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      Crystallization in Lead Tungsten Fluorophosphate Glasses

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          Abstract

          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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          Transparent glass ceramics for 1300 nm amplifier applications

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            Structural design of sealing glasses

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              Bulk photochromism in a tungstate-phosphate glass: a new optical memory material?

              In this work, we present a new photochromic tungstate based glass which have both absorption coefficient and refractive index modified under laser exposure. The photosensitive effect is superficial under ultraviolet (UV) irradiation but occurs in the entire volume of the glass under visible irradiation. The effect can be obtained in any specific point inside the volume using an infrared femtosecond laser. In addition, the photosensitive phenomenon can be erased by specific heat treatment. This glass can be useful to substitute actual data storage supports and is a promising material for 3-dimensional (3D) and holographic optical storage.
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                Author and article information

                Contributors
                Role: ND
                Role: ND
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                Journal
                mr
                Materials Research
                Mat. Res.
                ABM, ABC, ABPol (São Carlos )
                1980-5373
                February 2015
                : 18
                : 1
                : 228-232
                Affiliations
                [1 ] Universidade Federal de Alfenas Brazil
                [2 ] Universidade Federal de São João del-Rei Brazil
                [3 ] Universidade de São Paulo Brazil
                Article
                S1516-14392015000100228
                10.1590/1516-1439.351714
                2beded79-ba04-4175-8887-9c0a034241ff

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1516-1439&lng=en
                Categories
                ENGINEERING, CHEMICAL
                MATERIALS SCIENCE, MULTIDISCIPLINARY
                METALLURGY & METALLURGICAL ENGINEERING

                General materials science,General engineering
                glasses,phosphate,lead fluoride
                General materials science, General engineering
                glasses, phosphate, lead fluoride

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