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American Mineralogist; November 2006; v. 91; no. 11-12; p. 1857-1862; DOI: 10.2138/am.2006.2015
© 2006 Mineralogical Society of America
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Recovery of stishovite-structure at ambient conditions out of shock-generated amorphous silica

Oliver Tschauner1,3,*, Sheng-Nian Luo2, Paul D. Asimow3 and Thomas J. Ahrens4

1 High Pressure Science and Engineering Center and Department of Physics, University of Nevada, Las Vegas, Nevada 89154, U.S.A.
2 P-24 Plasma Physics, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, U.S.A.
3 Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125, U.S.A.
4 Lindhurst Laboratory of Experimental Geophysics, Seismological Laboratory, California Institute of Technology, Pasadena, California 91125, U.S.A.

Correspondence: * E-mail: olivert{at}physics.unlv.edu

We show that bulk amorphous silica recovered from shock-wave experiments on quartz to 57 GPa is not a true glass but rather keeps a large degree of long-range structural information that can be recovered by static cold recompression to 13 GPa. At this pressure, shock-retrieved silica assumes the structure of crystalline stishovite. A minor amount of material recovers the structure of a recently discovered new silica polymorph.

Key Words: Meteorite • shock • phase transition • amorphous to solid • XRD data • stishovite • high pressure




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O. Tschauner, P. D. Asimow, N. Kostandova, T. J. Ahrens, C. Ma, S. Sinogeikin, Z. Liu, S. Fakra, and N. Tamura
Ultrafast growth of wadsleyite in shock-produced melts and its implications for early solar system impact processes
PNAS, August 18, 2009; 106(33): 13691 - 13695.
[Abstract] [Full Text] [PDF]


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