(a) VO, TiO and NiO all have defect rock salt structures. Explain what this statement means,
(b) hi NiO, the Ni-0 internuclear separation is 209 pm. Determine the volume of a unit cell of NiO, and its density, assuming a non-defect structure. Given that the observed density of NiO is 6.67 gem-3, determine the extent of vacancies in the NiO lattice. Express your answer as a percentage.
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