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

• Published in: Journal of physics. Condensed matter Vol. 21; no. 7; pp. 075105 - 075105 (7)
• Main Authors: Saiter, A, Saiter, J-M, Golovchak, R, Shpotyuk, M, Shpotyuk, O
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 18.02.2009; Institute of Physics; IOP Publishing [1989-....]
• 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; Glass transition; Differential scanning calorimetry; Arsenides selenides; Atomic arrangement; Free volume; Glass structure; Positron annihilation; Chalcogenide glasses
• ISSN: 0953-8984; 1361-648X
• DOI: 10.1088/0953-8984/21/7/075105

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.