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Quantitative Raman spectroscopy; speciation of Na-silicate glasses and melts

Wim J. Malfait, Valentina P. Zakaznova-Herzog and Werner E. Halter
Quantitative Raman spectroscopy; speciation of Na-silicate glasses and melts (in Amorphous materials; properties, structure, and durability, Grant S. Henderson (prefacer) and Daniel R. Neuville (prefacer))
American Mineralogist (October 2008) 93 (10): 1505-1518

Abstract

In situ, high-temperature Raman spectroscopy was used to study the Q (super n) speciation in binary Na-silicate glasses and melts. Over 300 Raman spectra in the compositional range from 25 to 40 mol% Na (sub 2) O were collected at room and high temperatures between 800 and 1200 K. Quantitative information on the relative abundances of species in melts was obtained from the Raman spectra through a quantification procedure that does not require any a priori assumptions about the line shapes or external calibration of the Raman scattering efficiencies for the various Q (super n) species. The Delta H degrees associated with the speciation reaction 2Q (super 3) = Q (super 4) +Q (super 2) was found to be 20.3+ or -7.9 kJ/mol. For a given temperature, the speciation is more disordered in sodium than in potassium silicate melts. Because of the smaller temperature dependence of the speciation in the sodium silicate system, the difference in the speciation for the sodium and potassium silicate system decreases with increasing temperature. In addition to the speciation data, the partial Raman spectra for the different species were obtained. The experimentally observed variation of the partial Raman spectra with temperature, and, to a minor extent, with composition, should stimulate future theoretical studies on the vibrational properties of silicate glasses and melts.


ISSN: 0003-004X
EISSN: 1945-3027
Coden: AMMIAY
Serial Title: American Mineralogist
Serial Volume: 93
Serial Issue: 10
Title: Quantitative Raman spectroscopy; speciation of Na-silicate glasses and melts
Title: Amorphous materials; properties, structure, and durability
Author(s): Malfait, Wim J.Zakaznova-Herzog, Valentina P.Halter, Werner E.
Author(s): Henderson, Grant S.prefacer
Author(s): Neuville, Daniel R.prefacer
Affiliation: ETH Zurich, Institute of Isotope Geochemistry and Mineral Resources, Zurich, Switzerland
Affiliation: University of Toronto, Department of Geology, Toronto, ON, Canada
Pages: 1505-1518
Published: 200810
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 42
Accession Number: 2009-001460
Categories: General geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 7 tables
Secondary Affiliation: CNRS-IPGP, FRA, France
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200901
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