Barium titanate via decomposition of Ba,Ti-precursors: The nature of the intermediate phases

What is it about?

The thermal decomposition of Ba,Ti-precursor complexes, containing organic ligands and suitable for the single-source preparation of nanocrystalline BaTiO3, leads firstly to the segregation of specific Ba-rich and Ti-rich phases. Quantitative electron energy loss spectroscopy and powder X-ray diffraction data indicated that the (i) Ba-rich phase is a BaO-stabilised variant of the calcite-type high-temperature modification of BaCO3 and (ii) Ti-rich phases are represented by low crystalline barium titanates.

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Why is it important?

The paper shows the true nature of the Ba-Ti-intermediate phase which occurs during decomposition of (Ba,Ti) organic precursors to BaTiO3. The composition of this intermediate has been controversially discussed during the last 40 years.