Crystallization in Lead Tungsten Fluorophosphate Glasses

The glass forming ability was investigated in the codoped Er super(3+)/Yb super(3+) ternary system NaPO sub(3)-WO sub(3)-PbF sub(2) with increasing amounts of PbF sub(2). It has been found that glass samples can be obtained for PbF sub(2) contents ranging from 0 mole% to 50 mole% for the codoped sam...

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Published inMaterials research (São Carlos, São Paulo, Brazil) Vol. 18; no. 1; pp. 228 - 232
Main Authors 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
Format Journal Article
LanguageEnglish
Portuguese
Spanish
Published ABM, ABC, ABPol 01.02.2015
Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
Subjects
Concentration (composition)
Crystallization
ENGINEERING, CHEMICAL
Fluorides
Glass
glasses
Heat treatment
lead fluoride
MATERIALS SCIENCE, MULTIDISCIPLINARY
METALLURGY & METALLURGICAL ENGINEERING
Moles
phosphate
Thermal properties
Tungsten
glasses
phosphate
lead fluoride
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Summary:The glass forming ability was investigated in the codoped Er super(3+)/Yb super(3+) ternary system NaPO sub(3)-WO sub(3)-PbF sub(2) with increasing amounts of PbF sub(2). It has been found that glass samples can be obtained for PbF sub(2) 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 PbF sub(2) 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 PbF sub(2) is the lead fluorophosphate phase Pb sub(5) F(PO sub(4)) sub(3) whereas the sample containing 60% of PbF sub(2) exhibits a preferential bulk crystallization of cubic lead fluoride [beta]-PbF sub(2).
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ISSN:1516-1439
1980-5373
1516-1439
1980-5373
DOI:10.1590/1516-1439.351714