Thermal conductivity of sodium disilicate melt at high pressures

Details Thermal conductivity of sodium disilicate melt at high pressures Thermal conductivity of sodium disilicate melt at high pressures

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...37..206s&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 37, Issue 2-3, p. 206-213.

Physics

5

Scientific paper

The thermal conductivity of sodium disilicate (Na2O . 2SiO2) has been measured over the temperature range 300 to 1600 K at high pressures up to 5 GPa. Data have been obtained for four states of sodium disilicate: crystal, melt and two types of glass (normal and densified in the non-rigid state). The conductivity of the crystalline state obeys an inverse temperature dependence. Whereas the thermal conductivity of glass at atmospheric pressure increases with temperature, the results at high pressures exhibit an initial decrease of conductivity up to ~ 900 K, followed by a premonitory increase before melting. The conductivity decreases by ~ 70% in the melt range and the conductivity of the melt becomes almost independent of temperature. The pressure dependence of the conductivity for the melt has a minimum at ~ 2 GPa. This is close to the pressure where a change of melt structure is inferred from viscosity and density measurements for the same melt at high pressures.

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