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Study of crystallization of PbO-WO3-P2O5 glasses by thermoanalytical and spectroscopic method
Year: 2014
Type of publication: článek v odborném periodiku
Name of source: Journal of Non-Crystalline Solids
Publisher name: Elsevier Science BV
Place: Amsterdam
Page from-to: 41-46
Titles:
Language Name Abstract Keywords
cze Studie krystalizace skel PbO-WO3-P2O5 termoanalytickými a spektroskopickými metodami Krystalizace skel z ternárního systému PbO-WO3-P2O5 byla studována v kompozičních řadách (100 x) [0.5PbO-0.5P(2)O(5)]-xWO(3) (řada A), 50PbO-(50 - y)P2O5-yWO(3) (řada B) a (50 - z) PbO-50P(2)O(5)-zWO(3) (řada C), vycházejících ze skla o složení Pb(PO3)(2). Produkty krystalizace práškových vzorků skel byly studovány rentgenovou difrakční analýzou a Ramanovou spektroskopií. Rtg. analýza prokázala tvorbu různých krystalických fosfátovoých sloučenin a u vzorků s vysokým obsahem WO3 rovněž vznik nové krystalické sloučeniny Pb(WO2)(2)(PO4)(2) v řadách A a B. Její parametry činí a = 11.3531(1) angström a c = 63168(1) angström. Ramanova spektra potvrdila výsledky rtg. analýzy a v některých případech ukázala na tvorbu skelně-krystalických fází. fosfátová skla; krystalizace; rtg.difrakce; Ramanova spektra
eng Study of crystallization of PbO-WO3-P2O5 glasses by thermoanalytical and spectroscopic method The crystallization of PbO-WO3-P2O5 ternary glasses was studied in three compositional series of (100 x) [0.5PbO-0.5P(2)O(5)]-xWO(3) glasses (A series), 50PbO-(50 - y)P2O5-yWO(3) glasses (B series) and (50 - z) PbO-50P(2)O(5)-zWO(3) glasses (C series) beginning with Pb(PO3)(2). The crystallization products of the annealed glass powders were evaluated using X-ray diffraction and Raman spectroscopy. The results of the X-ray diffraction analysis of the crystallized glasses revealed the formation of several crystalline phosphate compounds and in the samples with a high WO3 content also the formation of a new crystalline compound of Pb(WO2)(2)(PO4)(2) in series A and B. From the obtained diffraction pattern, the hexagonal cell parameters were calculated as a = 11.3531(1) angstrom and c = 63168(1) angstrom. The surface mechanism of crystallization dominates the crystallization process of the glass into the Pb(WO2)(2)(PO4)(2) compound as evaluated using Day's method. Raman spectra of the crystallized samples confirmed the results of the X-ray diffraction measurements and provided information on the thermal stability of the glasses and formation of the glass-crystalline phases by the annealing of glass samples. phosphate glasses; crystallization; X-ray diffraction; Raman spectra

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