Thermally stimulated crystallization of (20-x)LiO{sub 2}-80TeO{sub 2}-xWO{sub 3} glass system

Journal Article · Sun May 15 00:00:00 EDT 2011 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2011.03.013· OSTI ID:21494302

Sidel, S M; Capanema, W A; Araujo, E B ^[1]; Moraes, J C.S., ^[1]; Yukimitu, K ^[1]

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1. Faculdade de Engenharia, UNESP-Univ Estadual Paulista, Ilha Solteira, SP (Brazil)

Tellurite glasses of the (20-x)LiO{sub 2}-80TeO{sub 2}-xWO{sub 3} system were synthesized (x=0, 5, and 10) and annealed at different temperatures, and the crystallization kinetics was studied using XRD, FTIR spectroscopy, and DSC techniques. XRD data evidenced the amorphous state of as-quenched samples, while thermally treated samples showed the growth of crystalline phases. FTIR spectroscopy was used to observe the evolution of the vibrational mode assigned to the TeO{sub 2} phases. The presence of {gamma}-TeO{sub 2}, {alpha}-TeO{sub 2}, and {alpha}-Li{sub 2}Te{sub 2}O{sub 5} crystalline phases was observed for the sample TL, x=0, while only the first and second phases were observed for TLW5 and TLW10 samples, x=5 and 10, respectively, suggesting that WO{sub 3} enters the structure preferentially as glass former, inhibiting the growth of the phase {alpha}-Li{sub 2}Te{sub 2}O{sub 5}. -- Graphical abstract: Typical DSC thermogram for TLW glasses for different heating rates with insert graphic showing as the Tg is evaluated. Display Omitted Highlights: {yields} The crystallization kinetics was studied using XRD, FTIR spectroscopy, and DSC techniques. {yields} The glass transition and maximum crystallization temperatures increase when the WO{sub 3} content in the glass composition was increased. {yields} The observed asymmetry of crystallization peaks suggests an overlapping of distinct crystallization phases ({alpha}- and {gamma}-TeO{sub 2}). {yields} The WO{sub 3} enters the structure as glass former and does not participate in the crystallization of glass.

• OSTI ID: 21494302
• Journal Information: Journal of Solid State Chemistry, Vol. 184, Issue 5; Other Information: DOI: 10.1016/j.jssc.2011.03.013; PII: S0022-4596(11)00110-1; Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ACTIVATION ENERGY
AMORPHOUS STATE
ANNEALING
CALORIMETRY
CRYSTALLIZATION
GLASS
HEATING RATE
INFRARED SPECTRA
KINETICS
LITHIUM OXIDES
SPECTROSCOPY
TELLURIUM OXIDES
TUNGSTEN OXIDES
X-RAY DIFFRACTION
ALKALI METAL COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
DIFFRACTION
ENERGY
HEAT TREATMENTS
LITHIUM COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
REFRACTORY METAL COMPOUNDS
SCATTERING
SPECTRA
TELLURIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS