Enhanced piezoelectric and optical properties of tetragonal Sm-doped Pb(In_1/2Nb_1/2)-Pb(Mg_1/3Nb_2/3 )-PbTiO₃ crystals

Relaxor ferroelectric single crystal Pb(In1/2Nb1/2)O-3-Pb(Mg1/3Nb2/3)O-3-PbTiO3 (PIN-PMN-PT) has received extensive research and attention due to its excellent piezoelectric, electromechanical, and other properties. In particular, tetragonal relaxor ferroelectric single crystals have shown greater application potential in high-temperature devices due to their higher Curie temperature and better stability. However, the low piezoelectric performance of tetragonal crystals also greatly limits its application, and research on its optical properties is not sufficient. In this paper, the tetragonal phase Sm-PIN-PMN-PT single crystal was obtained by the Bridgman method, and its piezoelectric and electro-optical properties are studied. At the same time, we gave a complete set of piezoelectric, dielectric, and elastic coefficient matrices. The results show that the crystal has excellent piezoelectric and electromechanical properties. The piezoelectric coefficient can reach 905pC/N, the electromechanical coupling coefficient k(33) is 85%, and the k(t )is 72%. The transmittance of the sample polarized along [001] direction can reach 66%. The effective electro-optical coefficient ?c is 60 pm/V at room temperature and can reach 86 pm/V at 70(?)C. It has a wide operating temperature range and stable performance with frequency variation, which has certain reference significance for application in new electro-optical devices.