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  • Author or Editor: N. Hishinuma x
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Abstract  

A method of radioactivation analysis has been developed for the determination of Mn, Cu, Zn and Cd impurities in gallium arsenide. After irradiation, arsenic and gallium are separated by distillation and solvent extraction, then the impurity elements are determined by substoichiometric methods. Mn is extracted as tetraphenylarsonium permanganate into chloroform, and other elements as dithizonates in carbon tetrachloride under various conditions. The contents of Mn, Cu, Zn and Cd in a gallium arsenide crystal with a carrier concentration of 1.8·1016/cc were 0.004, 0.02, 0.006 and 0.04 ppm, respectively.

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Abstract  

A method of radioactivation analysis has been developed for the determination of Ni, Au and Ag impurities in gallium arsenide. The separation and substoichiometric extraction of these elements were studied and analytical procedures are suggested for their determination. All components are separated by suitable procedures and determined by substoichiometric methods. Ni is extracted as diethyldithiocarbamate into toluene, Au as a complex of rhodamine-B in chloroform, and Ag as dithizonate in carbon tetrachloride. The contents of Ni, Au and Ag in a gallium arsenide crystal with a carrier concentration of 1.8·1016/cm3 were 0.05–0.08, 0.006–0.008 and 0.002–0.005 ppm, respectively.

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