Effects of LaNiO3 seeding layers on the crystal structure and electrical properties in 0.94(Bi0.5Na0.5)TiO3–0.06BaTiO3 thin films

Abstract

In this work, the high-quality 0.94(Bi0.5Na0.5)TiO3–0.06BaTiO3 (hereafter abbreviated as BNT–BT) lead-free piezoelectric thin films were synthesized by introducing LaNiO3 (hereafter abbreviated as LNO) seeding layers. The effects of LNO seeding layers on the crystal structure and electrical properties were systematically investigated. The X-ray diffraction patterns indicate that highly (100)-oriented BNT–BT films were prepared through utilizing LNO seeding layers. The maximum piezoelectric coefficient d33⁎ of ~100pm/V, remanent polarization 2Pr of ~18μC/cm2 and dielectric constant ɛr ~410 have been obtained in the highly (100)-oriented BNT–BT films. The observed tremendous enhancement of piezoresponse, ferroelectric and dielectric properties in LNO-seeded films can be attributed to the better crystallization quality, higher degree of (100)-preferred orientation and reduced leakage current density. These findings demonstrate that LNO-seeded BNT–BT thin films integrating with silicon substrates may provide a wide range of applications in high-performance MEMS devices.