title: Domain Configuration and Thermal Stability of (K0.48Na0.52)(Nb0.96Sb0.04)O3-Bi0.50(Na0.82K0.18)0.50ZrO3 Piezoceramics with High d33 Coefficient.
abstract: The domain configuration of lead-free (K0.48Na0.52)(Nb0.96Sb0.04)O3-Bi0.50(Na0.82K0.18)0.50ZrO3 ceramics with rhombohedral-tetragonal morphotropic phase boundary, accounting for the high piezoelectric property and good thermal stability, were systematically studied. Short domain segments (before poling) and long domain stripes with wedge-shaped or furcated ends (after poling) were found to be typical domain configurations. The reduced elastic energy, lattice distortion, and internal stress, due to the coexistence of rhombohedral and tetragonal phases, result in much easier domain reorientation and domain wall motion, responsible for the high piezoelectric properties, being on the order of 460 pC/N, in which the extrinsic contribution from irreversible domain switching was estimated to be around 50% of the total piezoelectricity. Minor piezoelectric property variations (<6% over a temperature range from -50 to 100 °C) were observed as a function of temperature, showing a good thermal stability. In addition, nanodomains (50 ± 2 nm) were found to be assembled into domain stripes after poling, believed to benefit the high piezoelectric properties but not causing much thermal instability due to the small quantity.
authors.affiliation: College of Physics and Key Laboratory of Photonics Materials and Technology in Universities of Shandong, Qingdao University , Qingdao 266071, Shandong, People's Republic of China.|School of Physics and State Key Laboratory of Crystal Materials, Shandong University , Jinan 250100, People's Republic of China.|Materials Research Institute, Pennsylvania State University , University Park, Pennsylvania 16802, United States.
authors.forename: Yalin
authors.initials: Y
authors.lastname: Qin
authors.affiliation: School of Physics and State Key Laboratory of Crystal Materials, Shandong University , Jinan 250100, People's Republic of China.
authors.forename: Jialiang
authors.initials: J
authors.lastname: Zhang
authors.affiliation: School of Physics and State Key Laboratory of Crystal Materials, Shandong University , Jinan 250100, People's Republic of China.
authors.forename: Weizeng
authors.initials: W
authors.lastname: Yao
authors.affiliation: College of Physics and Key Laboratory of Photonics Materials and Technology in Universities of Shandong, Qingdao University , Qingdao 266071, Shandong, People's Republic of China.
authors.forename: Chaojing
authors.initials: C
authors.lastname: Lu
authors.affiliation: Materials Research Institute, Pennsylvania State University , University Park, Pennsylvania 16802, United States.|Institute for Superconductor and Electronic Materials and Australia Institute of Innovative Materials, University of Wollongong , Wollongong, New South Wales 2500, Australia.
authors.forename: Shujun
authors.initials: S
authors.lastname: Zhang
keywords: KNN-based; R−T phase boundary; domain configuration; lead-free piezoelectrics; strain; thermal stability