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Thermal properties and crystallization of BaO-MoO3-P2O5 glasses
Year: 2018
Type of publication: článek v odborném periodiku
Name of source: Journal of Thermal Analysis and Calorimetry
Publisher name: Springer
Place: Dordrecht
Page from-to: 2303-2310
Titles:
Language Name Abstract Keywords
cze Termické vlastnosti a krystalizace skel systému BaO-MoO3-P2O5 Termické vlastnosti a krystalizace fosfátových skel barnatých modifikovaných oxidem molybdenovým byly studovány ve sklech řady A: (100 - x)Ba(PO3)(2)-xMoO(3) (kde x = 0-70 mol.%) a řady B: 50BaO-yMoO(3)-(50 - y)P2O5 (kde y = 0-15 mol.% MoO3). Termické vlastnosti byly studovány pomocí diferenční termické analýzy a dilatometrie. Teplota skelného přechodu v řadě A roste v kompozočním intervalu 0-40 mol.% MoO3, ale s dalším růstem obsahu MoO3 klesá. Koeficient teplotní roztažnosti v kompoziční řadě A vykazuje minimum při obsahu 50 mol.% MoO3. Krystalizace sjek vedla ke tvorbě sloučeniny Ba(MoO2)(2)(PO4)(2) v tomto ternárním systému. fosforečnanová skla; BaO-MoO3-P2O5; krystalizace; Ramanova spektra
eng Thermal properties and crystallization of BaO-MoO3-P2O5 glasses The thermal behavior and crystallization of barium molybdate-phosphate glasses were studied in two compositional series, namely A: (100 - x)Ba(PO3)(2)-xMoO(3) (with x = 0-70 mol%) and B: 50BaO-yMoO(3)-(50 - y)P2O5 (with y = 0-15 mol% MoO3). Thermal properties were studied with differential thermal analysis and dilatometry. Glass transition temperature increases in series A in the range of 0-40 mol% MoO3 and then decreases with a further increase in MoO3 content, whereas the thermal expansion coefficient in series A reveals a minimum at 50 mol% MoO3. These trends are not observed in series B, where the glass transition temperature increases in the range of 0-15 mol% MoO3 and the thermal expansion coefficient almost does not change. Crystallization of these glasses was studied by X-ray diffraction analysis, Raman and P-31 MAS NMR spectroscopy. Large thermal stability of glass with a composition 35BaO-30MoO(3)-35P(2)O(5) toward crystallization was demonstrated. Crystallization of glasses resulted in the formation of the compound Ba(MoO2)(2)(PO4)(2) in this ternary system. Raman spectroscopy also provided information on the formation of glass-crystalline samples in some studied compositions. Barium molybdate-phosphate glasses; Thermal analysis; Crystallization; XRD; Raman spectra

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