KTN铁电单晶压电性能的研究进展OA

Potassium tantalate niobate(KTN)-based ferroelectric single crystals with a perovskite structure have been extensively studied over the past few decades due to their advantages such as high piezoelectric constants,high phase transition temperatures,and nontoxic chemical compositions.With a deeper understanding of crystal growth processes and post-growth treatments,researchers have improved crystal quality and continuously increased crystal sizes using the top-seeded solution growth method.Recent studies have reported a piezoelectric constant exceeding 505 pC/N and an electromechanical coupling factor of 0.75 for tetragonal KTN single crystals.A high unipolar strain of 0.32％was achieved under an electric field of 15 kV/cm.This paper systematically reviews the research progress of piezoelectric properties of KTN-based ferroelectric single crystals,encompassing their growth techniques and approaches for enhancing electromechanical properties,such as ion doping and domain structures.Key technical approaches such as domain engineering and those for reducing growth defects and enhancing electromechanical performance are discussed.In addition,the current research challenges are identified,and future development prospects are outlined.