摘要
拟通过添加ZnO和Na2CO3来提高钇掺杂锆铈酸钡质子导体陶瓷的烧结性能和电导率,采用机械球磨混合结合高温常压烧结工艺制备了ZnO/Na2CO3复合的BaZr0.1Ce0.7Y0.2O3-δ(BZCY)质子导体陶瓷。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、能谱(EDS)和电化学阻抗谱(EIS)对烧结陶瓷的物相、微观形貌、化学成分和电导率进行了测试表征。XRD结果显示ZnO/Na2CO3复合并没有改变BZCY的晶型。当烧结温度为1550℃保温6 h时,BZCY陶瓷的致密度和线性收缩率最大,分别达到96.15%和12.44%;添加1%ZnO(摩尔分数)后,烧结温度可降低至1350℃,陶瓷的致密度和线性收缩率分别达到96.87%和16.11%,可见,ZnO的添加可以大大提高BZCY的烧结性能。当添加10%(摩尔分数)Na2CO3后,陶瓷的晶粒尺寸约5~10μm,且没有引起BZCY的致密度和线性收缩率的显著降低。700℃时BZCY-1%ZnO-10%Na2CO3陶瓷的电导率可达1.225×10-2S·cm-1,而未添加Na2CO3的BZCY陶瓷的电导率仅为4.511×10-3 S·cm-1,电导率提高了约2.7倍,添加Na2CO3显著提高了BZCY-1%ZnO陶瓷的电导率。
In order to improve the sintering performance and electrical conductivity of yttrium-doped Ba(ZrCe) O3-δ proton conducting ceramic,the ZnO and Na2 CO3 were added and the proton conducting ceramic of BaZr0.1Ce0.7Y0.2O3-δ(BZCY)+ZnO/Na2 C03 was prepared by mechanical ball milling combined with high temperature sintering in air atmosphere.The ciystalline structure,micro-morphology,chemical composition and electrical properties of the sintering ceramics were characterized by X-ray diffraction(XRD),scanning electron microscope(SEM),energy dispersive spectrometer(EDS) and electrochemical impedance spectroscopy(EIS),respectively.XRD showed that the addition of ZnO and Na2 C03 did not change the ciystal structure of BZCY.When the BZCY ceramics were sintered at 1550℃for 6 h,the relative density and linear shrinkage were optimal,i.e.,96.15% and 12.44%.The sintering temperature could be lowered to 1350 when the 1% ZnO was added,and the relative density and linear shrinkage could reach 96.87% and16.11%,respectively,and it could be seen that the addition of ZnO could greatly enhance the sintering properties of BZCY.The grains size of BZCY-1%ZnO ceramic with the Na2 C03 content of 10 mol% was about 5~10 μm and the addition of Na2 C03 did not decrease significantly in the relative density and linear shrinkage of BZCY.The Na2 CO3 addition was beneficial to improve the electrical conductivity of the BZCY-1%ZnO ceramic.At 700℃,the electrical conductivity of BZCY-1%ZnO-10%Na2 CO3 ceramic was optimal at 700℃,i.e.,1.225×10-2S·cm-1,while that of the BZCY-1%ZnO ceramic was only 4.511×10-3S·cm-1,the electrical conductivity increased by about 2.7 times.
作者
罗先游
赵梦媛
解昊
边凌锋
杨星
孟彬
Luo Xianyou;Zhao Mengyuan;Xie Hao;Bian Lingfeng;Yang Xing;Meng Bin(Faculty of Material Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China)
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2020年第4期410-418,共9页
Chinese Journal of Rare Metals
基金
国家自然科学基金项目(51462018)
云南省大学生创新创业训练计划项目(201710674203)资助。
