Preparation of transparent conductive (ZnO)mIn2O3 fine powder by gel-combustion reaction

A fine powder of (ZnO)(m)In2O3 (m = 3, 4) was obtained by the self-combustion reaction, under firing at a furnace temperature of 350 degrees C in a nitrogen atmosphere, of a gel prepared from a mixed zinc and indium nitrate aqueous solution peptized with citric acid. A (ZnO)(3)ln(2)O(3) single-phase product was obtained when citric acid was substituted by glycine, because the combustion temperature of glycine mixture is > 1260 degrees C. The highest electrical conductivity, 0.2Scm(-1), was obtained in a tin-substituted, transparent conducting (ZnO)(m)In2O3 product, where m = 3 and 4.