The short-range order in ternary ZrF 4BaF 2ErF 3 glasses

Abstract

The short-range order structures in ternary ZrF 4BaF 2ErF 3 glasses have been studied by X-ray absorption fine structure (XAFS). The near-neighbor structures around Zr, Ba and Er have been determined and compared with that in binary ZrF 4BaF 2 glasses. The near-neighbor structures around Zr and Ba are scarcely affected by doping with ErF 3. The structural parameters of near neighbors around Er in the glasses are near to that in ErF 3, but the corresponding distance and coordination number of near neighbors in the glasses decrease slightly. It is also observed that the intensities of the white lines at the Er L ‖ and L ⦀ absorption edges in these glasses are different from that in c-ErF 3. Meanwhile, compared with that of the corresponding fluoride, the changes of the ‘white line’ at the Er L ‖,⦀-edges in the glasses differ from the case of Nd. The causes leading to these differences are discussed.