NQR study of chalcogenide glasses Ge-As-Se

✍ Scribed by Olga Glotova; Irina Korneva; Nikolay Sinyavsky; Michal Ostafin; Boleslaw Nogaj

• Publisher: John Wiley and Sons
• Year: 2011
• Tongue: English
• Weight: 255 KB
• Volume: 49
• Category: Article
• ISSN: 0749-1581
• DOI: 10.1002/mrc.2758

✦ Synopsis

Abstract

A three‐component Ge‐As‐Se system is studied by the nuclear quadrupole resonance (NQR) method on ^75^As nuclei and by the nutation NQR spectroscopy. The NQR ^75^As spectra of the glasses Ge~0.021~As~0.375~Se~0.604~, Ge~0.043~As~0.348~Se~0.609~ and Ge~0.068~As~0.318~Se~0.614~reveal broad lines with two peaks assigned to the main structural unit of As~2~Se~3~. With increasing average coordination number (r̄), the spectrum signals are shifted towards higher frequencies. At r̄ > 2.54, the spectrum becomes complex, which is a consequence of formation of more complex molecular structures in the glasses of high content of germanium. At fixed frequencies the asymmetry parameter η of the samples studied is determined. Copyright © 2011 John Wiley & Sons, Ltd.