期刊
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
卷 81, 期 1, 页码 57-60出版社
SPRINGER
DOI: 10.1007/s10973-005-0745-z
关键词
EPR spectra; glass transition temperature; phosphotungstate glasses
Glasses belonging to the series yA(2)O-(1-y)[0.25(WO3)(2-)0.75P(2)O(5)] (y=0.10-0.60) are elaborated. DTA experiments reveal that the glass-network of the glasses are broken with increasing of modifier content. EPR spectra show the presence of two signals due to W5+ and Mo5+, as impuritie. The intensity of these EPR centres decreases when the concentration of A(2)O increases. The variation of T-g upon the modifier content is ascribed to structural changes occurring in the matrix of these glasses.
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