Other
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.1261d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 50, Issue 6, pp.1261-1265
Other
5
Scientific paper
The viscosity-temperature relationships of five melts on the join Na 2 Si 2 O 2 -Na 4 Al 2 O 5 (5, 10, 20, 30 and 40 mole percent Na 4 Al 2 O 5 ) have been measured in air, at 1 atm and 1000-1350°C with a concentric cylinder viscometer. All the melts on this join of constant bulk polymerization behave as Newtonian fluids, in the range of shear rates investigated, and the melts exhibit Arrhenian viscosity-temperature relationships. Isothermal viscosities on this join initially decrease and then increase with increasing mole percent Na 4 Al 2 O 5 . The minimum viscosity occurs near 20 mole percent Na 4 Al 2 O 5 at 1000°C and moves to higher Na 4 Al 2 O 5 content with increasing temperature. The observation of a viscosity minimum along the join Na 2 Si 2 -O 5 -Na 4 Al 2 O 5 is not predicted based on earlier viscosity data for the system Na 2 O-Al 2 O 3 -SiO 2 (RlEBLlNG, 1966) or based on calculation methods derived from this and other data (Bottinga and Weill, 1972). This unexpected behavior in melt viscosity-temperature relations emphasizes the need for a more complete data set in simple silicate systems. Previous spectroscopic investigation of melts on the join Na 2 2Si 2 O 5 -Na 4 Al 2 O 5 offer a structural explanation for the observed viscosity data in terms of a disproportionation reaction involving polyanionic units. Macroscopically, the viscosity data may be qualitatively reconciled with the configurational entropy model for viscous flow ( , 1984).
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