Abnormal piezoelectric properties of acceptor doped 0.75BF-0.25BT lead-free ceramics for application in atomizer |
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Affiliation: | 1. School of Advanced Materials and Nanotechnology, Xidian University, Xi''an, 710071, China;2. Key Laboratory of Wide Band-Gap Semiconductor Materials & Devices, Xidian University, Xi''an, 710071, China |
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Abstract: | Ecologically sustainable hard type piezoelectric ceramics are highly demanded for high power transducer applications in replacing lead-based piezoelectric ceramics. In this study, MnO was proposed as acceptor dopant to modify the electric properties of 0.75BiFeO3-0.25BaTiO3 piezoelectric ceramics. Results showed that MnO doping reduced the lattice distortion of rhombohedral phase and facilitated the formation of pseudo cubic phase of 0.75BiFeO3-0.25BaTiO3 system. Moreover, it caused the diversity of domain morphology and reduced the domain size as well. XPS analysis indicated that Mn2+ ions suppressed the transition from Fe3+ ions to Fe2+ ions and gave rise to the increase of oxygen vacancies. Accordingly, the introduction of MnO synergistically increases the d33, Kp, and Qm and lowers the tanδ of 0.75BiFeO3-0.25BaTiO3 ceramics. The abnormal enhancement in hard type properties is ascribed mainly to the increase of extrinsic contribution rather than the pinning effect arising from oxygen vacancies. Finally, based on an optimal 0.75Bi(Fe0.985Mn0.015)O3-0.25BaTiO3 system, an atomizer prototype was fabricated. The remarkable atomization effect suggests a competitive potential of 0.75BF-0.25BT ceramic for transducer application. |
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Keywords: | Doping Ferroelectric domain Piezoelectric property Atomizer |
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