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Hydrogen speciation in synthetic quartz

Aines, Roger D. and Kirby, Stephen H. and Rossman, George R. (1984) Hydrogen speciation in synthetic quartz. Physics and Chemistry of Minerals, 11 (5). pp. 204-212. ISSN 0342-1791. doi:10.1007/BF00308135.

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The dominant hydrogen impurity in synthetic quartz is molecular H_2O. H-OH groups also occur, but there is no direct evidence for the hydrolysis of Si-O-Si bonds to yield Si-OH HO-Si groups. Molecular H_2O concentrations in the synthetic quartz crystals studied range from less than 10 to 3,300 ppm (H/Si), and decrease smoothly by up to an order of magnitude with distance away from the seed. OH− concentrations range from 96 to 715 ppm, and rise smoothly with distance away from the seed by up to a factor of three. The observed OH− is probably all associated with cationic impurities, as in natural quartz. Molecular H_2O is the dominant initial hydrogen impurity in weak quartz. The hydrolytic weakening of quartz may be caused by the transformation H_2O + Si-O-Si → 2SiOH, but this may be a transitory change with the SiOH groups recombining to form H_2O, and the average SiOH concentration remaining very low. Synthetic quartz is strengthened when the H_2O is accumulated into fluid inclusions and cannot react with the quartz framework.

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Rossman, George R.0000-0002-4571-6884
Additional Information:© 1984 Springer-Verlag. Received September 30, 1983. Synthetic quartz was obtained from Bell Laboratories, Murray Hill, New Jersey, courtesy of David Fraser, Robert Laudise, and Ernie Kolb. Kurt Nassau (Bell Laboratories) provided helpful insight into the growth of synthetic quartz. Art Boettcher (UCLA) provided the hydrous SiO_2 glass and Ed Stolper (Caltech) provided its spectrum and water concentration. This work was supported in part by NSF Grant EAR 7919987 AO1.
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NSFEAR 7919987 AO1
Issue or Number:5
Record Number:CaltechAUTHORS:20130724-090733773
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ID Code:39547
Deposited By: Tony Diaz
Deposited On:20 Sep 2013 23:27
Last Modified:09 Nov 2021 23:45

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