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Lead-free Na0.4K0.1Bi0.5TiO3 ceramic: Poling effect and enhancement in electromechanical and piezoelectric voltage coefficient
Affiliation:1. Institute of Technology, Pedagogical University, Podchorazych 2, 30-084 Krakow, Poland;2. A. Chelkowski Institute of Physics, University of Silesia, Uniwersytecka 4, 40-007 Katowice, Poland;3. Department of Soft Matter Research, The Henryk Niewodniczanski Institute of Nuclear Physics PAN, Radzikowskiego 152, 32-342 Krakow, Poland;1. School of Optical and Electronic Information, Engineering Research Center for Functional Ceramics MOE, And Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China;2. Department of Physics, Rajiv Gandhi University of Knowledge Technologies, Ongole, Andhra Pradesh, 523225, India;3. Department of Physics, Rajiv Gandhi University of Knowledge Technologies, Srikakulam, Andhra Pradesh, 532402, India;4. Department of Physics, Sri Sathya Sai Institute of Higher Learning, Vidya Giri, Prasanthi Nilayam, Andhra Pradesh, 515134, India;5. Department of Physics, Ramachandra College of Engineering, Eluru, Andhra Pradesh, 534007, India;1. Hue Industrial College, Viet Nam;2. University of Sciences, Hue University, Viet Nam;1. Department of Physics, Manonmaniam Sundaranar University, Tirunelveli 627012, India;2. Advanced Functional Materials Laboratory, Department of Physics, National Institute of Technology, Tiruchirappalli 620015, India
Abstract:The effect of electric poling on the piezoelectric properties of the sintered Na0.4K0.1Bi0.5TiO3 is studied with varying poling field and temperature. An optimized poling condition (EP =50 kVcm, TP =110 °C) exhibited a high piezoelectric voltage (g33~ 85 mV m/N) and charge coefficients (d33~193pC/N). A combination of electric field induced irreversible transformation from polar nano regions embedded in a non-polar relaxor state to a long-range ordered ferroelectric state and increase in the structural ordering are responsible for the observed high piezoelectric properties. A mechanism is discussed to reveal the origin of high voltage coefficient due to poling, where the decrease of dielectric permittivity can facilitate high g33. This investigation provides an approach for designing the high performance Na0.4K0.1Bi0.5TiO3based materials suitable for sensors and energy harvesting applications.
Keywords:Lead-free  Piezoelectric charge coefficient  Electromechanical coupling  NKBT Ceramic  Morphotropic phase boundary
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