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Elastic wave velocities of high density pressure‐induced amorphous GeO 2
Author(s) -
Fujisawa H.,
Ito E.,
Ohtaka O.,
Yamanaka T.
Publication year - 1994
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/94gl01013
Subject(s) - quartz , amorphous solid , crystal (programming language) , materials science , analytical chemistry (journal) , phase (matter) , mineralogy , geology , condensed matter physics , composite material , crystallography , physics , chemistry , chromatography , quantum mechanics , computer science , programming language
Two samples of amorphous GeO 2 were prepared at room temperature by compression of α ‐quartz type crystals at 13 and 20GPa. The former sample has a density of 4.42(6) Mg/m³ and the latter 5.34(2) Mg/m³. The elastic wave velocities, ν p and ν s of each sample were measured under pressures up to 4GPa at room temperature. The results are: (1) Both ν p and ν s are faster in the sample with higher density. (2) Even the velocities of the sample with lower density are faster than those of both α ‐quartz type crystal and a conventional amorphous phase whose density is less than 4Mg/m³. Since the pressure derivative of ν p is larger than that of ν s , the difference between ν p and ν s becomes greater with increasing pressure.