The temperature-dependent piezoelectric and electromechanical properties of cobalt-modified sodium bismuth titanate |
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| Affiliation: | 1. School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People’s Republic of China;2. Research School of Chemistry, The Australian National University, Australian Capital Territory, Canberra 0200, Australia;3. Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA;1. School of Materials Science and Engineering, Jiangxi Key Laboratory of Advanced Ceramic Materials, Jingdezhen Ceramic Institute, Jingdezhen 333403, China;2. Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA;3. Key Laboratory of Optoelectronic Material and Device, Shanghai Normal University, Shanghai 200234, China;1. School of Materials Science and Engineering, Jiangxi Key Laboratory of Advanced Ceramic Materials, Jingdezhen Ceramic Institute, Jingdezhen 333403, China;2. Materials Research Institute, Pennsylvania State University, University Park, PA 16802, USA;3. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China |
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| Abstract: | Lightly cobalt-modified, Aurivillius-type, sodium bismuth titanate (Na0.5Bi4.5Ti4O15, NBT) ceramics were synthesized by substituting a small amount of cobalt ions onto the Ti4+ sites using conventional solid-state reaction. X-ray photoelectron spectroscopy (XPS) analysis coupled with bond valence sum calculations show that the dopant cobalt ions substitute for Ti4+ ions in the form of Co3+. The resultant cobalt-modified NBT ceramics (NBT-Co) exhibit better piezoelectric and electromechanical properties by comparison with pure NBT. With only 0.3 wt% Co3+ substitution, the piezoelectric properties of the NBT-Co ceramics are optimal, exhibiting a high piezoelectric coefficient (d33~33 pC/N), a low dielectric loss tan δ (~0.1% at 1 kHz), a high thickness planar coupling coefficient (kt~34%) as well as a high Curie temperature (Tc~663 °C). Such NBT-Co ceramics exhibit nearly temperature-independent piezoelectric and electromechanical properties up to 400 °C, suggesting that these cobalt-modified NBT ceramics are promising materials for high temperature piezoelectric applications. |
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| Keywords: | Bismuth layer-structured ferroelectrics Aurivillius type Sodium bismuth titanate Piezoelectric ceramics |
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