<報文>レーザーフラッシュ法による溶融ケイ酸塩の比熱測定

概要

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Specific heat capacity of molten silicates has been measured by means of a laser flash method. As a preliminary experiment, the specific heat capacities of molten sodium silicates have been measured by comparing the temperature rise of a platinum plate irradiated by a laser pulse to the case with the sample melt. Such measurement showed considerably lower values of specific heat capacities than that of a drop calorimetry. Since the laser flash method is relative method with reference, the similarity in size and shape of specimens, including the reference run, is most important for reliability of measurement. Thus, a disposable dish shaped cell made of platinum foil was used with a fused silica as the reference material. This method provided the reliable data for the sodium silicate melts. Measured specific heat capacities of molten Na_2O-SiO_2,K_2O-SiO_2,and CaO-Al_2O_3-SiO_2 systems are given as regression formulae including the super-cooled state. Errors containing in these regression formulae can be estimated to be ±5% at most. The main factors of the scattering of the data may be attributed to the fluctuation of the intensity of the laser pulse. Thus, a monitering of laser beam intensity is quite helpful to improve an accuracy of this method.
東北大学の論文