Heat capacities of Fe2O3-bearing silicate liquids

Article Abstract:

Step scanning calorimetry is advantageous in measuring the heat capacities of iron-containing silicate melts because it is sensitive even at small temperature intervals, the sample can equilibrate with an environment that can be manipulated and it measures heat capacity directly. The heat capacities of twelve silicate melts with different compositions were determined using this method with standard deviations ranging from 0.6 to 3.6 percent. A model equation predicting heat capacity of melts is constructed and analyzed.

Magma, Heat

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The partial molar volume, thermal expansivity, and compressibility of H20 in NaAISisub30sub8 liquid: New measurements and an internally consistent model

Article Abstract:

The density of silicate liquids is important to the dynamic behaviour and chemical differentiation of magmas. The direct density measurements available for hydrous silicate liquids of Burnham and Davis are currently the only measurements available. A study aimed to give volume measurements of hydrous albitic liquids that could obtain partial molar volume, thermal expansivity, and compressibility of the H20 total component in silicate liquids. Measurements were consistent with Burnham and Davis.

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A revised model for the density and thermal expansivity of K2O-Na2O-CaO-MgO-Al2O3-SiO2 liquids from 700 to 1900 K: extension to crustal magmatic temperatures

Article Abstract:

Low-temperature density measurements were performed on a wide array of multicomponent silicate supercooled liquids in which high density data are already available. The data derived were then integrated with previously performed measurements. The results suggested that both SiO2 and Al2O3 have no role in the thermal expansivity of the liquids and that the derivative of the volume function with respect to time for the liquid is not affected in the 701-1896 K temperature range.

Supercooled liquids, Silicates, Expansion (Heat), Thermal expansion

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