Polarization investigation of Mn-doped 0.72Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 single crystals for infrared detecting application

This work has been carried out to investigate the poling temperature and poling field dependences of pyroelectric and dielectric properties of ⟨ 111 ⟩ oriented Mn-doped 0.72Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 single crystals. Poling treatments are implemented at 25 °C, 90 °C, and 120 °C with DC poling electric fields of 1, 2, 3, and 4 times the corresponding coercive field, respectively. The correlation between ferroelectric domain transition and pyroelectric properties is investigated. The optimized pyroelectric and dielectric performances with the highest pyroelectric coefficient p and the lowest dielectric loss tan δ, as well as the optimized figures of merit, are achieved by poling samples at 90 °C in this study, instead of those conventionally poled at nearly Curie temperature (120 °C). Moreover, excellent long-term performances of 90 °C poled Mn-PMN-0.28PT crystals are disclosed over a 30-day range.