LAUSR

Abstract We report a simple and facile approach for the synthesis of semiconducting BaTiO3 nanoparticles at low temperature using a direct solid state reaction between metal Ti and barium nitrate. The irregular large grain-sized Ba(NO3)2 and Ti powders can be converted into homogenous BaTiO3 nanoparticles. The morphologies and structures of the BaTiO3 nanoparticles can be facilely tuned. The semiconducting BaTiO3 nanoparticles can be obtained at the condition of Ba/Ti ratio between 1:1 and1:3 just calcinated at 550 °C. The residual Ba(NO3)2 can be clear observed when Ba/Ti > 1:1, and titanium nitride appear when Ba/Ti~1:16.The reaction of synthesis of semiconducting BaTiO3 nanoparticles starts at 550 °C. Under the suitable conditions, semiconducting BaTiO3 nanoparticles can be prepared with the grain size~30 nm homogenously. During synthesis reaction, the transfer of N cation into Ti lattice is proposed for the mechanism of direct reaction between Ba(NO3)2 and Ti for synthesis of BaTiO3 nanoparticles, which results in cation N decreases its valence and turns to an anion.