Abstract
AbstractMonodisperse BaTiO3 microspheres were synthesized using Ba(OH)2, a homemade amorphous TiO2 precursor, and dissolved CO2 as the raw materials. To dissolve sufficient CO2 in the mixing solution, the reaction process was carried out in air. Then, a BaCO3 layer, as a fixed barium source, was coated on the surface of the TiO2 precursor template through a hydrothermal process at 90°C. Furthermore, the BaCO3 reacted with the TiO2 precursor to form pure BaTiO3 through in situ conversion during subsequent heat treatment at 800°C. Compared to the commonly used acid soaking method for the removal of BaCO3 after hydrothermal treatment, the method combining in‐air mixing with a low hydrothermal temperature and heat treatment yielded BaTiO3 microspheres with a more monodisperse homogenous morphology, which have a greater potential in various applications.
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