Electromechanical Properties and Morphotropic Phase Boundary of Na0.5Bi0.5TiO3-K0.5Bi0.5TiO3-BaTiO3 Lead-free Piezoelectric Ceramics |
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| Authors: | Wen Chen Yueming Li Qing Xu and Jing Zhou |
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| Affiliation: | (1) Institute of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, P.R. China;(2) Jingdezhen Ceramic Institute, Jingdezhen, 333001, P.R. China |
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| Abstract: | The crystal structure and electromechanical properties of two ternary ceramic Na0.5Bi0.5TiO3- K0.5Bi0.5TiO3-BaTiO3 (NBT-KBT-BT) systems were investigated. A gradual change in crystalline structure and microstructure with the increase of
KBT and BT concentrations were observed. It was ascertained that the rhombohedral-tetragonal morphtropic phase boundary (MPB)
lies in the range of 0.024 ≰ x ≰ 0.030 for (1–5x) NBT-4x KBT-x BT system and 0.025 ≰ y ≰ 0.035 for (1 − 3y) NBT—2y KBT—y BT system at room temperature. The piezoelectric constant d33 and electromechanical coupling factor kp of the ceramics attain a maximum value of 150 pC/N and 0.298, respectively. The MPB phase diagram of NBT-KBT-BT ternary system
was determined by phase analysis of XRD patterns from calcined specimens. The ferroelectric properties of the (1 − 5x) NBT—4x KBT—x BT system have been characterized. The ternary system ceramics have relatively high Curie temperature Tc. |
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| Keywords: | Na0 5Bi0 5TiO3 piezoelectric properties morphtropic phase boundary perovskite |
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