Mass-Spectrometric Thermal Analysis of the Reaction between Strontium Oxide and Tungsten (高温マススペクトロメトリ-<特集>)

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概要

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• The reaction between SrO(s) and W(s) at high temperatures has been studied by a technique of mass-spectrometric thermal analysis. It is found that the vaporization caused by the reaction proceeds in three stages. In the first stage, the gaseous product Sr(g) appears above 1,285 K, leaving the solid product SrWO4(s). In the second stage, the vaporization of Sr(g) occurs again above 1,580 K from the residual SrO(s) unreacted with W(s) during the course of the first stage. In the third stage, SrWO3(g), SrWO4(g), and small Sr(g) vaporize from SrWO4(s). The areas under the curves of the mass-spectrometric thermal analysis have been calculated by a modified integration method. From these areas the apparent partial pressure of Sr(g) in the first stage and also the molar ratio of the gaseous and solid reaction products Sr(g) and SrWO4(s) have been determined. Furthermore, the apparent pressures of SrWO3(g) and SrWO4(g) in the third stage have been obtained by a sensitivity calibration method.

著者

• HARADA Toshio

  Institute of Advanced Energy, Kyoto University

• YAMAMOTO Yutaka

  Institute of Natural Medicine, University of Toyama

• Asano Mitsuru

  Institute Of Advanced Energy Kyoto University

• MIZUTANI Yasuo

  Institute of Atomic Energy, Kyoto University

• SASAKI Noriaki

  Institute of Atomic Energy, Kyoto University

• Harada Toshio

  Institute Of Advanced Energy Kyoto University

• YAMAMOTO Yutaka

  Institute of Atomic Energy, Kyoto University

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