Characterization of crystal structure,electrical and electromechanical properties of Mg-doped 0.94Na1/2Bi1/2TiO3-0.06BaTiO3 |
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| Affiliation: | 1. Department of Materials Science, Sichuan University, Chengdu 610064, PR China;2. Division of Physical Science and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Kingdom of Saudi Arabia;3. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Xi''an Jiaotong University, Xi''an 710049, PR China;4. School of Materials and Energy, Electron Microscopy Centre of Lanzhou University and Key Laboratory of Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, PR China |
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| Abstract: | The use of lead-free piezoelectric materials in high-power applications requires a high mechanical quality factor Qm and temperature-stable ferroelectric properties. In this article, the influence of Mg-doping on the 0.94Na1/2Bi1/2TiO3-0.06BaTiO3 system is analysed with focus on the role of defects related to ferroelectric hardening. Temperature stability (depolarization temperature), electromechanical properties (piezoelectric activity, Qm), electrical properties (conductivity) and crystal structure for compositions were quantified. Compositions with similar amount of Zn-doping were analyzed for reference. A drastic increase in electrical conductivity at ?0.3/?0.5 mol% Mg was associated with a concomitant increase in Qm. Similar behavior in Zn-doped compositions provides a basis for a more comprehensive mechanistic understanding of acceptor doping in these lead-free piezoceramics. The very high and almost vibration-velocity-independent Qm above 800 makes Mg-doped 0.94Na1/2Bi1/2TiO3-0.06BaTiO3 an excellent candidate for high-power application. |
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| Keywords: | Lead-free Piezoceramic Acceptor-doping Mg-doping Zn-doping |
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