2018 Volume 65 Issue 12 Pages 739-745
A short overview is given on the rationalization of preparative processes of complex oxide nanoparticles. After a brief introduction associated with mechanochemical effects as a background, merits of combining mechanical activation and subsequent chemical treatments for the synthesis of complex oxide nanoparticles are emphasized. Mechanical stressing on the stoichiometric mixture of all the ingredients at an appropriate stage significantly reduces the subsequent calcination temperature. It is necessary for attaining high crystallinity and phase purity, while suppressing grain growth. A precursor with preformed embryos or nuclei is appropriate for subsequent low temperature solid-state synthesis. This is realized by careful choice of the starting ingredients and sparing mechanical stressing, usually exerted by a grinding mill. The procedure leads to complex oxide materials with high crystallinity and small particle size, simultaneously. A case study is given on the preparation of garnet type cubic Li7La3Zr2O12 (c-LLZO), A possibility of application to all solid Li ion battery is also refeered.
