Statistics – Computation
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988gecoa..52..283k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 52, Issue 2, pp.283-293
Statistics
Computation
16
Scientific paper
Longitudinal acoustic velocities have been measured for liquids in the system Na 2 O---Al 2 O 3 ---SiO 2 spanning much of the composition range Na 2 SiO 3 ---NaAlSiO 4 ---SiO 2 . Measurements were made at temperatures between 1185°C and 1620°C, using the technique of ultrasonic interferometry. Sound speeds, and therefore bulk moduli, show a general increase with increasing alumina content. This trend is explained qualitatively in terms of a molecular model of the effect of sodium and aluminum on the structure and dominant compression mechanism of silicate liquids. We present a computational model for estimation of both sound velocities and isothermal compressibilities within much of the compositional ternary Na 2 SiO 3 ---NaAlSiO 4 ---SiO 2 . Implications of these results for the high pressure anhydrous melting curve of albite (NaAlSi 3 O 8 ) are also discussed. Acoustic velocities are presented for liquid sodium chloride in order to provide a basis for comparison with data from other laboratories.
Carmichael Ian S. E.
Kress Victor C.
Williams Quentin
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