Abstract
Processes and interface structures occurring during BaTiO 3 sintering in the presence of the sintering aid SiO 2 are studied by model experiments. The formation of fresnoite Ba 2 TiSi 2 O 8 and different Ti-rich barium titanates by solid state reactions proceeding at the (001)BaTiO 3 /SiO 2 interface is followed by XRD and TEM. High resolution transmission electron microscopy (HRTEM) permits the structure to be studied of the various solid-solid reaction fronts involved. The observations indicate, e.g., a certain topotaxial reaction mechanism at the Ba 4 Ti 13 O 30 /BaTiO 3 (001) and Ba 6 Ti 17 O 40 / BaTiO 3 (001) reaction fronts, which comprises the outdiffusion of barium, the indiffusion of titanium and oxygen, and a restacking of the BaTiO 3 {111 }planes.
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