Other
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980gecoa..44.1409n&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 44, Issue 10, pp.1409-1423
Other
30
Scientific paper
Enthalpies of solution in 2PbO· B 2 O 3 at 712°C have been measured for glasses in the systems albite anorthite diopside, NaAlO 2 -SiO 2 , Ca 0.5 AlO 2 -SiO 2 and albite-anorthite-quartz. The systems albite-anorthite and diopside-anorthite show substantial negative enthalpies of mixing, albite-diopside shows significant positive heats of mixing. For compositions up to NaAlO 2 = 0.42 (which includes the subsystem albite-silica) the system NaAlO 2 -SiO 2 shows essentially zero heats of mixing. A negative ternary excess heat of mixing is found in the plagioclase-rich portion of the albite-anorthite-diopside system. The join Si 4 O 8 -CaAl 2 Si 2 O 8 shows small but significant heats of mixing. In albite-anorthite-quartz. ternary glasses, the ternary excess enthalpy of mixing is positive. Based on available heat capacity data and appropriate consideration of the glass transition, the enthalpy of the crystal-glass transition (vitrification) is a serious underestimate of the enthalpy of the crystal-liquid transition (fusion) especially when the melting point, T f , is many hundreds of degrees higher than the glass transition temperature, T g . On the other hand, the same heat capacity data suggest that the enthalpies of mixing in albite-anorthite-diopside liquids are calculated to be quite similar to those in the glasses . The enthalpies of mixing observed in general support the structural models proposed by and (1979a, b) and others for the structure of aluminosilicate glasses.
Henry Darrell J.
Hon R.
Navrotsky Alexandra
Weill Daniel F.
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Thermochemistry of glasses and liquids in the systems CaMgSi 2 O 6 -CaAl 2 Si 2 O 8 -NaAlSi 3 O 8 , SiO 2 -CaAl 2 Si 2 O 8 -NaAlSi 3 O 8 and SiO 2 -Al 2 O 3 -CaO-Na 2 O does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
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