Grinding-Assisted Solid-State Metathetic Synthesis of Divalent Transition Metal Tungstates

A convenient solid state metathetic synthesis has been developed for the preparation of metal tungstates MWO4 where M = Mn, Fe, Co, Ni and Zn using Na 2WO 4 and respective MCl2 as reactants. Stoichiometric quant ities of respective reactants were mixed and ground for 2hrs. XRD patterns of the homogenised mixture heat treated at 400∫C for 4hrs and then washed free from NaCl bye product were in good agreement with the respective JCPDS data showing the formation of p hase pure compounds in each case without any contamination. Microstructural investigation indicated particle size of the order of µm .