Microwave assisted synthesis and characterization of mixed metal hydrazinecarboxylates, metal cobaltites and metal ferrites

Abstract

Metal cobaltites and ferrites have been prepared by the combustion of an aqueous mixture of metal nitrates and hydrazinium hydrazinecarboxylate in a microwave oven. The concentrated solution formed just before decomposition to the respective cobaltites or ferrites is removed and allowed to crystallize at room temperature. Composition of the complexes obtained from the above concentrated solutions has been found to be M_1/3Co_2/3(N₂H₃COO)₂ or M_1/3Fe_2/3(N₂H₃COO)₂ where M= Mg, Mn, Fe, Co, Ni or Zn. The solid products obtained by the decomposition of the combustion mixture and the complexes isolated from the concentrated solutions have been characterized by chemical analyses, infrared spectra and X-ray powder diffraction studies. Thermal degradation of the complexes has also been recorded and the final residues have been found to be the respective metal cobaltites or metal ferrites.