Characterization of amorphous material in shocked quartz by NMR spectroscopy

Conference · Sun Jul 10 04:00:00 EDT 1994 · AIP Conference Proceedings (American Institute of Physics); (United States)

DOI:https://doi.org/10.1063/1.46122· OSTI ID:6976285

Assink, R A; Boslough, M B; Cygan, R T ^[1]

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1. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)

Nuclear magnetic resonance (NMR) analysis of the recovered products from a series of controlled explosive shock-loading experiments on quartz powders was performed to investigate shock-induced amorphization processes. Silicon-29 NMR spectroscopy is an excellent probe of the local bonding environment of silicon in minerals and is capable of detecting and characterizing amorphous and disordered components. NMR spectra obtained for the recovered material exhibit a narrow resonance associated with the shocked crystalline material, and a broad component consistent with an amorphous phase despite the absence of evidence for glass from optical microscopy. The NMR measurements were performed over a range of recycle times from 1 to 3[times]10[sup 5] s. The results demonstrate that the magnetization in both the crystalline and amorphous material follows power-law behavior as a function of recycle time. The amorphous component dominates the spectra for short NMR recycle times due to its shorter relaxation time relative to the crystalline material. Fractal analysis of the power-law relations suggests a fractal dimension of 2 for the amorphous phase and 3 for the crystalline phase. [copyright] American Institute of Physics

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6976285
• Report Number(s): CONF-921145--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 309:1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360602* -- Other Materials-- Structure & Phase Studies
AMORPHOUS STATE
FRACTALS
IMPACT SHOCK
MAGNETIZATION
MINERALS
NMR SPECTRA
OXIDE MINERALS
QUARTZ
SHOCK WAVES
SPECTRA
VERY HIGH PRESSURE