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Abstract
Inelastic X‐ray scattering (IXS) measurements are carried out for glassy , , and to investigate atomic dynamics in the glasses. Momentum transfer (Q) dependence of the acoustic excitation energy in each glass follows the ultrasonic sound speed. No positive dispersion is observed in these glasses although liquid near the melting point shows it. The stoichiometric glass shows a maximum sound speed and the speed decreases with increasing As concentration. The results seem to be correlated with a prediction by rigidity theory that glassy is most stable.
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