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Hafnium was separated from zirconium by a fractional distillational procedure. The distillate was chemically treated to obtain , which was chlorinated and subsequently reduced with magnesium to form hafnium sponge. Essentially pure metal was produced from the sponge by the thermal decomposition of hafnium tetraiodide. A résumé of the properties of iodide hafnium is reported.
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F.B. Litton (1951) studied this question.
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