TY - JOUR
T1 - Lead-free Ba(1-x)SrxTiO3 ceramics for room-temperature pyroelectric energy conversion
AU - Fan, Baoyan
AU - Yang, Guang
AU - Li, Ming Yu
AU - Liu, Pin
AU - Qiu, Shiyong
AU - Shen, Meng
AU - Liu, Huan
AU - Zhang, Guangzu
AU - Wang, Qing
AU - Jiang, Shenglin
N1 - Funding Information:
This research was supported by the National Science Foundation of China (Grant nos. 61675076 , U1532146 , 61705070 and 51772108 ), the National Key Research and Development Plan ( 2016YFB0402705 ), the China Postdoctoral Science Foundation (Grant nos. 2017M612449 and 2017T200545 ), Graduates' Innovation Fund, Huazhong University of Science and Technology ( 5003182005 ) and Shenzhen Science and Technology Project ( JCYJ20170307155115402 ). We would also like to acknowledge the Analytical and Testing Center of Huazhong University of Science and Technology .
PY - 2018/5
Y1 - 2018/5
N2 - Lead-free Ba(1-x)SrxTiO3 (BST) ceramics were fabricated to convert near-room-temperature waste heat to electric energy for creating self-powered and ‘battery-less’ systems. In comparison to thermoelectrics that are specifically used for harvesting heat with stable temperature span, pyroelectric converters based on Olsen cycle mechanism can harvest heat with temperature-vibration environment. Large energy conversion density (ND) was obtained in BST ceramics within the narrower temperature gradient (< 60 °C). In terms of the diffused phase transition (DPT) in BST ceramics, the extra slim hysteresis loops processed relatively low coercive field (Ec) and hysteresis loss, which can effectively enhance the ND owing to the wider electrical field interval. The effect of Curie temperature (Tc) tuned by the ratios of Ba/Sr on ND and applicable range of temperature were also systematically examined. At the same electrical field difference (07 MV/m), the optimal energy conversion properties were gained around the Tc, e.g., 0.36 J/cm3 for BST66/34 (Tc = 23 °C) within a temperature range between 25 °C and 65 °C, and 0.48 J/cm3 for BST72/28 (Tc = 43 °C) between 25 °C and 85 °C.
AB - Lead-free Ba(1-x)SrxTiO3 (BST) ceramics were fabricated to convert near-room-temperature waste heat to electric energy for creating self-powered and ‘battery-less’ systems. In comparison to thermoelectrics that are specifically used for harvesting heat with stable temperature span, pyroelectric converters based on Olsen cycle mechanism can harvest heat with temperature-vibration environment. Large energy conversion density (ND) was obtained in BST ceramics within the narrower temperature gradient (< 60 °C). In terms of the diffused phase transition (DPT) in BST ceramics, the extra slim hysteresis loops processed relatively low coercive field (Ec) and hysteresis loss, which can effectively enhance the ND owing to the wider electrical field interval. The effect of Curie temperature (Tc) tuned by the ratios of Ba/Sr on ND and applicable range of temperature were also systematically examined. At the same electrical field difference (07 MV/m), the optimal energy conversion properties were gained around the Tc, e.g., 0.36 J/cm3 for BST66/34 (Tc = 23 °C) within a temperature range between 25 °C and 65 °C, and 0.48 J/cm3 for BST72/28 (Tc = 43 °C) between 25 °C and 85 °C.
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U2 - 10.1016/j.ceramint.2018.02.009
DO - 10.1016/j.ceramint.2018.02.009
M3 - Article
AN - SCOPUS:85042027561
VL - 44
SP - 8270
EP - 8276
JO - Ceramics International
JF - Ceramics International
SN - 0272-8842
IS - 7
ER -