Cooperative rearranging region size and free volume in As–Se glasses

Glasses of the As-Se system have been used as model objects of the covalent disordered inorganic polymers to investigate the correlation between the cooperative rearranging region (CRR) size determined at the glass transition temperature and the free volume fraction in the glassy state. The CRR size...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2009-02, Vol.21 (7), p.075105-075105 (7)
Main Authors: Saiter, A, Saiter, J-M, Golovchak, R, Shpotyuk, M, Shpotyuk, O
Format: Article
Language:English
Subjects:
Condensed Matter
Condensed matter: structure, mechanical and thermal properties
Disordered solids
Exact sciences and technology
Glasses
Materials Science
Physics
Structure of solids and liquids
crystallography
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Summary:Glasses of the As-Se system have been used as model objects of the covalent disordered inorganic polymers to investigate the correlation between the cooperative rearranging region (CRR) size determined at the glass transition temperature and the free volume fraction in the glassy state. The CRR size has been determined using temperature modulated differential scanning calorimetry data according to Donth's approach, while the free volume fraction in the investigated materials has been estimated using positron annihilation lifetime spectroscopy data. The obtained results testify that the appearance of open-volume defects greater than 80 Å(3) leads to a significant decrease in the CRR size.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/21/7/075105