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Lead-free ceramics of 0.6Bi 0.5 Na 0.5 TiO 3 -0.4Sr 0.7 Bi 0.2 TiO 3  (BNT-SBT) were prepared by the solid-state combustion technique using glycine as fuel. The samples were calcined and sintered from 700 to 900 °C for 2 h and from 1100 to 1175 °C for 2 h, respectively. Their phase structure, microstructure and electrical properties were investigated. The XRD and Rietveld refinement results of the ceramic samples showed coexisting rhombohedral and tetragonal phases, with a ratio of 56:44 at a sintering temperature of 1150 °C. The average grain size and the measured density increased with increased sintering temperatures. The highest dielectric, ferroelectric and energy storage properties ( εmax =3142 and tan  δmax =0.041,  Pmax =27.09 μC/cm 2 ,  Wtotal =1.099 J/cm 3 ,  η  = 81.3% and  Pes =1.16%) were obtained from the sample sintered at 1150 °C.

Phase formation, microstructure and electrical properties of BNT-SBT ceramics prepared via the solid-state combustion technique