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Dynamics of an Anisotropic Metaphosphate LiNaKCsPO 3 Glass by Inelastic X‐Ray Scattering
Author(s) -
Hosokawa Shinya,
Inaba Seiji,
Uchiyama Hiroshi,
Tsutsui Satoshi
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.202000172
Subject(s) - quasielastic scattering , scattering , inelastic scattering , quasielastic neutron scattering , phonon , anisotropy , phosphate glass , condensed matter physics , momentum transfer , metaphosphate , excitation , materials science , physics , x ray raman scattering , molecular physics , atomic physics , inelastic neutron scattering , optics , chemistry , doping , organic chemistry , phosphate , quantum mechanics
To clarify the mechanism of the entropic shrinkage of a metaphosphate LiNaKCsPO 3 glass, high‐resolution inelastic X‐ray scattering is carried out in the momentum transfer ( Q ) range from 1.6 to 15.9 nm −1 by changing the stretched sample rod directions perpendicular and parallel to the X‐ray scattering plane. Phonon excitations are found only in a low Q range below about 3 nm −1 , and the so‐called Boson peaks are observed in the Q region beyond 5.6 nm −1 . These excitations exhibit mostly no differences in the rod direction. A spectral enhancement at the prepeak position in the total X‐ray scattering spectrum is due to the quasielastic contributions. The direction difference in the width of the quasielastic peak becomes largely broadened near the prepeak region, which may be owing to a low excitation energy of the phosphate chains across the chain direction.