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Sound Speed in Glassy As x Se 1− x ( x = 0.4, 0.5, and 0.6) by Inelastic X‐Ray Scattering
Author(s) -
Inui Masanori,
Matsuda Kazuhiro,
Hosokawa Shinya,
Nakajima Yoichi,
Tsutsui Satoshi,
Ishikawa Daisuke,
Baron Alfred Q. R.
Publication year - 2020
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.202000134
Subject(s) - speed of sound , rigidity (electromagnetism) , scattering , energy transfer , materials science , excitation , momentum transfer , inelastic scattering , x ray , acoustic dispersion , dispersion (optics) , physics , optics , atomic physics , acoustics , composite material , quantum mechanics
Inelastic X‐ray scattering (IXS) measurements are carried out for glassyAs 0.4 Se 0.6 ,As 0.5 Se 0.5 , andAs 0.6 Se 0.4to 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 liquidAs 0.4 Se 0.6near 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 glassyAs 0.4 Se 0.6is most stable.