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In this study, the phase formation, microstructure, and electrical properties of Sr 0.3 (Bi 0.70 Na 0.67 Li 0.03 ) 0.5 (Ti 1-x Nb x )O 3 : SBNLT-Nb x  lead-free ceramics synthesized via the solid state combustion technique were examined. SBNLT-Nb x  ceramics with various Nb content of  x  = 0, 0.01, 0.03, and 0.05 were calcined at 750 °C and sintered at 1175 °C for 2 h, respectively. The SBNLT-Nb x  calcined powders showed a perovskite structure and a secondary NbO 2  phase was observed with Nb 5+  content of 0.03 and 0.05 mol%. All SBNLT-Nb x  ceramics exhibited a pure perovskite phase with coexisting rhombohedral and tetragonal phases. The grain size was in the range of 1.17-1.34 µm. The  εmax  and  tan δmax  tended to decrease with increased x content. The best ferroelectric and energy storage properties ( Pmax  = 27.45 µC/cm 2 ,  Pr  = 1.92 µC/cm 2  and  Wtotal  = 0.958 J/cm 3 ,  Wrec  = 0.739 J/cm 3 ,  Wloss  = 0.219 J/cm 3 ,  η  = 77.1%), measured under an electric field of 70 kV/cm, were observed at  x  = 0.01.

integrated ferroelectrics

Influence of Nb 5+  Substitution on the Phase Formation, Microstructure and Electrical Properties of SBNLT Ceramics Synthesized via the Solid-State Combustion Technique