Abstract
ONLY a few of the techniques available for studying the thermodynamic properties of ionic melt mixtures1 can be used to study mixtures of technological interest above 1,000° C. Volumes of mixing of the sodium metaphosphate: potassium metaphosphate system have been measured by one of us2, and this technique could be used to study phosphate–silicate melts of interest to steelmakers. The thermodynamic ideality of a molten system can also be tested by measuring the surface tension of the molten mixtures and comparing these with the predictions of Guggenheim's ideal equation3,4. We have used this method for studying molten phosphate mixtures and shall here describe the results for the sodium metaphosphate : potassium metaphosphate system.
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References
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Bradbury, B. T., thesis, Univ. Sheffield (1958). Bradbury, B. T., and Maddocks, W. R., J. Soc. Glass Tech., 43, 325 (1959).
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NIJJHAR, R., WILLIAMS, D. Surface Tensions of Molten Mixtures and Thermodynamic Ideality. Nature 211, 407–408 (1966). https://doi.org/10.1038/211407a0
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DOI: https://doi.org/10.1038/211407a0
