Effects of oxide additives on the electrical properties of sodium bismuth titanate-based lead-free ceramics. (February 2020)

• Record Type: Journal Article
• Authors: Kong, Yuxia; Zhao, Huanyu; Li, Longting; Long, Yu; Hao, Jigong
• Is Part Of: Materials research bulletin. Volume 122(2020)
• Publication Date: 2020-02
• Subjects: Ceramics -- Ferroelectrics -- Electrical properties -- Field-induced strain -- Fatigue; Materials -- Periodicals; Crystal growth -- Periodicals; Matériaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Crystal growth; Materials; Periodicals; 620.11
• DOI: 10.1016/j.materresbull.2019.110699
• Languages: English
• ISSNs: 0025-5408

Abstract

Graphical abstract: In this work, the effects of oxide additives (Co2 O3, Cr2 O3, Al2 O3, Sc2 O3, ZrO2, La2 O3, ZrO2, and MnO2 ) on the phase structure and electrical properties of sodium bismuth titanate-based [0.94(Bi0.5 Na0.5 )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 d 33 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. Highlights: The oxide additives induce an enhancement of the field-induced strain. All modified samples maintain high piezoelectric activity. The strain is sensitive to temperature, which is pushed to a higher level at T d . The modified samples exhibited a temperature-independent fatigue behavior. Abstract: In this work, the effects of oxide additives on the phase structure and electrical properties of sodium bismuth titanate-based [0.94(Bi0.5 Na0.5 )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 d 33 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.