锌掺杂La_(9.33)(SiO_4)_6O_2电解质的制备与电导率研究  

Preparation of Zn Doped La_(9.33)(SiO_4)_6O_2 Electrolyte and Its Conductivity

作　　者：雷红 李文昭[1] 马东 黄志良[1] LEI Hong;LI Wenzhao;MA Dong;HUANG Zhiliang(School of Materials Science and Engineering,Wuhan Institute of Technology,Wuhan 430205,Chin)

机构地区：[1]武汉工程大学材料科学与工程学院,湖北武汉430205

出　　处：《武汉工程大学学报》2018年第4期400-404,共5页Journal of Wuhan Institute of Technology

基　　金：国家自然科学基金(51374155);湖北省科技支撑计划(2014BCB034;2015BAA105);湖北省自然科学基金(2014CFB796)

摘　　要：为改善固体电解质在中低温(500℃~800℃)下的电导性能,通过尿素-硝酸盐燃烧法,以La_2O_3及ZnO等为原料,制备了Zn掺杂磷灰石型La_(9.33)(SiO_4)_6O_2(LSO)电解质。采用X-射线衍射仪、扫描电子显微镜及傅里叶变换红外光谱仪对掺杂得到的样品进行表征。Zn取代Si掺杂进入到LSO的晶格中对晶体结构以及形貌影响很小,锌掺杂的LSO电解质粉体在煅烧12 h后,已经具有磷灰石型晶体结构。对烧结体进行交流阻抗测试分析,实验制备的La_(9.33)Si_(6-x)Zn)xO_(26-y)具有良好的电导率。适量的掺杂可以有效提高电解质的电导率,当Zn掺杂量摩尔比x=1.0时,在500℃下La_(9.33)Si_(6-x)Zn)xO_(26-y)离子电导率最高为2.1×10^(-2)S/cm,Zn掺杂La_(9.33)Si_(6-x)Zn)xO_(26-y)电解质的最佳烧结温度为1 250℃。To improve the conductivity of solid electrolyte at the temperatures of 500 ℃-800 ℃,the electrolyte of Zn doped La9.33Si6-xZn）xO26-ywas prepared by urea nitrate combustion method using La2O3 and ZnO as raw materials. The samples were characterized by X-ray diffraction,scanning election microscopy and Fourier transform infrared spectroscopy. Zn partially replaced Si from the lattice of apatite type La9.33（SiO4）6O2（LSO）,wielding little influence over on the crystal structure and morphology. Zn doped LSO appeared apatite crystal structure after the calcination for 12 h. The alternating current impedance tests showed that the La9.33Si6-xZn）xO26-y electrolyte had good conductivity. The moderate doping amount effectively improved the conductivity of theelectrolyte. The La9.33Si6-xZn）xO26-yhad the highest ionic conductivity of 2.1 × 10^-2 S/cm in mole ratio 1.0 of Zndoping at 500 ℃,and the best sintering temperature for the Zn doped La9.33Si6-xZn）xO26-yelectrolyte was 1 250 ℃.

关 键 词：燃烧合成 固体电解质 硅酸镧 离子电导率 掺杂 

分 类 号：O646[理学—物理化学]