Crystallization kinetics of the tungsten-tellurite glasses

M. Çelikbilek; A. E. Ersundu; N. Solak; S. Aydin

doi:10.1016/j.jnoncrysol.2010.09.012

Crystallization kinetics of the tungsten-tellurite glasses

M. Çelikbilek^*, A. E. Ersundu, N. Solak, S. Aydin

^*Corresponding author for this work

Department of Metallurgical and Materials Engineering

Istanbul Technical University

Research output: Contribution to journal › Article › peer-review

46 Citations (Scopus)

Abstract

The crystallization kinetics of the (1 - x)TeO₂-xWO₃ (where x = 0.10, 0.15, and 0.20, in molar ratio) glass system was studied by non-isothermal methods using differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. DSC measurements were performed at different heating rates to study crystallization kinetics of the first crystallization reactions of the glasses. XRD analysis of tungsten-tellurite glasses heat-treated above the first crystallization temperatures revealed that the first crystallization peaks attributed to the α-TeO₂ and γ-TeO₂ crystalline phases for 0.90TeO₂-0.10WO₃ and 0.85TeO₂-0.15WO ₃ samples and α-TeO₂ and WO₃ crystalline phases for the 0.80TeO₂-0.20WO₃ sample. Avrami constants, n, calculated from Ozawa equation, were found between 1.14 and 1.44. The activation energies, E_A, for the first crystallization reactions were determined by using the modified Kissinger equation as 379 kJ/mol, 288.1 kJ/mol and 228.8 kJ/mol, for 0.90TeO₂-0.10WO₃, 0.85TeO ₂-0.15WO₃ and 0.80TeO₂-0.20WO₃ glasses, respectively.

Original language	English
Pages (from-to)	88-95
Number of pages	8
Journal	Journal of Non-Crystalline Solids
Volume	357
Issue number	1
DOIs	https://doi.org/10.1016/j.jnoncrysol.2010.09.012
Publication status	Published - 1 Jan 2011

Funding

The authors gratefully acknowledge The Scientific and Technological Research Council of Turkey (TUBITAK) for the financial support under the project numbered 108M077 .

Funders	Funder number
TUBITAK	108M077
Türkiye Bilimsel ve Teknolojik Araştirma Kurumu

Keywords

Crystallization kinetics
Non-isothermal analysis
Tungsten-tellurite glasses

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10.1016/j.jnoncrysol.2010.09.012

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abstract = "The crystallization kinetics of the (1 - x)TeO2-xWO3 (where x = 0.10, 0.15, and 0.20, in molar ratio) glass system was studied by non-isothermal methods using differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. DSC measurements were performed at different heating rates to study crystallization kinetics of the first crystallization reactions of the glasses. XRD analysis of tungsten-tellurite glasses heat-treated above the first crystallization temperatures revealed that the first crystallization peaks attributed to the α-TeO2 and γ-TeO2 crystalline phases for 0.90TeO2-0.10WO3 and 0.85TeO2-0.15WO 3 samples and α-TeO2 and WO3 crystalline phases for the 0.80TeO2-0.20WO3 sample. Avrami constants, n, calculated from Ozawa equation, were found between 1.14 and 1.44. The activation energies, EA, for the first crystallization reactions were determined by using the modified Kissinger equation as 379 kJ/mol, 288.1 kJ/mol and 228.8 kJ/mol, for 0.90TeO2-0.10WO3, 0.85TeO 2-0.15WO3 and 0.80TeO2-0.20WO3 glasses, respectively.",

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AU - Çelikbilek, M.

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AU - Solak, N.

AU - Aydin, S.

PY - 2011/1/1

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N2 - The crystallization kinetics of the (1 - x)TeO2-xWO3 (where x = 0.10, 0.15, and 0.20, in molar ratio) glass system was studied by non-isothermal methods using differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. DSC measurements were performed at different heating rates to study crystallization kinetics of the first crystallization reactions of the glasses. XRD analysis of tungsten-tellurite glasses heat-treated above the first crystallization temperatures revealed that the first crystallization peaks attributed to the α-TeO2 and γ-TeO2 crystalline phases for 0.90TeO2-0.10WO3 and 0.85TeO2-0.15WO 3 samples and α-TeO2 and WO3 crystalline phases for the 0.80TeO2-0.20WO3 sample. Avrami constants, n, calculated from Ozawa equation, were found between 1.14 and 1.44. The activation energies, EA, for the first crystallization reactions were determined by using the modified Kissinger equation as 379 kJ/mol, 288.1 kJ/mol and 228.8 kJ/mol, for 0.90TeO2-0.10WO3, 0.85TeO 2-0.15WO3 and 0.80TeO2-0.20WO3 glasses, respectively.

AB - The crystallization kinetics of the (1 - x)TeO2-xWO3 (where x = 0.10, 0.15, and 0.20, in molar ratio) glass system was studied by non-isothermal methods using differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. DSC measurements were performed at different heating rates to study crystallization kinetics of the first crystallization reactions of the glasses. XRD analysis of tungsten-tellurite glasses heat-treated above the first crystallization temperatures revealed that the first crystallization peaks attributed to the α-TeO2 and γ-TeO2 crystalline phases for 0.90TeO2-0.10WO3 and 0.85TeO2-0.15WO 3 samples and α-TeO2 and WO3 crystalline phases for the 0.80TeO2-0.20WO3 sample. Avrami constants, n, calculated from Ozawa equation, were found between 1.14 and 1.44. The activation energies, EA, for the first crystallization reactions were determined by using the modified Kissinger equation as 379 kJ/mol, 288.1 kJ/mol and 228.8 kJ/mol, for 0.90TeO2-0.10WO3, 0.85TeO 2-0.15WO3 and 0.80TeO2-0.20WO3 glasses, respectively.

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Crystallization kinetics of the tungsten-tellurite glasses

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