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In this work, we report a systematic study of complex La 3+ and Sc 3+ doped lead zirconate titanate ceramics with the stoichiometric formula (PbZr 0.53 Ti 0.47) 0.90 (La x Sc 1− x) 0.10 O 3− δ for x= 0.2, 0.4, 0.6, and 0.8 denoted as PLZTS2, PLZTS4, PLZTS6, and PLZTS8, respectively (abbreviated as PLZTS10x), synthesized using the solid-state reaction method. We carried out dielectric measurements on Ag/PLZTS10x/Ag metal–ferroelectric–metal capacitors as a function of temperature (100–650 K) and frequency (10 2–10 6 Hz). Upon increasing La 3+ concentration, the dielectric constant was found to be increased up to x= 0.6 and attained the highest value of∼ 1800 at room temperature, and consequently, the highest saturation polarization was observed. The relaxor behavior of PLZTS8 can be attributed to the polar nano regions created in the materials. A recoverable energy density of∼ 1162 mJ/cm 3 with an …