Abstract
The preparation of homogeneous Bi7Ti4NbO21 single phase ceramic nanosized powders at temperatures as low as 400°− 500°C using a metal-citrate complexes method, based on the Pechini-type reaction route, is described. The thermal decomposition/oxidation of the polymerized resin, as investigated by TG/DTA, XRD, and SEM, led to the formation of a well defined orthorhombic Bi7Ti4NbO21 compound with lattice parameters a=0.544, b=0.540, and c=2.905 ± 0.0005 nm. Reaction formation take place through an intermediate binary phase with a stoichiometry close to Bi20TiO32 which formes between 300°C and 375°C. The metal-organic precursor synthesis method, allows to control the Bi/Ti/Nb stoichiometric ratio leading to the rapid formation of the nanosized bismuth titanate niobate, Bi7Ti4NbO21, ceramic powders, at temperatures much lower than usually needed in the conventional route.
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