Kinetics of enthalphy relaxation at the glass transition in ternary tellurite glasses

Kazuya Aida, Yasuhiko Benino, Vesselin Dimitrov, Takayuki Komatsu, Ryuji Sato

Research output: Contribution to journalArticle

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Abstract

The kinetics of enthalpy relaxation (recovery) at the glass transition in xK2O·(20 - x)MgO·80TeO2 glasses has been examined from heat capacity measurements using differential scanning calorimetry to clarify the features of the structural relaxation in ternary TeO2-based glasses. Ternary glasses such as 10K2O·10MgO·80TeO2 show high thermal resistance against crystallization compared with binary glasses. The degree of fragility m estimated from the activation energy for viscous flow Eη and the glass transition temperature Tg is m = 55-62, indicating a fragile character in TeO2-based glasses. Large heat capacity changes of 43.1-48.2 J·mol-1·K-1 are also observed at the glass transition. The activation energy for enthalpy relaxation ΔH is evaluated from the cooling rate dependence of the limiting fictive temperature, and values of ΔH = 897-1268 kJ·mol-1 are obtained. Negative deviation from additivity in ΔH is also observed. Values of the Kovacs-Aklonis-Huchinson-Ramos (KAHR) parameter θ estimated from ΔH and Tg are 0.33-0.42 K-1. It has been proposed that ternary glasses have more homogeneous and constrained glass structure compared with binary glasses.

Original languageEnglish
Pages (from-to)1192-1198
Number of pages7
JournalJournal of the American Ceramic Society
Volume83
Issue number5
Publication statusPublished - 2000
Externally publishedYes

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Glass transition
Glass
Kinetics
Specific heat
Enthalpy
Activation energy
Structural relaxation
tellurous acid
Viscous flow
Crystallization
Heat resistance
Differential scanning calorimetry
Cooling
Recovery

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Kinetics of enthalphy relaxation at the glass transition in ternary tellurite glasses. / Aida, Kazuya; Benino, Yasuhiko; Dimitrov, Vesselin; Komatsu, Takayuki; Sato, Ryuji.

In: Journal of the American Ceramic Society, Vol. 83, No. 5, 2000, p. 1192-1198.

Research output: Contribution to journalArticle

Aida, Kazuya ; Benino, Yasuhiko ; Dimitrov, Vesselin ; Komatsu, Takayuki ; Sato, Ryuji. / Kinetics of enthalphy relaxation at the glass transition in ternary tellurite glasses. In: Journal of the American Ceramic Society. 2000 ; Vol. 83, No. 5. pp. 1192-1198.
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