Enhancement of pyroelectric properties of lead-free 0.94Na0.5Bi0.5TiO3-0.06BaTiO3 ceramics by La doping |
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| Affiliation: | 1. Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 1295 Dingxi Road, Shanghai 200050, People''s Republic of China;2. University of the Chinese Academy of Sciences, Beijing 100049, People''s Republic of China;1. Department of Microelectronic Science and Engineering, Ningbo University, 315211 Ningbo, China;2. Key Laboratory of Photoelectric Materials and Devices of Zhejiang Province, Ningbo University, 315211 Ningbo, China;1. College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, 310018, China;2. College of Materials Science and Engineering, China Jiliang University, Hangzhou, 310018, China;3. Functional Materials Research Laboratory, School of Materials Science & Engineering, Tongji University, No. 4800 Caoan Highway, Shanghai, 201804, China;1. Department of Mechanical Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan;2. Department of Mechanical Engineering, Hwa Hsia University of Technology, New Taipei City 23567, Taiwan;3. Department of Physics, Fu Jen Catholic University, New Taipei City 24205, Taiwan;4. Department of Physics, University of San Carlos, Cebu 6000, Philippines |
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| Abstract: | Lead-free 0.94NBT-0.06BT-xLa ceramics at x = 0.0–1.0 (%) were synthesized by a conventional solid-state route. XRD shows that the compositions are at a morphotropic phase boundary where rhombohedral and tetragonal phases coexist. With increasing La3+ content pyroelectric coefficient (p) and figures of merits greatly increase; however, the depolarization temperature (Td) decreases. p is 7.24 × 10−4C m−2 °C−1 at RT at x = 0.5% and 105.4 × 10−4C.m−2 °C−1 at Td at x = 0.2%. Fi and Fv show improvements at RT from 1.12 (x = 0%) to 2.65 (x10 −10 m v−1) (x = 0.5%) and from 0.021 to 0.048 (m2.C−1) respectively. Fi and Fv show a huge increase to 37.6 × 10−10 m v−1 and 0.56 m2 C−1 respectively at Td at x = 0.2%. FC shows values of 2.10, 2.89, and 2.98 (x10−9C cm−2 °C−1) at RT at 33, 100 and 1000 (Hz) respectively. Giant pyroelectric properties make NBT-0.06BT-xLa at x = 0.2% and 0.5% promising materials for many pyroelectric applications. |
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| Keywords: | Lead free ceramics Lanthanum doping NBT-0 06 BT Depolarization temperature Pyroelectric properties Figure of merits |
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