Phase structure analysis and pyroelectric energy harvesting performance of Ba(HfxTi1-x)O3 ceramics |
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| Authors: | Ming-Ding Li Xin-Gui Tang Si-Ming Zeng Qiu-Xiang Liu Yan-Ping Jiang Tian-Fu Zhang Wen-Hua Li |
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| Affiliation: | 1. School of Physics & Optoelectric Engineering, Guangdong University of Technology, Guangzhou, China;2. Laboratory Teaching Centre, Guangdong University of Technology, Guangzhou, China |
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| Abstract: | Ba(Ti1-xHfx)O3 ceramics were synthesized by a solid-state reaction process. The evolution of the phase structure was identified by XRD spectrum, dielectric spectroscopy, and temperature-dependent Raman spectroscopy for the Ba(Ti1-xHfx)O3 ceramics. In addition, pyroelectric energy harvesting properties based on the Olsen cycle were investigated for the first time. A maximum pyroelectric energy harvesting density value of ND = 491.30 kJ/m3 (ΔT = 120°C, EH = 50 kV/cm) was achieved in the Ba(Hf0.05Ti0.95)O3 ceramic. Compared with those of BT, the values of ND more than doubled in the temperature range from ΔT = 60°C to ΔT = 100°C in the Ba(Hf0.05Ti0.95)O3 ceramic and even increased 3.2 times at ΔT = 80°C near the Curie temperature (TC) of the Ba(Hf0.05Ti0.95)O3 sample. In addition, a larger pyroelectric energy harvesting density value of ND = 367.10 kJ/m3 (ΔT = 120°C, EH = 50 kV/cm) was acquired in the Ba(Hf0.12Ti0.88)O3 ceramic. Values of ND-BHT5/ND-BT and ND-BHT12/ND-BT were analyzed in the Ba(Ti1-xHfx)O3 ceramics. The optimal pyroelectric properties can be obtained in the vicinity of the ferroelectric to paraelectric phase-transition region. |
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| Keywords: | energy harvesting ferroelectric materials lead-free ceramics phase transition Raman spectra |
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