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
_1/2
Nb
_1/2
)O
_3-y
Pb(Mg1/3Nb2/3)O3-(1ߝxߝy)PbTiO3 {PIMNT [100x/100y/100(1ߝxߝy)]} 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
_1/3
Nb
_2/3
)O
₃
-0.29PbTiO
₃
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.