Oxygen diffusion and transport properties in non-stoichiometric Ln2-xNiO4+δ oxides
Oxygen diffusion and transport properties in non-stoichiometric Ln2-xNiO4+δ oxides
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DOI：
10.1016/j.ssi.2005.06.033
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发表时间：
2005-11-30
影响因子：
3.2
通讯作者：
Stevens, P
中科院分区：
文献类型：
--
作者：
Boehm, E;Bassat, JM;Stevens, P
制备了Ln（2-x-yy）Ca（x）NiO（4+delta）（其中（i）对于Ln = La、Pr、Nd，x = y = 0，（ii）当y = 0时x不等于0，或者对于Ln = Nd，x = 0时y不等于0）材料，并使用各种技术表征了它们的混合离子/电子导电性质。这些氧化物表现出高的电子电导率（在T = 700摄氏度时约为100 S cm（-1））以及高的氧扩散和表面交换系数值（D* 和k，使用180同位素的西姆斯分析确定）。在所研究的化合物中，Pr_2NiO_4 + δ的氧扩散性能最好。有趣的是，在Nd系列中，它们通过Nd空位的产生而略有改善，而它们受到Ca取代Nd的影响。(c)2005 Elsevier B. V.保留所有权利。
Materials formulated Ln(2-x-y y)Ca(x)NiO(4+delta) (with (i) x = y = 0 for Ln = La, Pr, Nd, (ii) x not equal 0 when y = 0 or y not equal 0 when x = 0 for Ln = Nd) have been prepared and characterized using various techniques with respect to their mixed ionic/electronic conducting properties. These oxides exhibit high electronic conductivity (approximate to 100 S cm(-1) at T = 700 degrees C) as well as high values of oxygen diffusion and surface exchange coefficients (D* and k, determined using SIMS analysis of the 180 isotope). The oxygen diffusion performances of Pr2NiO4+delta are the highest ones among those of the studied compounds. Interestingly, in the Nd-series they are slightly improved by the creation of Nd vacancies, while they are affected by the substitution of Nd by Ca. (c) 2005 Elsevier B.V. All rights reserved.