Static amorphization of anorthite at 300 K and comparison with diaplectic glass

Details Static amorphization of anorthite at 300 K and comparison with diaplectic glass Static amorphization of anorthite at 300 K and comparison with diaplectic glass

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989natur.338..413w&link_type=abstract

Nature (ISSN 0028-0836), vol. 338, March 30, 1989, p. 413-415. Research supported by NSF.

Computer Science

56

Amorphous Materials, Glass, Impact Melts, Meteoritic Damage, Vitrification, Coesite, Feldspars, Quartz, Shock Loads, Silicon Dioxide

Scientific paper

It is reported here that crystalline anorthite (CaAl2Si2O8) becomes amorphous at static pressures between 22 and 28 GPa at 300 K. The amorphization is associated with a pressure-induced increase in the coordination of silicon and aluminum by oxygen, from fourfold to five- and sixfold. The increase in coordination appears as the sample vitrifies at pressure; on decompression, the coordination reverts to fourfold. The vitrification is spatially heterogeneous, and may be crystallographically controlled. The formation of glass from crystalline material under static conditions at 300 K indicates that the high strain rates and temperatures associated with shock compression are not required for the creation of glasses without fusion.

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