Application of the Free Volume Concept to Glasses in the Ge-As-S System
The energy of hole formation E^sub h^, the hole volume V^sub h^, and the fraction f^sub g^ of fluctuation free volume for glasses in the Ge-As-S system are calculated from the data on the elastic moduli, the microhardness H, and the glass transition temperature T^sub g^. It is shown that the fractio...
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Published in | Glass physics and chemistry Vol. 28; no. 1; pp. 25 - 32 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Heidelberg
Springer Nature B.V
01.01.2002
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Subjects | |
Online Access | Get full text |
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Summary: | The energy of hole formation E^sub h^, the hole volume V^sub h^, and the fraction f^sub g^ of fluctuation free volume for glasses in the Ge-As-S system are calculated from the data on the elastic moduli, the microhardness H, and the glass transition temperature T^sub g^. It is shown that the fraction of fluctuation free volume in ternary glasses is considerably larger than that in arsenic chalcogenide glasses. For the glasses studied, the E^sub h^ energies fall in the range 13-18 kJ/mol and the hole volumes are equal to (7-84) × 10^sup -6^ m^sup 3^/mol. The concentration dependences of the elastic moduli and the parameters of the free volume theory for glasses in the As^sub 2^S^sub 3^-GeS^sub 2^ system are less pronounced than those for glasses in the As-S system with small coordination numbers of glass-former ions. This is explained by the topological transition observed in glasses of this system at a high germanium content. It is demonstrated that the parameters of the fluctuation free volume theory are related to the characteristics of the boson peak in the Raman spectra.[PUBLICATION ABSTRACT] |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 |
ISSN: | 1087-6596 1608-313X |
DOI: | 10.1023/A:1014245312282 |