Piezoelectric and pyroelectric properties of Mn-doped 0.36Pb(In1/2Nb1/2)O3-0.36Pb(Mg1/3Nb2/3)O3-0.28PbTiO3ceramics

0.5 mol% Mn-doped 0.36Pb(In1/2Nb1/2)O-3-0.36Pb(Mg1/3Nb2/3)O-3-0.28PbTiO(3)(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 coefficientd(33)of 235 pC/N, high-power figure of merit (FOM) of 60,160 pC/N, large remnant polarizationP(r)of 34.57 mu C cm(-2)and coercive fieldE(C)of 12.97 kV cm(-1), which were much better than that of binary Mn-PMNT ceramics. Moreover, by Mn ions-doping, giant pyroelectric coefficientpup to 4.8 x 10(-4)C m(-2) K(-1)was obtained and the figure of merits for the detectivityF(d)reached 2.317 x 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 temperatureT(rt)(up to 146 celcius) and ferroelectric tetragonal to cubic phase transitionT(C)of 188 celcius, it is suggested that the Mn-PIMNT ceramics are an excellent candidate for piezoelectric and pyroelectric devices.