Dielectric properties and the cubic ⇆ tetragonal phase transition temperature of dense BaTiO 3 ceramics containing 10 mol% BaGeO 3, sintered between 840 and 1350 °C, have been investigated. The ceramic bodies were prepared from a nano-sized BaTi 0.9/Ge 0.1O 3 powder consisting of both BaTiO 3 and BaGeO 3 phases. The addition of BaGeO 3 leads to a reduction and broadening of the permittivity maximum, and to a small downshift of the paraelectric ⇆ ferroelectric phase transition temperature, compared to a pure BaTiO 3 ceramic. Lower sintering temperatures and thus small grain sizes of the ceramics cause an additional reduction of the maximum permittivity down to 2800. Both DTA and dilatometric measurements reveal also a downshifting of the phase transition temperature, as well as a decrease of the latent heat.