摘要
在这项研究中,通过传统固相法得到了Bi_(0.47)Na_(0.47)Ba_(0.06)Cu_(0.015)Ti_(0.985)O_(3)(BNBCT)无铅压电陶瓷。系统研究了氧气氛围(BNBCT-O_(2))、空气氛围(BNBCT-Air)、氮气氛围(BNBCT-N_(2))对BNBCT陶瓷的结构与电性能的影响。X射线衍射(XRD)结果显示所有样品都只生成了钙钛矿结构。XRD精修结果则说明BNBCT-O_(2)陶瓷具有很强的晶格失序。复阻抗图谱、电响应活化能、电导率活化能以及O1s的X射线光电子能谱(XPS)反映出氧空位的浓度会随着烧结气氛的改变而改变。当烧结氛围中氧浓度过高时,样品中的氧空位浓度很容易被抑制。相比于BNBCT-Air与BNBCT-N_(2)陶瓷,BNBCT-O_(2)陶瓷表现出最高的压电常数(d_(33)=227 pC·N^(-1))及最大的剩余极化强度(P_(r)=31.9μC·cm^(-2))。这些结果均显示出BNBCT陶瓷的微观结构与电性能和氧空位浓度有关,而氧空位又能被烧结氛围所调控。所以,通过改变烧结氛围来提升Bi_(0.47)Na_(0.47)Ba_(0.06)Cu_(0.015)Ti_(0.985)O_(3)基陶瓷的压电性能是一种可行的方法。
Bi_(0.47)Na_(0.47)Ba_(0.06)Cu_(0.015)Ti_(0.985)O_(3)(BNBCT)lead-free piezoelectric ceramics were prepared by using the solid-state reaction technique.Samples were sintered at 1090℃ for 2 h in oxygen(BNBCT-O_(2)),air(BNBCT-Air),and nitrogen(BNBCT-N_(2)).Effects of sintering atmospheres on structure and electrical properties of the BNBCT ceramics were thoroughly studied.X-ray diffraction(XRD)results revealed that all samples exhibited pure perovskite phase.XRD Rietveld refinements confirmed that the BNBCT-O_(2) ceramics have strong lattice distortion.According to complex impedance spectra,the electrical response activation energy,activation energy of conductivity,and Ols X-ray photoelectron spectra(XPS),it is indicated that oxygen vacancy concentrations are different in different sintering atmosphere.When the oxygen content in sintering atmospheres is sufficiently high,oxygen vacancies can be easily inhibited.Compared with BNBCT-Air and BNBCT-N_(2),the BNBCT-O_(2) exhibited the highest piezoelectric coefficient(d_(33)=227 pC·N^(-1))and the largest remnant polarization(P_(r)=31.9μC·cm^(-2)).It is therefore concluded that the microstructure and electrical properties of BNBCT were related to oxygen vacancy concentration,which could be controlled by the sintering atmosphere.This work provides a feasible way to improve the piezoelectric properties of Bi_(0.47)Na_(0.47)Ba_(0.06)Cu_(0.015)Ti_(0.985)O_(3)-based ceramics by simply controlling the sintering atmosphere.
作者
胡江南
王俊
江向平
黄枭坤
陈超
聂鑫
王衔雯
HU Jiangnan;WANG Jun;JIANG Xiangping;HUANG Xiaokun;CHEN Chao;NIE Xin;WANG Xianwen(Jiangxi Key Laboratory of Advanced Ceramic Materials,School of Materials Science and Engineering,Jingdezhen Ceramic University,Jingdezhen 333403,Jiangxi,China)
出处
《陶瓷学报》
CAS
北大核心
2023年第6期1128-1138,共11页
Journal of Ceramics
基金
National Natural Science Foundation of China (52062018, 52162003)
the Excellent Youth Foundation of Jiangxi Province of China (20212ACB214007)
Key R&D Plan Projects of Jiangxi Province (20223BBE51018)
Natural Science Foundation of Jiangxi Province (20212BAB201019)
Key Projects of Jingdezhen (2021ZDGG002)。
关键词
压电陶瓷
钛酸铋钠
烧结氛围
电性能
piezoelectric ceramics
bismuth sodium titanate
atmosphere sintering
electrical properties.
