Ultrafine Metal Oxide Microwave Solid-phase Synthesis

In this paper, these metal oxides were obtained by decomposition of precursors. These precursors were prepared by solid-state reaction under microwave irradiation of metal(Co. Mn. Ni. Zn et al) carbonate or hydration carbonate and oxalic acid. The production was compared with the production which was obtained by decomposition of precursors which was prepared by solid-state reaction.Though those experiments we can see that the method of solid-state reaction under microwave irradiation is a easily synthetic method. This method breaks through the limitation of liquid-state syntheses method before (Fox example , needing solvent, reaction condition is controlled difficultly, product equipments are more complicate and nanometer particles produced reunite easily etc.) . Compared with the traditional solid-state reaction, the biggest characteristic of solid-state reaction under microwave irradiation was the speed was improved. In this paper, it was one or two days that precursor was prepared by solid-state reaction but it was only several minutes that precursor was prepared by solid-state reaction under microwave irradiation.The influence of such factors as power, time of microwave irradiation, the decomposing temperature and time was discussed in detail. The optimal experiment condition was determined by those orthogonal experiments. Though those experiments we can see that decomposing temperature is the biggest effect factor. Only strictly controlling the temperature can it be prepared what we need, especially for decomposition precursors of Cobalt and Manganese oxides.The characteristics of those precursors and metal oxides were analysised by TG-DTG, IR, XRD, TEM and so on. Though those experiments we can see that those precursor and metal oxides which were prepared by two method have the same crystal system. The size of the metal oxidations, which were prepared by solid-state reaction under microwave irradiation, is smaller than those production which were prepared by solid-state reaction, except for nickel oxide.HABSTRACTThe productions are tetragonal y-MnaOa, tetragonal MnsC^, cubic €0364, cubic NiO hexagonal ZnO, the particles' distribution is even and size is about 20~80nm.