Enhanced reactivity of peroxo-modified surface of titanium dioxide nanoparticles used to synthesize ultrafine bismuth titanate powders at lower temperatures

Ceramics International Volume: 42 Issue: 14 Pages: 15767-15772 Published: 2016

Particle formation schematics, comparing (a) the traditional solid-state reaction with (b) reactions involving peroxo-modified surfaces. The local exothermic decomposition releases enough energy to accelerate the reaction at lower temperatures.

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Writers: P. Francatto and F.N. Souza Neto and A.E. Nogueira and A.M. Kubo and L.S. Ribeiro and L.P. Gonçalves and L.F. Gorup and E.R. Leite and E.R. Camargo

Keywords: Nanopowders; Wet-chemical synthesis; Reactive powder; Hydrogen peroxide

Abstract: Bismuth titanate with sillenite structure (Bi12TiO20) was prepared at lower temperatures and shorter times using a modified oxidant peroxide method (OPM). Bi12TiO20 was synthesized utilizing commercial Bi2O3 and reactive titanium dioxide nanoparticles having peroxo-modified surfaces. Rather than depending on particle size, the reaction mechanism is related to the highly exothermic decomposition of peroxo groups, regardless the titanium source used, which locally releases a large amount of energy that can accelerate the reaction, similar to self-propagating high temperature routes (SHS).

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