首页|Separation of Hafnium from Zirconium by Selective Reduction of Zirconium Tetrachloride with Aluminium
Separation of Hafnium from Zirconium by Selective Reduction of Zirconium Tetrachloride with Aluminium
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NSTL
During the last thirty years the separation of hafnium from zirconium has been attempted by various methods, ranging from fractional crystallisation and fractional distillation to paper chromatography and even thermal diffusion. The emphasis on the chemical identity of the two elements, however, has always been so dominant that, until very recently, there was a tendency to exclude schemes of separation based on possible differences in chemical behaviour. Although zirconium and hafnium do show a very close correspondence in their chemical properties, a comparative study of their electronic structure and ionisation potentials, and an analysis of the available thermochemical data suggest that there should exist certain differences in stability between analogous compounds of these two elements, which may be purposefully exploited for their separation.
NSTL
