A neutron diffraction study of NiCl2in D2O and H2O. A direct determination of gNiH(r)

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Abstract
The technique of neutron diffraction and isotopic substitution has been applied to solutions of 2 mol. kg-1 nickel chloride in light and heavy water. The results were used to obtain gNiH(r) directly. Good agreement is found between the experimental gNiH(r) with that derived from a computer simulation study in which Mg2+ (usually regarded as isomorphically equivalent to Ni2+) was the cation. A neutron diffraction study, again using the isotopic difference method, was also made of 2 mol. kg NiCl2 in a 'null' mixture of H2O and D2O. Results show that the Ni2+ cation is preferentially deuterated, a result in disagreement with recent theoretical calculations by Newton and Friedman (1985).