Structure, topology and chemical order in Ge-As-Te glasses: A high-energy x-ray diffraction study
Journal of Physics Condensed Matter, cilt.22, sa.40, 2010 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 22 Sayı: 40
- Basım Tarihi: 2010
- Doi Numarası: 10.1088/0953-8984/22/40/405401
- Dergi Adı: Journal of Physics Condensed Matter
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
- Boğaziçi Üniversitesi Adresli: Hayır
Özet
High-energy x-ray diffraction is employed to study the atomic structure of bulk GexAs2xTe100-3x glasses with compositions in the range 25 ≤ 3x ≤ 70. The coordination environments of Te atoms suggest significant violation of chemical order in these glasses. Analyses of the nearest-neighbor coordination environments and the parameters for the first sharp diffraction peak indicate that these telluride glasses are structurally and chemically more disordered as compared with their sulfide or selenide analogs. The compositional evolution of the structural parameters is shown to be consistent with the corresponding variation in molar volume and glass transition temperature. © 2010 IOP Publishing Ltd.