Thermoanalytical study and crystallization of Ba(PO3)2–WO3 glasses

被引:0
作者
Petr Kalenda
Ladislav Koudelka
Petr Mošner
Ludvík Beneš
Helena Drobná
机构
[1] University of Pardubice,Department of General and Inorganic Chemistry, Faculty of Chemical Technology
[2] University of Pardubice,Joint Laboratory of Solid State Chemistry
[3] University of Pardubice,Department of Physical Chemistry, Faculty of Chemical Technology
来源
Journal of Thermal Analysis and Calorimetry | 2019年 / 137卷
关键词
Phosphate glasses; Thermal properties; Physical properties; Crystallization;
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中图分类号
学科分类号
摘要
Barium phosphate glasses of the composition (100 − x)Ba(PO3)2–xWO3 with 0–60 mol% WO3 were prepared and studied. Thermal studies of the glasses were carried out with DTA, dilatometry and hot-stage microscopy. Glass transition temperature in this glass series increases with increasing WO3 content from 461 °C (x = 0) to 623 °C (x = 60). Most glasses containing WO3 crystallize on heating within the range of 650–750 °C with the exception of glasses with 20–30 mol% WO3, which are thermally stable. Very high chemical durability of these glasses with dissolution rate of 1.4 × 10−8–6.2 × 10−9 g cm−2 min−1 was also revealed. Crystallization of glasses revealed the existence of a new compound Ba(WO2)2(PO4)2 in the studied compositional series. The compound Ba(WO2)2(PO4)2 possess hexagonal unit cell of dimensions a = 11.5191(1) Å and c = 6.3437(1) Å, and its melting point is 936 °C. Raman spectra of crystallized glasses confirmed the formation of crystalline compound in this glass series and revealed the presence of glass phase in some thermal-treated samples. 31P MAS NMR showed on only one coordination of phosphorus atoms in the Ba(WO2)2(PO4)2 compound.
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页码:1911 / 1918
页数:7
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