Pyroelectric performances of rhombohedral 0.42Pb(In1/2Nb1/2)O3-0.3Pb(Mg1/3Nb2/3)O3-0.28PbTiO3 single crystals
Relaxor-based ferroelectric single crystals xPb(In<sub>1/2</sub>Nb<sub>1/2</sub>)O<sub>3-y</sub>Pb(Mg1/3Nb2/3)O3-(100x100y)PbTiO<sub>3</sub> {PIMNT [100x/100y/100(100x100y)]} have been grown by a modified Bridgman technique. The as-grown PIMNT (42/30/28) crystal with rhombohedral perovskite-type structure shows higher Curie temperature TC ~ 187°C, and higher ferroelectric rhombohedral-to-tetragonal phase transition temperature TRT ~ 152°C, both about 50°C higher than those found for 0.71Pb(Mg<sub>1/3</sub>Nb<sub>2/3</sub>)O<sub>3</sub>-0.29PbTiO<sub>3</sub> crystals. Moreover, as a core parameter of pyroelectric material, the detectivity figures-of-merit of PIMNT (42/30/28) crystal are higher than other typical relaxor-based ferroelectric crystals, which primarily stems from the lower dielectric loss, making it promising candidate for infrared detector applications.