Vibrational thresholds near critical average coordination in alloy network glasses

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Abstract
Experimental evidence for vibrational thresholds in network glasses recently predicted theoretically is discussed. A number of thresholds are observed, some of which are ascribed to phase separation and some of which may arise from intrinsic network mechanical properties. The glasses are binary and ternary chalcogenide alloys of Ge and Sn with S and Se, and the experiments are either acoustical or optical (infrared absorption and Raman scattering), with variable composition and external pressure. The first direct evidence for an electrical coherence length in a network glass is identified and analyzed.