Thermochemical study of glasses in the system NaAlSi 3 O 8 -KAlSi 3 O 8 -Si 4 O 8 and the join Na 1.6 Al 1.6 Si 2.4 O 8 -K 1.6 Al 1.6 Si 2.4 O 8

Details Thermochemical study of glasses in the system NaAlSi 3 O 8 -KAlSi 3 O 8 -Si 4 O 8 and the join Na 1.6 Al 1.6 Si 2.4 O 8 -K 1.6 Al 1.6 Si 2.4 O 8 Thermochemical study of glasses in the system NaAlSi 3 O 8 -KAlSi 3 O 8 -Si 4 O 8 and the join Na 1.6 Al 1.6 Si 2.4 O 8 -K 1.6 Al 1.6 Si 2.4 O 8

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48..513h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 48, Issue 3, pp.513-522

Computer Science

5

Scientific paper

Enthalpies of solution in 2PbO · B 2 O 3 at 981 K have been measured for glasses in the system albite-orthoclase-silica and along the join Na 1.6 Al 1.6 Si 2.4 O 8 -K 1.6 Al 1.6 Si 2.4 O 8 . The join KAlSi 3 O 8 -Si 4 O 8 shows zero heat of mixing similar to that found previously for NaAlSi 3 O 8 -Si 4 O 8 glasses. Albite-orthoclase glasses show negative heats of mixing symmetric about Ab 50 Or 50 ( W n = - 2.4 ± 0.8 kcal). Negative heats of (Na, K) mixing are also found at Si /( Si + Al ) = 0.6. Ternary excess enthalpies of mixing in the glassy system Ab-Or-4Q are positive but rarely exceed 1 kcal mol -1 . Using earlier studies of the thermodynamic properties of the crystals, the present calorimetric data and the "two-lattice" entropy model, the albite-orthoclase phase diagram is calculated in good agreement with experimental data. Attempts to calculate albite-silica and orthoclase-silica phase diagrams reveal complexities probably related to significant (but unknown) mutual solid solubility between cristobalite and alkali feldspar and to the very small heat and entropy of fusion of SiO 2 .

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