Crystallization in Lead Tungsten Fluorophosphate Glasses
AUTOR(ES)
Nardi, Rachel Prado Russo Delorenzo, Braz, Celso Eduardo, Pereira, Camila, Freschi, Carolina Dakuzaku, Ferrari, Jefferson Luiz, Stucchi de Camargo, Andrea Simone, Eckert, Hellmut, Cassanjes, Fabia Castro, Poirier, Gael
FONTE
Mat. Res.
DATA DE PUBLICAÇÃO
2015-02
RESUMO
The glass forming ability was investigated in the codoped Er3+/Yb3+ ternary system NaPO3-WO3-PbF2 with increasing amounts of PbF2. It has been found that glass samples can be obtained for PbF2 contents ranging from 0 mole% to 50 mole% for the codoped samples and an undoped sample containing 60% of lead fluoride could also be vitrified. Thermal properties of the most PbF2 concentrated glasses exhibit strong dependence of the composition with a decrease of the glass transition temperatures and thermal stabilities against devitrification with increasing the lead fluoride content. These glass samples were heat-treated near the crystallization peaks and the X-ray diffraction measurements pointed out that the dominant phase which precipitates from the glass samples containing 40% and 50% of PbF2 is the lead fluorophosphate phase Pb5F(PO4)3 whereas the sample containing 60% of PbF2 exhibits a preferential bulk crystallization of cubic lead fluoride β-PbF2.
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