Growth and Improved Properties of Ternary Piezoelectric Single Crystals in Lead Indium Niobate-Lead Magnesium Niobate-Lead Titanate System

摘要

Ternary piezoelectric crystals Pb(In_(1/2)Nb_(1/2))O_3-Pb(Mg_(1/3)Nb_(2/3))O_3-PbTiO_3 (PIN-PMN-PT) have improved thermal and electrical stability than binary PMN-PT. To better understand crystal system and optimize crystal properties, we systematically investigated crystal growth for compositions between the two binary end-members, PMN-PT and PIN-PT. The ternary system has a compositional window where crystals can be grown directly from stoichiometric melt. PIN-PMN-PT crystals exhibited excellent piezoelectric properties (e.g., k_(33) ～ 0.87-0.92, d_(33) ～ 1000-2200 pm/V). Higher PIN content further stabilized piezoelectric performance by ～ 40°C increase in T_(R/T) and more than doubling E_C (～7.0 kV/cm). Such improvements are important for applications at elevated temperature and/or high-drive conditions.