Skip to Main Content
GEOREF RECORD

The nucleation and growth of polycrystalline quartz; pressure effect from 0.05 to 3 GPa

Wuu-Liang Huang
The nucleation and growth of polycrystalline quartz; pressure effect from 0.05 to 3 GPa (in Ninth international symposium on Experimental mineralogy, petrology and geochemistry, Peter Ulmer (convener))
European Journal of Mineralogy (October 2003) 15 (5): 843-853

Abstract

Polycrystalline quartz was formed from amorphous silica in seawater and distilled water at temperatures and pressures ranging from 50 to 450 degrees C and 50 MPa to 3 GPa, respectively. The data at 100 and 200 MPa pressures can be reasonably modeled using Avrami's nucleation and growth equation. Experimental results reveal a dramatic pressure effect on transformation rate, which increases approximately by five orders of magnitude as pressure increases from 50 MPa to 3 GPa at 400 degrees C. The effect is more prominent in a low-pressure regime than in a high-pressure regime; the transition pressure between the high- and low-pressure regimes is temperature-dependent. The pressure can significantly enhance both nucleation and growth rates although the effect is stronger on nucleation than on growth. This finding leads to the successful synthesis of polycrystalline quartz at a temperature as low as 50 degrees C at 3 GPa in a few days, and helps predict its formation at ambient temperature and higher pressures. SEM measurements show that grain sizes decrease significantly with increasing pressure, giving rise to a new method for synthesizing nano-size (<100 nm) polycrystalline quartz in neutral solutions.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 15
Serial Issue: 5
Title: The nucleation and growth of polycrystalline quartz; pressure effect from 0.05 to 3 GPa
Title: Ninth international symposium on Experimental mineralogy, petrology and geochemistry
Author(s): Huang, Wuu-Liang
Author(s): Ulmer, Peterconvener
Affiliation: National Taiwan University, Department of Geosciences, Taipei, Taiwan
Affiliation: ETH Zurich, Institute for Mineralogy, Zurich, Switzerland
Pages: 843-853
Published: 200310
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
Meeting name: Ninth international symposium on Experimental mineralogy, petrology and geochemistry
Meeting location: Zurich, CHE, Switzerland
Meeting date: 20020324March 24-27, 2002
References: 63
Accession Number: 2004-020039
Categories: Mineralogy of silicates
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200406
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal