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钙钛矿氧化物Sm_(1-x)Sr_xCoO_(3-δ)的非化学计量氧含量测定方法比较

Comparison of Methods in Determining Non-stoichiometric Oxygen Content of Perovskite Sm_(1-x)Sr_xCoO_(3-δ)
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摘要 采用碘定量滴定和X射线能谱分析对钙钛矿氧化物Sm1-xSrxCoO3-δ(x=0.2,0.3,0.5,0.7,0.8)体系进行了非化学计量氧含量的测定。研究表明,两种测试结果变化趋势一致,各有优劣。采用直流四探针法研究了氧空位浓度与导电性能的关系,结果表明,随着Sr掺量的增加,Sm1-xSrxCoO3-δ氧空位浓度增加,在x=0.5时导电性最佳,原因是氧空位浓度过高会导致空位团簇,减少有效空位,影响电子-离子的传导。 Iodometry titration and Xray spectroscopy analysis were applied to investigate the non-stoichiome- tric oxygen content of Sm1-xSrxCoO3-δ（x=0. 2, 0. 3,0. 5,0.7,0. 8）. The results indicate that these two methods ex- hibit their own superiority, and present the same trend. The relationship between oxygen vacancy concentration and electrical conductivity was studied by a four-probe DC method. The results show that with the increasing of Sr con- tent, the oxygen vacancies increased, and Sn0. 5 Sr0.5 CoO3-δ displayed the best electrical conductivity performance. High oxygen vacancies concentration leads to vacancy clusters, thus reducing the effective vacancies and influencing the transmission of electrons and ions.
作者 陆依 陈乐 陆春华 倪亚茹 许仲梓
机构地区 南京工业大学材料化学工程国家重点实验室
出处 《材料导报》 EI CAS CSCD 北大核心 2013年第8期105-108,116,共5页 Materials Reports
基金 江苏省研究生培养创新工程(CXZZ11_0329) 江苏省创新学者攀登项目(SBK200910148) 江苏省自然科学基金(BK2010553)
关键词 钙钛矿 非化学计量氧 碘定量滴定 X射线能谱分析 电导率 perovskite, non-stoichiometric oxygen, iodometry titration, X-ray spectroscopy, conductivity
分类号 TQ132 [化学工程—无机化工] TQ133 [化学工程—无机化工]
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参考文献14

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2013年 第8期

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