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Hitachi Ltd
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Hitachi Ltd
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Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP6001176ApriorityCriticalpatent/JPS52143903A/en
Publication of JPS52143903ApublicationCriticalpatent/JPS52143903A/en
PURPOSE: To conduct high purity refining with preventing an ampoule break by interrupting the light to the tamp. range above 50°C of furnace core tube in zone refining apparatus for the material which tends to photolysis such as PbI2 and displays high vapor pressure due to formed I2.