Ying Lu,Xiaochun Wang,Peng Li,Juan Du,Peng Fu,Jigong Hao,Wei Li
Ceramic capacitors having great energy-storage performance (ESP) are receiving more and more concern in the electronics industry. In this paper, high ESP is obtained in 0.6Bi 0.5 Na 0.5 TiO 3 –0.4Bi 0.2 Sr 0.7 TiO 3 (BNT-BST)-based samples through doping the Sr(Sc 0.5 Nb 0.5 )O 3 (SSN) component. The results show that the recoverable energy density ( W rec ) and efficiency ( η ) of the materials will be significantly improved by adjusting the relaxation characteristics and domain structure engineering. In addition, the breakdown filed of ceramics is also improved by inhibition grain growth. The BNT-BST-0.15SSN ceramic has achieved high comprehensive ESP ( W rec = 5.49 J/cm 3 , η = 93.6 %) at an electric field of 455 kV/cm. Meanwhile, the ceramic shows outstanding temperature (25–160 °C), frequency (1–500 Hz) and cycle (1–10 4 ) stability (the variation of W rec / η < 5 %). Therefore, the BNT-BST-0.15SSN ceramic is expected to be a suitable candidate of environmentally friendly materials as advanced pulsed capacitor application.
Dandan Zhang,Xiuli Zhang,Xingjia Li,Zhu Liang,Haisheng Xu,Zhaoyue Lv,Xiaodong Sang,Saisai Li
In recent years, compared with traditional refrigeration technology, the electrocaloric refrigeration technology has been applied in variety of green cooling devices due to its high efficiency and environmentally friendly. Recent findings reveal that the ceramic system with additives (such as, LiBiO 2 , PbO) can create large ECE under low electric field. In this work, the ternary glass BaO–CaO–SiO 2 (BCS) was used as a sintering aid to enhance the electrocaloric (EC) response of 0.2Ba(Ti 0.9 Sn 0.1 )O 3 -0.8Ba(Zr 0.18 Ti 0.82 )O 3 (BZSnT20) bulk ceramics. The EC properties of BZSnT20 could be also improved via controlling sintering temperature and the content of BCS sintering aid. It was found that BZSnT20 with 0.5 wt% BCS show the maximum EC response of 3.2 K under 7 MV/m with sintering temperature of 1262 °C. These results demonstrated that the ECE of BZSnT20 can be boosted by using appropriate additives, which provides an effective route to realize large ECE under low electric fields.
Linjiang Yu,Jia Dong,Mingyang Tang,Yi Liu,Fei Wu,Yan Yan,Gang Liu,Chunlin Song
A conventional preparation method of electroceramics was used to synthesise Pb-free 0.85Na 0.5 Bi 0.5 TiO 3 -0.15CaTiO 3 - x La (NBT-CT- x La) ceramics. La 3+ doping effectively refined the grains and enhanced the dielectric breakdown strength (BDS) of the ceramics; this result was confirmed by numerical simulations, which revealed that grain refinement significantly contributed to the enhancement of the BDS. The energy storage density consequently improved when an appropriate amount of La 3+ was added to the NBT-CT ceramics. In particular, the NBT-CT-0.75La ceramic displayed a maximum energy storage density of 2.15 J/cm 3 and a high BDS of 210 kV/cm. This ceramic also possessed relatively excellent temperature and frequency stabilities (30–150 °C, 0.2–200 Hz). Moreover, the ceramics exhibited exceptional charge–discharge performances, with an outstanding power density of 43.87 MW/cm 3 , which is nearly twice of that of other NBT-based ceramics. On the basis of the findings, the NBT-CT-0.75La ceramic can be considered to be a promising candidate material for the pulsed power application.
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