Abstract

We have obtained sharp and clearly resolved ESR spectra of and in vapor transport equilibrium (VTE) treated crystals, consequently have determined more accurate spin Hamiltonian parameters, than those in congruent samples. The anisotropic hyperfine structures of and in the VTE-treated crystals at liquid helium temperature have been analyzed. It is proposed that both rare earth ions favor the lithium site in from the consideration of the determined anisotropic g-values.

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