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Recovery of stishovite-structure at ambient conditions out of shock-generated amorphous silica

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