| Summary: | Bi<sub>2</sub>O<sub>3</sub> was investigated in the role of a modifier for BaTiO<sub>3</sub> powder synthesized in a water vapor atmosphere at 200 °C and 1.55 MPa. Modification was aimed at increasing the sinterability of the powder as well as improving the structural and dielectric properties of the obtained ceramics. The morphology and phase contents of the synthesized BaTiO<sub>3</sub> powder were controlled by the methods of SEM and XRD. Properties of pure and Bi-doped BaTiO<sub>3</sub> ceramics were comprehensively studied by XRD, SEM, dielectric spectroscopy, and standard approaches for density and mechanical strength determination. Doping with Bi<sub>2</sub>O<sub>3</sub> favored BaTiO<sub>3</sub> ceramic densification and strengthening. The room-temperature dielectric constant and the loss tangent of Bi-doped BaTiO<sub>3</sub> were shown to stabilize within the frequency range of 20 Hz to 2 MHz compared to non-doped material. The drop of dielectric constant between room temperature and Curie point was significantly reduced after Bi<sub>2</sub>O<sub>3</sub> addition to BaTiO<sub>3</sub>. Bi<sub>2</sub>O<sub>3</sub> appeared to be an effective modifier for BaTiO<sub>3</sub> ceramics produced from non-stoichiometric powder synthesized in water vapor.
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