无机材料学报2025，Vol.40Issue(6)：639-646,8.DOI:10.15541/jim20240476
Ba(Nd1/2Nb1/2)O3:一种被低估的K40微波介质陶瓷
Ba(Nd1/2Nb1/2)O3:An Underrated K40 Microwave Dielectric Ceramic
摘要
Abstract
Microwave dielectric ceramics are indispensable materials in the field of electronic communication,especially in high-frequency applications.They are widely used in microwave components such as resonators,filters,and oscillators due to their unique dielectric properties,including high relative dielectric constant(εr),low dielectric loss,and a temperature coefficient of resonant frequency(τf)close to zero.In this study,a Ba(Nd1/2Nb1/2)O3(BNN)ceramic with a medium dielectric constant was prepared,which was confirmed to be monoclinic system with the space group C12/m1 through X-ray diffraction(XRD)and Rietveld refinement.As the sintering temperature increasing,the samples'densities initially rose,reaching a maximum bulk density(ρobs)of 6.32 g/cm3 and a relative density(ρrel)of 98%at 1550℃before subsequently decreasing.The sample sintered at 1525℃showed the best microwave dielectric properties:εr=38.44,a quality factor Q×f=25400 GHz,and τf=-6×10-6℃-1.It is worth noting that compared to the previously reported value of 11700 GHz,the Q×f value of BNN ceramic in this study increased by 117%,indicating that the microwave dielectric properties of BNN ceramic may have been underestimated due to factors such as testing methods,raw material properties and processing conditions.In addition,a full-dielectric frequency selective surface(FSS)was designed and simulated using this ceramic material,achieving a relative bandwidth of about 23.3%,and demonstrating excellent frequency selection performance.These attributes underscore the potential of BNN ceramics for applications in microwave dielectric ceramic materials and affirm its previously underestimated capabilities,as evidenced by the remarkable performance observed in FSS simulation.关键词
微波介质陶瓷/中介电常数/复合钙钛矿/频率选择表面Key words
microwave dielectric ceramic/medium dielectric constant/composite chalcogenide/frequency selective surface分类
化学化工引用本文复制引用
何国强,姜佳沛,李祥坤,周迪,张恺恒,王震涛,包健,席兆琛,方振,王昌昊,王威,王鑫..Ba(Nd1/2Nb1/2)O3:一种被低估的K40微波介质陶瓷[J].无机材料学报,2025,40(6):639-646,8.基金项目
国家自然科学基金(U24A2052,52202146) （U24A2052,52202146）
中央高校基本业务费(xzy022024059)National Natural Science Foundation of China(U24A2052,52202146) （xzy022024059）
Fundamental Research Funds for the Central Universities(xzy022024059) （xzy022024059）
