Piezoelectric and pyroelectric properties of Mn-doped 0.36Pb(In1/2Nb1/2)O3–0.36Pb(Mg1/3Nb2/3)O3–0.28PbTiO3 ceramics

0.5 mol% Mn-doped 0.36Pb(In1/2Nb1/2)O3–0.36Pb(Mg1/3Nb2/3)O3–0.28PbTiO3 (Mn-PIMNT) ceramics were fabricated by a two-step precursor method. The phase structure, morphologies, and temperature-dependent dielectric, ferroelectric, piezoelectric, and pyroelectric properties were studied. The results indicated that the Mn-PIMNT ceramics had pure perovskite phase and uniform grain distribution. Meanwhile, it exhibited ultrahigh piezoelectric coefficient d33 of 235 pC/N, high-power figure of merit (FOM) of 60,160 pC/N, large remnant polarization Pr of 34.57 µC cm−2 and coercive field EC of 12.97 kV cm−1, which were much better than that of binary Mn-PMNT ceramics. Moreover, by Mn ions-doping, giant pyroelectric coefficient p up to 4.8 × 10–4 C m−2 K−1 was obtained and the figure of merits for the detectivity Fd reached 2.317 × 10–5 Pa−1/2, higher than PIMNT ceramics. Combined with the outstanding piezoelectric and pyroelectric properties as well as high ferroelectric rhombohedral to tetragonal phase transition temperature Trt (up to 146 ℃) and ferroelectric tetragonal to cubic phase transition TC of 188 ℃, it is suggested that the Mn-PIMNT ceramics are an excellent candidate for piezoelectric and pyroelectric devices.