摘要
Introduction In BaFCl crystal which is of PbFCl type structure in tetragonal system, Ba;ions situate at sites of C;point symmetry, while F;and Cl;ions occupy sites of D;and C;symmetry, respectively. The rare earth ions RE;doped in BaFCl should randomly replace the sites of Ba;ions, and their extra positive charges may be compensated by
基金
Supported by the National Natural Science Foundation of China.
