In this study, lead-free 94Na0.5Bi0.5TiO3-6BaTiO3 (94NBT-6BT) piezoelectric ceramics and embedded single crystals inpolycrystalline 94NBT-6BT matrix were sintered by conventional (CS) and spark plasma sintering (SPS) techniques. Theeffects of SPS and CS on the microstructure of the 94NBT-6BT ceramics were discussed and compared. Theoretical densityof the CS and SPS treated samples were found to be 94% and almost 99.9%, respectively. High porosity and weak seed-matrixinteraction at 1180 oC for 2 h were obtained from CS sintered ceramics. On the other hand, sintered samples with SPS showednon-porous polycrystalline matrix, and quite strong seed-matrix interface bonding at 950 oC for 5 min. Also, dielectricproperties of sintered ceramics with SPS gave better results than CS. Therefore, SPS assisted 94NBT-6BT samples can be usedto grow high quality and high performance single crystals using solid state single crystal growth. KCI Citation Count: 0