cluster approach for the EPR parameters of 3d2 ion in trigonal symmetry. From the calculations, the local atom-position parameter u(loc) (which is different from the corresponding parameter u in the host wurtzite structure) and hence the defect structure of the Ti2+ center are estimated. The results (the calculated EPR parameters and the defect structure) are discussed.
authors.affiliation: Department of Material Science, Sichuan University, Chengdu 610064, PR China. zhengwcl@163.com
authors.forename: Zheng
authors.initials: Z
authors.lastname: Wen-Chen
authors.forename: Mei
authors.initials: M
authors.lastname: Yang
authors.forename: Wu
authors.initials: W
authors.lastname: Xiao-Xuan
mesh_terms: D002244:Carbon / Q000737:chemistry; D002413:Cations, Divalent / Q000737:chemistry*; D003035:Cobalt / Q000737:chemistry; D004578:Electron Spin Resonance Spectroscopy; D006859:Hydrogen / Q000737:chemistry; D014025:Titanium / Q000737:chemistry*; D019287:Zinc Sulfate / Q000737:chemistry*
chemical_list: D002413:Cations, Divalent; D003035:Cobalt; D002244:Carbon; D019287:Zinc Sulfate; D006859:Hydrogen; D014025:Titanium