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Hypersonic behaviour of bismuth germanium oxide (Bi 4 Ge 3 O 12 )
Author(s) -
Prieto C.,
Pelous J.,
Boissier M.,
Contreras L.
Publication year - 1989
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250200309
Subject(s) - germanium oxide , bismuth , germanium , hypersonic speed , brillouin scattering , attenuation , materials science , brillouin zone , phonon , oxide , raman scattering , optics , raman spectroscopy , condensed matter physics , mineralogy , chemistry , laser , physics , thermodynamics , optoelectronics , metallurgy , silicon
Brillouin scattering was performed between 80 and 300 K in order to study the hypersonic properties of Bi 4 Ge 3 O 12 crystals. The velocity and the attenuation of longitudinal acoustic phonons propagating along the [100] direction were measured for frequencies near 34 GHz. The Brillouin shift shows a variation with temperature which is five times lower than that observed in another bismuth germanium oxide, Bi 12 GeO 20 . The hypersound attenuation is also very low and seems to be independent of temperature.