| Description |
102 leaves in various foliations : illustrations, photographs ; 29 cm |
| Summary |
"The introduction of Ag into Si-As-Te glasses permits the incorporation of Se, otherwise volatile and/or degradable as a constituent in Si-containing chalcogenide glasses. Si-As-Ag-Te-Se glasses exhibit much higher softening ranges and glass transition temperatures than encountered in known chalcogenide systems. A glass Si₃₅As₁₅Ag₁₀Te₂₀Se₂₀ had the viscosity log [eta]=13 at about 500°C, as compared to 370°C for the base glass Si₃₅As₂₅Te₄₀, the viscosity of log [eta]=9.8 at about 560°C, as compared to 442°C for the base glass Si₃₅As₂₅Te₄₀. Phase separation occurs in the system Si-As-Ag-Te-Se and becomes manifest in two glass transitions indicated by changes in the slopes of the expansion curves and breaks in the softening point-composition curves. The existence and behavior of Si-As-Ag-Te-Se glasses suggests the possible development of higher Tg infrared transparencies and higher Tg low band gap semiconductor glasses than described so far"--Abstract, leaf ii. |
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