The Structure of a New Type Infra-red Optical Fibre Material MnF₂-BaCl₂ System Glass

By means of visible—ultraviolet absorption spectrum and EXAFS, the structure of a new type infrared optical fibre material （60-x）MnF₂·40BaCl₂·xMnCl₂（x=0,10,20,30） glasscs was characterized. The visiblc—UV absorption spectra show that Mn²⁺ in MnF₂-BaCl₂ glass has a structure of mixed halide octahedra MnF_6-yCl_y. The near neighboring coordination around Mn²⁺ was studied by EXAFS. Based on the results and a having been suggested structural model for MnF₂-BaF₂ glass, the structural characters of MnF₂-BaCl₂ glass were presented.