High thermal stability of energy storage density and large strain improvement of lead-free Bi0.5(Na0.40K0.10)TiO3 piezoelectric ceramics doped with La and Zr |
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Authors: | Pichitchai Butnoi Supalak Manotham Pharatree Jaita Chamnan Randorn Gobwute Rujijanagul |
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Affiliation: | 1. Department of Physics and Materials Science, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;2. Graduate School, Chiang Mai University, Chiang Mai 50200, Thailand;3. Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;4. Materials Science Research Center, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand |
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Abstract: | Properties of lead-free Bi0.5-xLaxNa0.40K0.10Ti0.98Zr0.02O3 (x?=?0.000–0.040) ceramics were investigated. All ceramics have a pure perovskite structure. A high energy storage density (~1.00?J/cm3) at room temperature (RT) is noted for the x?=?0.030 sample, while x?=?0.020 and 0.040 samples have very high thermal stability of energy storage density of ~3% (at 75–150?°C). Furthermore, the x?=?0.030 and 0.040 samples have the highest energy storage efficiency (η) value of 94% at 125?°C with high thermal stability (η?=?84–95% at 25–150?°C). The x?=?0.005 sample has high electric field-induced strain (Smax?=?0.42%) and high normalized strain coefficient (d*33?=?Smax/Emax?=?700?pm/V) with large improvements (~200% and 163% for Smax and d*33, respectively), as compared to the based composition. This ceramic system has potentials for piezoelectric and/or energy storage density applications. |
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Keywords: | BNKT Energy storage density Electric field-induced strain La-doped Lead-free ceramics |
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