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(Bi 0.38 Na 0.30 Sr 0.28 ) 0.98 La 0.02 Ti 1-x Zr x O 3  (abbreviated as BNSLT 1-x Zr x , with  x  = 0 − 0.05) lead free ceramics were fabricated using the solid-state combustion method. The phase structure, microstructure and electrical properties of the ceramics were investigated. The coexistence of the rhombohedral (R) and tetragonal (T) phases was found in all samples. Rietveld refinement confirmed that as x increased from 0 to 0.05, the rhombohedral phase increased from 41 to 60%. A nearly equal R:T phase ratio of 49:51 was obtained for  x  = 0.01. All ceramics displayed polygonal grain shapes with anisotropic grain growth. The average grain size of the ceramics was in the range of 0.46–0.79 µm. The optimal Zr 4+  content resulted in increased grain growth and reduced pores, leading to improved electrical properties. The highest density (5.52 g/cm 3 ), maximum dielectric constant (εm=2156), maximum polarization (P max =15.36 µC/cm 2 ) and high energy storage properties (W total =0.49 J/cm 3 , W rec =0.45 J/cm 3 , W loss =0.05 J/cm 3  and η = 90.54% at 60 kV/cm) were obtained from  x  = 0.01 caused by a morphotropic phase boundary (MPB) and good morphology.

Enhancement of the Dielectric and Energy Storage Properties of Lead-Free BNSLT Ceramics by Zr 4+ Substitution into B-Sites