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Crystal-field analysis of the spectroscopic characteristics and magnetic properties of in crystal

1997; IOP Publishing; Volume: 9; Issue: 20 Linguagem: Inglês

10.1088/0953-8984/9/20/018

1361-648X

Xueyuan Chen, Zundu Luo,

Magnetic Properties and Applications

On the basis of the analysis of a group-chain scheme and with the use of the constraint condition determined by the ratios of crystal-field parameters calculated using the point-charge model, a crystal-field-level fitting has been carried out for , in which the ions are assumed to occupy positions with point symmetry . The RMS value of the energy-level fitting is . The wavefunctions obtained were used in the study of the magnetic, thermal, and spectroscopic properties of the crystal. The calculated g-factors obey Karayianis's partial g-sum rule. The temperature dependences of the Schottky specific heat and magnetic susceptibility agree well with data published by others. The line shown by calculation to be the strongest is -polarized at 450.4 nm, which corresponds to blue upconversion lasing in the experiment. The method proposed turns out to be effective in the study of the spectroscopic and magnetic properties of localized centres in crystals.