Effects of oxide additives on the electrical properties of sodium bismuth titanate-based lead-free ceramics

Publication date: Available online 16 November 2019Source: Materials Research BulletinAuthor(s): Yuxia Kong, Huanyu Zhao, Longting Li, Yu Long, Jigong HaoAbstractIn this work, the effects of oxide additives on the phase structure and electrical properties of sodium bismuth titanate-based [0.94(Bi0.5Na0.5)TiO3–0.06BaTiO3 (BNBT6)] lead-free ceramics were investigated. Results showed that all oxide additives diffused into the BNBT6 lattice to form a single perovskite phase structure. The oxide additives doped into BNBT6 enhanced the electric-field-induced strain without diminishing its piezoelectric activity. With Mn addition, the ceramics obtained a large strain of 0.30% and high d33 value of 166 pC/N. The strain was sensitive to temperature and increased to 0.43% at the depolarization temperature. Remarkably, the studied Mn-modified samples exhibited a fatigue-free behavior that is insensitive to temperature. The large strain response, high piezoelectric activity, and temperature-independent fatigue-free behavior suggested that these materials are promising lead-free candidates for electromechanical actuator applications.Graphical AbstractIn this work, the effects of oxide additives (Co2O3, Cr2O3, Al2O3, Sc2O3, ZrO2, La2O3, ZrO2, and MnO2) on the phase structure and electrical properties of sodium bismuth titanate-based [0.94(Bi0.5Na0.5)TiO3–0.06BaTiO3 (BNBT6)] lead-free ceramics were investigated. Results showed that all oxide additives diffused into the BNBT6 lattice to ...
Source: Materials Research Bulletin - Category: Materials Science Source Type: research