Ceramics of solid solutions (1-x)BaTiO3-x(Bi(1/2)A(1/2))TiO3 (A=Ag, Li, Na, K, Rb, Cs, x0.20) were prepared and their crystal structures, dielectric, ferroelectric, and piezoelectric properties were investigated. It was found that (Bi(1/2)A(1/2))TiO3-type doping compounds broadened the temperature range of the tetragonal phase in BaTiO3 and all the compositions examined displayed a tetragonal structure at room temperature. The Curie temperature (T-C) was observed to increase with respect to pure BaTiO3 to the range 140 degrees C-210 degrees C through solid solution. Remanent polarization (P-r) tended to decrease with increased content of doping compound, whereas the coercive field (E-C) rose and piezoelectric coefficient (d(33)) fell. The highest d(33) value in the solid solutions was observed in 0.97BaTiO(3)-0.03(Bi1/2Ag1/2)TiO3 at 90pC/N.