Abstract
Reactants of NiO-MoO3 binary solid state reaction are preliminary ground either separately or together in air (dry) or in cyclohexane (wet) by a laboratory vibro-mill. Subsequently, the rate of nickel molybdate formation on heating at 600°C in air was determined by applying Dander rate equation. Dry grinding of NiO followed by an intimate mixing with MoO3 and by wet co-grinding brought the highest rate, due to the large amounts of lattice imperfections introduced into NiO. Preliminary grinding of MoO3, on the other hand, was effectiveless, because of high degree of agglomeration which hinders the intimate mixing on subsequent wet vibromilling. Dry co-grinding was also effective, although less amounts of lattice im-perfections are introduced, compared with dry separate grinding, presumably because of originating precursory products at the contact points of foreign reactant particles during grinding.
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