In、Ta共掺对BaCeO_3烧结性能及稳定性的影响  

Effects of In, Ta Co-doped on the Sinterability and Stability of BaCeO_3

作　　者：杨春利[1] 严敏[1] 李伟[2] 

机构地区：[1]西安建筑科技大学材料与矿资学院功能材料研究所,西安710055 [2]湖北航天化学技术研究所固体推进剂高能与安全技术重点实验室,襄阳441003

出　　处：《无机材料学报》2016年第9期955-960,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金青年科学基金(21506168);高等学校博士学科点专项科研基金(20126120120018);西安建筑科技大学人才科技基金(RC1251);陕西省教育厅自然科学专项(2013JK0901)~~

摘　　要：采用改进的柠檬酸盐法制备了不同In、Ta掺杂量的BaCeO_3基质子导体粉体,干压成型后分别在1150℃、1250℃和1350℃下进行烧结。采用X射线衍射仪、扫描电镜分别对质子导体的物相结构和微观形貌进行了表征,并采用电化学工作站测定了样品不同温度下的电导率。结果表明,1350℃烧结样品气孔率均小于10%,并且In掺杂量越高越容易烧结。样品在CO_2和H_2O中的化学稳定性测试结果表明,只掺杂In可以提高样品在水中的化学稳定性,但是对粉末样品高浓度CO_2气氛下的稳定性影响不大。In、Ta共掺杂可以大幅度提高样品在CO_2中的稳定性,且稳定性随着Ta掺杂量的增加而提高。但是样品在10%湿润氢气气氛下的电导率随着Ta含量的增加而降低,其中,BaCe_(0.7)In_(0.25)Ta_(0.05)O_(3–δ)在800℃时湿氢气下的电导率为1.16×10^(-3) S/cm。BaCe0.7In0.3-xTaxO3-δ powders were synthesized by a modified citrate method. The powders were pressed into pellets, and then sintered at 1150℃, 1250℃ and 1350℃. The phase composition and the micro- structure were investigated by using X-ray diffraction patterns and scanning electron microscope, respectively. The conductivity was measured by AC impedance method. The results indicate that porosities of the samples sintered at 1350℃ are less than 10% and the sample＇s sinterability becomes better with the increasing doping amount of In. The doping of In can improve stability of the BaCeO3 based powders against water, but not improve its stability against high concentration CO2. However, Co-doping with In and Ta definitely improves the samples＇ resistance against CO2 and the higher Ta-doping level, the much more stability is, while the conductivities in wet H2 decrease. Conductivity of the BaCe0.7In0.25Ta0.05O3-δ sample at 800℃ in wet 10% H2 atmosphere reaches 1.16 ×10^-3 S/cm.

关 键 词：BACEO3 In掺杂 Ta掺杂 烧结活性 化学稳定性 

分 类 号：TQ13[化学工程—无机化工]