ChemInform Abstract: ON THE FINE STRUCTURE IN THE INFRARED SPECTRA OF CLEAR NATURAL QUARTZ, AMETHYST, CITRINE AND SYNTHETIC QUARTZ CRYSTALS IN THE 3400 CM-1 REGION

D. CHAKRABORTY; G. LEHMANN

doi:10.1002/chin.197822004

ChemInform Abstract: ON THE FINE STRUCTURE IN THE INFRARED SPECTRA OF CLEAR NATURAL QUARTZ, AMETHYST, CITRINE AND SYNTHETIC QUARTZ CRYSTALS IN THE 3400 CM-1 REGION

Chemischer Informationsdienst ◽

10.1002/chin.197822004 ◽

1978 ◽

Vol 9 (22) ◽

Author(s):

D. CHAKRABORTY ◽

G. LEHMANN

Keyword(s):

Fine Structure ◽

Infrared Spectra ◽

Natural Quartz ◽

Quartz Crystals ◽

Synthetic Quartz

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On the Fine Structure in the Infrared Spectra of Clear Natural Quartz, Amethyst, Citrine and Synthetic Quartz Crystals in the 3400 cm-1 Region

Zeitschrift für Naturforschung A ◽

10.1515/zna-1978-0306 ◽

1978 ◽

Vol 33 (3) ◽

pp. 290-293 ◽

Cited By ~ 5

Author(s):

Dipak Chakraborty ◽

Gerhard Lehmann

Keyword(s):

Fine Structure ◽

Hydrogen Concentration ◽

Infrared Spectra ◽

Natural Quartz ◽

Quartz Crystals ◽

Synthetic Quartz ◽

Intensity Ratios

AbstractThe fractional intensities of different infrared vibration bands due to hydrogen impurities have been studied in clear natural quartz, amethyst, citrine and synthetic quartz. Integral absorptions of the different bands were found to increase linearly with total hydrogen concentration. The differences in intensity ratios for some prominent bands are distinctive for the type of quartz in some cases. The ratios of isotropic to anisotropic absorption from hydrogen impurities were found to increase with total hydrogen concentration.

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Preparation of Synthetic Quartz Aggregates under Pressure

MRS Proceedings ◽

10.1557/proc-251-139 ◽

1991 ◽

Vol 251 ◽

Author(s):

F. C. Luan ◽

M. S. Paterson

Keyword(s):

High Temperature ◽

Crack Propagation ◽

Creep Strength ◽

Natural Quartz ◽

Quartz Crystals ◽

Synthetic Quartz ◽

Self Diffusion ◽

Hydrolytic Process ◽

Quartz Aggregates ◽

Strong Contrast

ABSTRACTIn 1965 Griggs and Blacic [1,2] proposed that there is a “hydrolytic weakening” process in quartz and silicates whereby the breaking of Si-O bonds, involved in the movement of dislocations, is facilitated by the presence of water. This proposal aimed to explain the observed dramatic weakening of quartz crystals when they are exposed to water in tests at high temperature, as well as the observed strong contrast in creep strength between dry natural quartz crystals and rapidly-grown synthetic quartz crystals containing traces of water. Such a “hydrolytic” process may also underlie the observed effects of water in accelerating other phenomena such as self-diffusion of oxygen in quartz, aluminium-silicon ordering in feldspars, slow crack propagation in silicates, and recrystallization in quartz. A review of this field is given in Reference 3.

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