EXAFS STUDY OF TERNARY ZRF4-BAF2-NDF3 GLASSES

The atomic scale structures of 56ZrF4.4OBaF2.4NdF3 and 62ZrF4.30BaF2.8NdF3 glasses were studied by X-ray absorption fine structure (EXAFS). The near neighboring structures surrounding Zr in these two glasses are similar to those in 66.6ZrF4.33.4BaF2 and 75ZrF4.25BaF2 glasses. However, the coordination numbers of Ba in NdF3 doped glasses decrease. Moreover, the intensities of white lines of both Nd L,, and L,,, XANES in the glasses are greater than that in crystalline NdF3, which suggest bonding of Nd3+ has some degrees of covalency. Besides, the white lines of Ba L,,, edge in the studied glasses show different features. These indicate differing bonding characters of Nd3+ and Ba2+ in these glasses.Materials Science, CeramicsMaterials Science, MultidisciplinarySCI(E)EI7ARTICLE2-3172-17815