Abstract
In situ, high-temperature Raman spectroscopy was used to study the Q n speciation in binary potassium silicate melts. Over 300 Raman spectra in the compositional range from 20 to 38 mol% K 2O were collected at 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 n species. The Δ H 0 associated with the speciation reaction 2 Q 3 = Q 4 + Q 2 was found to be 33.1 ± 7.3 kJ/mol.
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