The interaction of nickel hydroxocarbonate, ammonium paramolybdate, and ammonium metatungstate (Ni:Mo:W= 3: 1:1) is reported.Under mechanical activation conditions, nickel hydroxocarbonate particles undergo comminution and ammonium paramolybdate and ammonium metatungstate particles soften and aggregate.It is demonstrated by DTA,X-ray diffraction and IR spectroscopy that heat treatment of the mechanically activated mixture at400–450°C yields the salts NiMoO4 and NiWO4.Nickel Hydroxocarbonate, Ammonium Paramolybdate and Ammonium Metatungstate
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