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Phase Transition and Oxygen Ion Diffusion in （La1-xLnx）2Mo2O9 （Ln=Nd, Gd, x=0.05-0.25） Using Dielectric Relaxation Method

ISSN号：1674-0068
期刊名称：《化学物理学报》
时间：0
分类：O64[理学—物理化学;理学—化学]
作者机构：[1]Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo315040, China, [2]Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences,Hefei 230031, China
相关基金：This work was supported by the Ningbo Civic Natural Science Foundation （No.2006A610057）, the Ningbo Civic Project of International Cooperation （No.2006B100080）, Zhejiang Provincial Project of International Cooperation （No.2007C24022）, and the National Natural Science Foundation of China （No.50672100 and No.50702061）.

作者： Qian-feng Fang[1,2], Zhong Zhuang[2], Xian-ping Wang[1,2], Dan Li[2], Jian-xin Wang[1]

关键词：氧离子导体, La2Mo2O9, 介电驰豫, 氧离子扩散, Oxide-ion conductor, La2Mo2O9, Dielectric relaxation, Oxygen ion diffusion

中文摘要：

绝缘的松驰方法被采用在氧化物离子售票员(La1xLnx ) 学习氧离子散开和阶段转变的性质 2Mo2O9 (行 = Nd， Gd， x = 0.05-0.25 ) 。二座绝缘的损失山峰被观察：在在 720 K 附近的大约 600 K 和山峰 Ph 的山峰 Pd。山峰 Pd 是一座 relaxational 山峰并且与联系短期氧离子的散开当山峰 Ph 几乎不改变它的位置并且戏剧性地与增加频率在高度减少时，展出 non-relaxational 自然。与增加 Ln3+ 集中，山峰 Ph 和 Pd 的高度起初增加然后在在 15% 做传递最大值以后减少。山峰 Ph 与到在氧离子 / 空缺分发的一个动态混乱状态的一个静态的混乱状态的阶段转变有关，这被建议。15%Gd 或 15%Nd 做了 La2Mo2O9 样品，这被发现在这个做的内容根据山峰 Pd 的最高的高度展出最高的传导性。

英文摘要：

Dielectric relaxation method was employed to study the properties of oxygen ion diffusion and phase transition in the oxide-ion conductors （Lal-xLnx）2Mo209 （Ln=Nd, Gd, x=0.05-0.25）. Two dielectric loss peaks were observed： peak Pd at about 600 K and peak P5 around 720 K. Peak Pd is a relaxational peak and associated with the short-range diffusion of oxygen ions, while peak P5 hardly changes its position and dramatically decreases in height with increasing frequency, exhibiting non-relaxational nature. With increasing Ln^3＋ concentration, the heights of peak Ph and Pd increase at first and then decrease after passing a maximum at 15% doping. It is suggested that peak P5 is related to the phase transition of a static disordered state to a dynamic disordered state in oxygen ions/vacancies distribution. It is found that the 15%Gd or 15%Nd doped La2Mo209 samples exhibit the highest conductivity in accordance with the highest height of peak Pd at this doping content.

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