Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session H38: Materials in Extremes: Phase Transitions II
2:30 PM–5:18 PM,
Tuesday, March 6, 2018
LACC Room: 501A
Sponsoring Units: DCOMP GSCCM DMP
Chair: J. Matthew Lane, Sandia National Laboratories
Abstract: H38.00006 : In-situ x-ray diffraction of SiO2 and TiO2 under shock compression*
3:30 PM–3:42 PM
(Washington State Univeristy)
SiO2 and TiO2 are known to undergo phase transitions under shock compression. The nature of these transitions and the resulting high-pressure phases are of fundamental interest for understanding the dynamic response of minerals, for characterizing natural impact sites, and for understanding high-pressure phases of planetary interiors. In this study, in situ x-ray diffraction experiments on shock-compressed SiO2 and TiO2 were conducted at the Dynamic Compression Sector of the Advanced Photon Source. The lattice-level structure was investigated through time-resolved x-ray diffraction measurements on samples reaching a peak stress ranging from 12 to 70 GPa. For SiO2, we have examined natural low-porosity polycrystals as well as fused silica. For TiO2, we have studied single crystals in different orientations. Our results provide direct constraints on the nature of the high-pressure phases formed under shock compression in these materials.
*This work was supported by NSF and DTRA.
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