Shocked quartz; a 29 Si magic-angle-spinning nuclear magnetic resonance study

Other| December 01, 1998 Shocked quartz; a 29 Si magic-angle-spinning nuclear magnetic resonance study Peter S. Fiske; Peter S. Fiske Lawrence Livermore National Laboratory, Physics and Space Technology Directorate, Livermore, CA, United States Search for other works by this author on: GSW Google Scholar William J. Nellis; William J. Nellis Search for other works by this author on: GSW Google Scholar Zhi Xu; Zhi Xu Search for other works by this author on: GSW Google Scholar Jonathan F. Stebbins Jonathan F. Stebbins Search for other works by this author on: GSW Google Scholar American Mineralogist (1998) 83 (11-12_Part_1): 1285–1292. https://doi.org/10.2138/am-1998-11-1217 Article history first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation Peter S. Fiske, William J. Nellis, Zhi Xu, Jonathan F. Stebbins; Shocked quartz; a 29 Si magic-angle-spinning nuclear magnetic resonance study. American Mineralogist 1998;; 83 (11-12_Part_1): 1285–1292. doi: https://doi.org/10.2138/am-1998-11-1217 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyAmerican Mineralogist Search Advanced Search Abstract Quantitative 29 Si NMR spectra of single-crystal alpha -quartz, shock compressed to 12-38 GPa and recovered, provide new information about the complex response of quartz to shock loading. Spectra from samples recovered from shock pressures of 12-20 GPa show a broadening of the 29 Si NMR peak and the development of asymmetry toward lower NMR frequency (indicating an increase in the mean Si-O-Si intertetrahedral bond angle). NMR spectra of samples shock compressed above approximately 25 GPa show increasing amounts of a separate amorphous phase of SiO 2 with a mean Si-O-Si bond angle roughly 5 degrees narrower, and 10-15% denser, than fused SiO 2 . Small amounts of crystalline material remain with a mean Si-O-Si bond angle up to 3 degrees larger than unshocked alpha -quartz. The recovery of dense glass indicates that post-shock temperatures were sufficiently low to also preserve stishovite, had any been created in our experiments. The paucity of stishovite or (super [6]) Si in an amorphous phase in our recovered samples suggests that the formation of stable, high-coordinated Si is kinetically hindered in shock compression experiments up to about 35-40 GPa, except in regions of high temperature, such as planar deformation features (PDFs), microfaults (pseudotachylites), or voids. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.