Journal
JOURNAL OF PHYSICAL CHEMISTRY C
Volume 114, Issue 18, Pages 8601-8608Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp1014143
Keywords
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Funding
- NSF [DMR-0906070]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [906070] Funding Source: National Science Foundation
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High-resolution Se-77 MAS NMR spectroscopy has been conducted at 11.7 T to investigate the short-and intermediate- range structure and chemical order in binary GexSe100-x glasses with 5 <= x <= 33.33. Four distinct Se environments are observed for the first time, corresponding to Se-Se-Se and Ge-Se-Se linkages as well as Ge-Se-Ge sites where the Se atom is shared by two GeSe4 tetrahedra in either corner-sharing or edge-sharing configuration. Assignments of corner and edge-shared tetrahedra were made based on the Se-77 MAS NMR spectrum of crystalline beta-GeSe2. Analysis of the compositional variation of the relative concentrations of these Se sites indicates that the structure of GexSe100-x. glasses in this composition range can be described as a randomly interconnected network of GeSe4 tetrahedra and chains of Se atoms. The implications of this structural model are discussed in relation to the composition dependence of the glass-forming ability and kinetic fragility of the corresponding parent liquids.
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