期刊
CHEMICAL PHYSICS
卷 254, 期 1, 页码 25-30出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/S0301-0104(00)00026-4
关键词
alpha-ZnAl2S4; tiospinel; magnetic susceptibility; luminescence
The magnetic susceptibility as well as the optical excitation and luminescence spectra of three samples of alpha-ZnAl2S4 tiospinel doped with Cr at various concentrations have been measured in the temperature range 77-300 K. The susceptibility has allowed us to estimate the concentration of Cr in the samples studied as lying in the range 0.01-0.06 at.%. Crystal-field theory, including spin-orbit coupling and the trigonal crystal field of the D-3d Site has been used to fit the optical data. The best-fit parameters of the tiospinel crystal are B-20 = 4800, B-40 = 32 500, B-43 = -28 500, F-(2) = 58 800, F-(4) = 40 500 and xi(D) = 300 cm(-1). The computational procedure used gives excellent agreement between the experimental and calculated energy levels of the Cr3+ ion in the alpha-ZnAl2S4 matrix. (C) 2000 Published by Elsevier Science B.V. All rights reserved.
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