A series of hydroxyapatite/barium titanate (HA/BT) and tricalcium phosphate/barium titanate (TCP/BT) composites were prepared in various mixing ratios and sintered at temperatures between 500 and 1300 degrees C using the powder metallurgy method. Sintering was performed under different atmospheres to evaluate the effect of the atmosphere on the phase stability of the composites. BT phase showed slightly higher phase stability in TCP/BT composites than in HA/BT composites. BT with low concentration behaved as a stabilizer of alpha-TCP. A reaction between HA and BT occurred at about 900 degrees C yielding byproducts of CaTiO3 and Ba2TiO4, at the expense of both HA and BT phases. CaTiO3 and Ba2TiO4 phases associated with low BT concentrations were observed in the composites sintered at temperatures between 1100 and 1300 degrees C. The HA/BT composites having BT concentrations less than 95 wt.% did not show any measurable piezoelectric response. Composites with BT promoted osteoblast adhesion even better than pure HA and TCP.