Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 826, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2020.154160
Keywords
Barium titanate; Calcium stannate; Solid solubility; Pb-free ceramics; Energy storage
Categories
Funding
- National Natural Science Foundation of China [51672226, U1504525]
- Fundamental Research Funds for the Central Universities [XDJK2018B009]
- Chongqing Research Program of Basic Research and Frontier Technology [cstc2018jcyjAX0356]
- National College Student innovation and Entrepreneurship Program of Southwest University [201910635038]
- State Key Laboratory of Electrical Insulation and Power Equipment [EIPE19209]
- Experimental Technology Research Projects of Southwest University [SYJ2019011]
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Pb-free bulk (1-x)BaTiO3-xCaSnO(3), (x = 0.05, 0.10, 0.15, 0.20 mol) ceramics were fabricated with traditional electroceramic processing technology, and the influences of CaSnO3 on the microstructure, morphology, and electrical performance were systemically investigated. All doped ceramics exhibit a single perovskite structure according to the X-ray diffraction (XRD) and Raman spectra. Moreover, the modification mechanism of co-doping with Ca and Sn was investigated. CaSnO3 effects the grain refinement significantly, shifts the phase transition peak to lower temperatures, and enhances the relaxor behaviour. According to the impedance spectra, its effect on the insulation performance transforms from grain boundary contribution to grain contribution as the substitution content increases. When the substitution content is 0.15 mol, the maximum dielectric breakdown strength (BDS) and the maximum energy storage density reach 230 kV/cm, and 1.57 J/cm(3), respectively. Furthermore, the BT-0.15CS ceramic shows very good temperature, frequency, fatigue resistance, and charge-discharge performances, which makes it suitable for energy storage applications. (C) 2020 Elsevier B.V. All rights reserved.
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