四ヨウ化ケイ素の熱容量および融解熱

抄録

The heat capacity of SiI₄ used as a source material in the iodide process of silicon was measured by means of an adiabatic calorimeter available for continuous measurement. The heat capacities of solid and liquid SiI₄ obtained were C_p=19.64+0.0208T cal/mol·deg and C_p=34.62+0.0112T cal/mol·deg, respectively.
The melting point of SiI₄ was 120.5°C. The heat of fusion and the entropy of fusion were 4.70 kcal/mol and 11.9 cal/mol·deg, respectively.
Heat contents, the free energy function of SiI₄ and the standard entropy of S₂₉₈=43.7 cal/mol·deg were derived from the experimental values and thermochemical data. Moreover, the heat capacities of pure Cr, fused quartz and high purity Si were also measured, the values of which were in good agreement with the previous literature.