摘要
In this work,a traditional solid-state method was adopted to prepare dense Ba_(0.85)Ca_(0.15)[(Zr_(0.1)Ti_(0.9))_(1-x)–(Nb_(0.5)La_(0.5))_(x)]O_(3)(BCZT–xNL)lead-free relaxation ferroelectrics with excellent energy storage performance(ESP).Remarkably,a large breakdown field strength of BDS(-410 kV/cm)resulting from decreased grain size by double ions doping at the B-site was achieved in BCZT–xNL ceramics.Especially,the BCZT–0.12NL ceramic displays a good recoverable energy density(W_(rec))of 3.1 J/cm^(3),a high efficiency of 86.7%(η)and a superior fatigue resistance,as well as a superior charge–discharge performance(C_(D)-1623.14 A/cm^(2),P_(D)-162.31 MW/cm^(3),W_(D)-1.30 J/cm^(3),t_(0.9)-49.6 ns)and good thermal stability.Besides,upon NL doping,the FE to RFE phase transition results in a dielectric behavior traversing the relaxation phase(γ-1.84)accompanied by frequency dispersion,which is beneficial to improve ESP.The superior ESP in this work indicates that BCZT–0.12NL ceramics are a promising candidate used in energy storage capacitors.
基金
supported by the National Science Foundation of China(NSFC)(Grant Nos.52272119 and 52202143)
The authors would also like to thank the Natural Science Basic Research Plan in the Shaanxi Province of China(Grant No.2022JQ338)
Young Talent Fund of University Association for Science and Technology in Shaanxi,China(20230415)
the Fundamental Research Funds for the Central Universities(Grant No.GK202401009)
Key Research and Development Program of Shaanxi Provincial Science and Technology Department(Grant No.2023-YBGY-162)
the Fundamental Innovation Project in School of Materials Science and Engineering(SNNU).
