Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 90: Issue 2
Viscosity and structural relaxation of 15Na2O· x MgO·(10− x )CaO·75SiO2 glasses
Authors:
Mária Chromčiková Alexander Dubček University of Trenčín, and RONA Lednické Rovne Vitrum Laugaricio (VILA) — Joint Glass Center of the Institute of Inorganic Chemistry SAS Študentská 2 Trenčín 911 50 Slovak Republic

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M. Liška Alexander Dubček University of Trenčín, and RONA Lednické Rovne Vitrum Laugaricio (VILA) — Joint Glass Center of the Institute of Inorganic Chemistry SAS Študentská 2 Trenčín 911 50 Slovak Republic

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Pages:
421–429
Online Publication Date:
26 Feb 2007
Publication Date:
01 Nov 2007
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-006-7976-5
Keywords:
glass; glass transition; relaxation phenomena; thermomechanical analysis
Restricted access

Abstract  

Temperature dependence of viscosity of title glasses (x=0, 2, 4, 6, 8, 10, abbreviated as M0, M2, M4, M6, M8, and M10, respectively) was measured by rotational viscometry (high temperature region: 102−106.5 dPas) and thermomechanical analysis (low temperature region: 108.5−1011.5 dPas) and described by the Vogel-Fulcher-Tammann equation. The MgO/CaO equimolar substitution (i.e. the increasing x value) smoothly shifts the high temperature viscosity to higher values. In the low temperature region the mixed alkali effect is demonstrated, and the highest viscosities are observed for the glasses M0 and M10. In the low temperature range the activation energy of viscous flow linearly decreases with the increasing x value (Eact/kJ mol−1=479−9.0x). No significant dependence of activation energy on x was found in the high temperature range (Eact/kJ mol−1=238.1±4.2). The structural relaxation was measured by thermomechanical experiment and theoretically interpreted in the frame of Tool-Narayanaswamy-Mazurin’s model. The broadening of the relaxation time spectrum was observed for the calcium-magnesium glasses in comparison with the pure calcium or magnesium glasses.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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