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Two-Step Sintering and property of (1-x)BiScO3-xPbTiO3 Piezoelectric Nanoceramics
Keywords: piezoelectric , nanoceramics, high Curie temperature
Two-Step Sintering and property of (1-x)BiScO3-xPbTiO3 Piezoelectric Nanoceramics Longtu Li *, Xiaohui Wang, Shaopeng Zhang [*] Prof. Longtu Li State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University Beijing, 100084 (China) E-mail: Abstract: Motivated by the market demand for small-grain-size ferroelectric ceramics and the promise of enhanced properties in fine-grained ceramics, investigation of the grain size effect on microstructures and properties of ferroelectric/piezoelectric ceramics becomes significantly important. Understanding the ferroelectricity in perovskite bulk dense nanograin ceramics is a fundamental issue that has remained unsolved for decades. Piezoelectric material as one kind of ferroelectrics can convert electrical energy into mechanical energy and vice versa. This electromechanical property arises due to the coupling of spontaneous polarization with lattice strain. Many devices such as ultrasonic transducers and piezoelectric actuators make use of this property. Since the synthesis of (1-x)BiScO3-xPbTiO3 (BS-PT) by Eitel and coworkers in 2001, this new perovskite solid solution has attracted considerable attention as a promising candidate for high temperature actuator and transducer applications due to its high Curie temperature and robust thermal stability as well as excellent piezoelectric properties. In this paper, we describe the methods for fabricating highly dense (1-x)BiScO3-xPbTiO3 piezoelectric nanoceramics, and then following by the systemically investigation of size effect on the microstructures and piezoelectric behaviors of BSPT nanoceramics. BS-PT ceramics with the average grain size from mirometer scale down to 10 nm were prepared by Two-Step Sintering method. The microstructures and properties of the bulk dense nanocrystalline ceramics were characterized by mean of XRD, HRTEM, AFM, SPM, hysteresis loop and dielectric measurements.
Longtu Li , Professor
Department of Materials Science and Engineering, Tsinghua University
Beijing, Beijing

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