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Properties of SiO 2 in a high‐pressure fluorite structure phase
Author(s) -
Carlsson A. E.,
Ashcroft N. W.,
Williams A. R.
Publication year - 1984
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/gl011i006p00617
Subject(s) - fluorite , equation of state , quartz , phase (matter) , phase transition , materials science , mineralogy , crystal structure , shock (circulatory) , volume (thermodynamics) , compression (physics) , bulk modulus , condensed matter physics , thermodynamics , geology , physics , chemistry , crystallography , composite material , medicine , quantum mechanics , metallurgy
The equation of state and volume‐dependent band gap are calculated for SiO 2 in the fluorite crystal structure. The equation of state is in considerable disagreement with recent shock magnetic compression results. Its form also suggests that if SiO 2 is present in the earth's core in uncombined form it can only be so in relatively small amounts. The band‐overlap transition occurs at a density four times that of quartz at zero pressure.