Shock behavior of zircon - Phase transition to scheelite structure and decomposition

Details Shock behavior of zircon - Phase transition to scheelite structure and decomposition Shock behavior of zircon - Phase transition to scheelite structure and decomposition

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985e%26psl..72..433k&link_type=abstract

Earth and Planetary Science Letters (ISSN 0012-821X), vol. 72, no. 4, March 1985, p. 433-439. Research supported by the Science

Computer Science

29

Metamorphism (Geology), Scheelite, Zirconium Oxides, Crystal Structure, Electron Microscopy, High Pressure, Infrared Spectroscopy, Phase Transformations, Shock Waves, Single Crystals, X Ray Analysis

Scientific paper

The effect of shock waves on the phase transformations in zircon (ZrSiO4) is investigated by examining shock-loaded materials by means of X-ray diffraction, transmission electron microscopy, and infrared spectroscopy. Both single-crystal and powdered specimens of zircon are shocked to peak pressures between 30 and 94 GPa using the gun method. Transformation from the zircon structure to the scheelite structure starts above 30 GPa, and complete transformation is achieved above 53 GPa for single-crystal specimens. The recovered scheelite-type ZrSiO4 reverts to the zircon-type ZrSiO4 after heating to 1200 C at the rate of 40 C/minute at room pressure. A trace of tetragonal ZrO2 is detected as a decomposition product in the single-crystal specimen shocked to 94 GPa, and further confirmed in a powdered specimen shocked to 53 GPa, where a high temperature is expected due to shock compression of porous material.

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