High performance Aurivillius-type bismuth titanate niobate (Bi3TiNbO9) piezoelectric ceramics for high temperature applications |
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| Affiliation: | 1. School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China;2. Materials Research Institute, The Pennsylvania State University, University Park, PA 16802, USA;1. College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China;2. School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China;1. College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China;2. School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China;1. College of Materials Science and Engineering, Sichuan University, Chengdu 610064, China;2. China Academy of Engineering Physics, Mianyang 621907, China |
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| Abstract: | This paper reports the significant improved piezoelectric properties of high temperature bismuth titanate niobate (Bi3TiNbO9, BTN) polycrystalline ceramics. The piezoelectric performance of BTN ceramics is significantly enhanced by cerium modifications. The dielectric measurements indicate that the Curie temperature Tc gradually decreases over the temperature range of 907–889 °C with cerium contents increasing up to 0.7 wt%. The BTN-5Ce (BTN+0.5 wt% CeO2) exhibits optimized piezoelectric properties with a piezoelectric constant d33 of 16 pC/N, which is five times the value of unmodified BTN (d33~3 pC/N), while BTN-5Ce maintains a high Curie temperature Tc of 894 °C. The temperature-dependent electrical impedance and electromechanical coupling factors (kp, and kt) reveal that the BTN-5Ce exhibits thermally stable electromechanical coupling characteristics up to 500 °C but significantly deteriorates at 600 °C due to high conductivity at a higher temperature. The thermally stable electromechanical properties in combination with the ceramics? high electrical resistivity (106 Ω cm at 500 °C) and high Curie temperature (~900 °C) demonstrate that cerium-modified BTN ceramics are good materials for high temperature sensing applications. |
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| Keywords: | Piezoelectricity Ceramics Bismuth layer-structured ferroelectrics Bismuth titanate niobate |
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