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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >EXAFS spectroscopic study of PbO-Bi_2O_3-Ga-2O_3 glasses
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EXAFS spectroscopic study of PbO-Bi_2O_3-Ga-2O_3 glasses

机译：PbO-Bi_2O_3-Ga-2O_3玻璃的EXAFS光谱研究

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摘要

Extended X-ray absorption fine structure (EXAFS) spectra for ternary heavy metal oxide glasses with compositions of (1 - x)(0.75PbO + 0.25Ga_2O_3) + xBi_2O_3 where x increased from 0 to 0.4 in 0.1 increments, indicate the formation of GaO_4 tetrahedral unit with Ga-O bond length of approx 1.87 A in all glasses. Pb also forms both PbO_3 and PbO_4 polyhedra, but the average oxygen coordination number around lead decreases from 3.50 to 2.96 with decreasing PbO concentration. From the EXAFS data we conclude that Bi forms BiO_5 and BiO_6 units as it does in the #alpha#-Bi_2O_3 crystal. Two distinct Bi-O distances of approx 2.18 and approx 2.46 A were resolved. Formation of each type of the polyhedra results in shortage of total oxygen ions for forming two-fold coordinated oxygens and as a result, formation of three-coordinated oxygens becomes necessary.
机译：具有（1-x）（0.75PbO + 0.25Ga_2O_3）+ xBi_2O_3组成的三元重金属氧化物玻璃的扩展X射线吸收精细结构（EXAFS）光谱，其中x以0为增量从0增加到0.4，表明形成了GaO_4所有玻璃中Ga-O键长约为1.87 A的四面体单元。 Pb也会同时形成PbO_3和PbO_4多面体，但是随着PbO浓度的降低，铅周围的平均氧配位数从3.50降至2.96。根据EXAFS数据，我们得出结论，Bi像在＃alpha＃-Bi_2O_3晶体中一样形成BiO_5和BiO_6单元。解析了大约2.18和大约2.46 A的两个不同的Bi-O距离。每种多面体的形成导致形成二配位氧的总氧离子短缺，结果，三配位氧的形成变得必要。

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