Abstract.
The volumes and expansivities of four hydrous phonolite glasses and liquids have been measured by dilatometry from 300 K up to the glass transition and over a 50 K interval just above the glass transition. The partial molar volume of water is independent of the water content for the glass and liquid phases, with values of about 11.0±0.5 and 17.1±0.9 cm3/mol at 300 and 800 K, respectively. The partial molar thermal expansivity of water in phonolite glasses is about 8×10–5 K–1, a result similar to recently published values for different silicate compositions, and about 36.5×10–5 K–1 in phonolite liquids. The implications for melt density and water dissolution are discussed.
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Bouhifd, A.M., Whittington, A. & Richet, P. Partial molar volume of water in phonolitic glasses and liquids. Contrib Mineral Petrol 142, 235–243 (2001). https://doi.org/10.1007/s004100100286
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DOI: https://doi.org/10.1007/s004100100286