Multilayer Lead-Free Ceramic Capacitors with Ultrahigh Energy Density and Efficiency.
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TL;DR: The newly developed capacitor exhibits a wide temperature usage range of -60 to 120 °C, with an energy-density variation of less than 10%, and satisfactory cycling reliability, with degradation of more than 8% over 106 cycles demonstrate that the NBT-0.45SBT multilayer ceramic is a promising candidate for high-power energy storage applications.
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Abstract: The utilization of antiferroelectric (AFE) materials is thought to be an effective approach to enhance the energy density of dielectric capacitors. However, the high energy dissipation and inferior reliability that are associated with the antiferroelectric-ferroelectric phase transition are the main issues that restrict the applications of antiferroelectric ceramics. Here, simultaneously achieving high energy density and efficiency in a dielectric ceramic is proposed by combining antiferroelectric and relaxor features. Based on this concept, a lead-free dielectric (Na0.5 Bi0.5 )TiO3 -x(Sr0.7 Bi0.2 )TiO3 (NBT-xSBT) system is investigated and the corresponding multilayer ceramic capacitors (MLCCs) are fabricated. A record-high energy density of 9.5 J cm-3 , together with a high energy efficiency of 92%, is achieved in NBT-0.45SBT multilayer ceramic capacitors, which consist of ten dielectric layers with the single-layer thickness of 20 µm and the internal electrode area of 6.25 mm2 . Furthermore, the newly developed capacitor exhibits a wide temperature usage range of -60 to 120 °C, with an energy-density variation of less than 10%, and satisfactory cycling reliability, with degradation of less than 8% over 106 cycles. These characteristics demonstrate that the NBT-0.45SBT multilayer ceramic is a promising candidate for high-power energy storage applications.
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Citations
Investigation on Discharge Behavior of Antiferroelectric Multilayer Ceramic Capacitors
TL;DR: In this article , multilayer ceramic capacitors (MLCCs) made of lead lanthanum zirconate titanate were manufactured using the laminate co-firing method, and discharge characteristics were examined.
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High energy storage of PbZrO3 antiferroelectric thin films via constructing phase composition
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TL;DR: High energy storage performance of PbZrO3 thin films via constructing phase composition. The phase composition of PbZrO3 thin films can be tuned by annealing temperature, leading to different energy storage properties.
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Densification and fine-grain formation mechanisms of BaTiO3 ceramics consolidated by self-assembly sintering
TL;DR: In this paper, the authors studied the mechanism of balancing the densification and grain growth via cosintering the micron and nanopowders, also known as self-assembly sintering.
Atomic-scale insight into the tetragonal platelets correlated with the antiferroelectricity in Na0.5Bi0.5TiO3-based materials
Hai Lu,Haosu Luo,Jing Zhu +2 more
TL;DR: The structural origin of antiferroelectric (AFE)-like double P-E loops near the depolarization temperature in lead-free Na0.5Bi 0.5TiO3 (NBT)-based materials remains elusive despite decades of study as discussed by the authors .
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