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High‐pressure Raman study on type‐I germanium clathrate
Author(s) -
Fukushima T.,
Kume T.,
Sasaki S.,
Shimizu H.,
Fukuoka H.,
Yamanaka S.
Publication year - 2007
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.200672515
Subject(s) - raman spectroscopy , clathrate hydrate , bar (unit) , germanium , raman scattering , analytical chemistry (journal) , chemistry , crystallography , materials science , optics , silicon , geology , physics , hydrate , optoelectronics , oceanography , organic chemistry , chromatography
Abstract Raman scattering measurements of the type‐I Ge clathrtate, Ba 8 Ge 43 , have been performed at 1 bar and room temperature, and under high‐pressures up to 22 GPa. Because of vacancies which exist in Ba 8 Ge 43 , the Raman spectrum at 1 bar was found to be different from that of Si clathrate. Low‐frequency vibrational modes associated with Ba atoms were found around 35–75 cm –1 and the Ge‐framework Raman bands were observed around 80–150 cm –1 comparable to the typical clathrate Ba 8 Si 46 . For these regions, spectral shapes are very similar to that of Ba 8 Si 46 . However, for the region above 150 cm –1 , all the peaks were considerably weak in intensity, in contrast to Ba 8 Si 46 . In the data obtained at high pressures, the spectral changes were observed around 8.0 GPa and 22 GPa. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)