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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
Qian-feng Fang¤1,2, Zhong Zhuang2, Xian-ping Wang1,2, Dan Li2, Jian-xin Wang1
1.Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences, Ningbo 315040, China;2.Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences,Hefei 230031, China
Abstract:
Monte Carlo simulations were used to study the translocation of a flexible polymer through a pore in a membrane, assuming an attractive interaction between the monomers and the membrane on the trans side of the membrane and no interaction on the cis side. For the case TTc, τ increases with increasing temperature. The translocation time depends on the absorbed energy u0 in a nontrivial way. The value of τ increases initially upon increasing u0 before it begins to decrease.
Key words:  Oxide-ion conductor, La2Mo2O9, Dielectric relaxation, Oxygen ion diffusion
FundProject:市自然科学基金,国家自然科学基金
Phase Transition and Oxygen Ion Diffusion in (La1-xLnx)2Mo2O9 (Ln=Nd, Gd, x=0.05-0.25) Using Dielectric Relaxation Method
方前锋¤1,2, 庄重2, 王先平1,2, 李丹2, 王建新1
1.中国科学院宁波材料技术与工程研究所,宁波315040;2.中国科学院固体物理研究所材料物理重点实验室,合肥230031
摘要:
采用介电弛豫方法研究了氧离子导体(La1-xRex)2Mo2O9(Re=Nd, Gd, x=0.05-0.25)中氧离子扩散和相变行为. 观察到了两个介电损耗峰:第一个峰Pd在600 K附近,第二个峰Ph在720 K左右.Pd峰为弛豫型介电损耗峰,是由氧离子的短程扩散导致的. 随着频率增加,Ph峰基本上不随频率移动,但是峰高随着频率显著的下降.Ph峰表现出非弛豫型的本质,对应于氧离子和氧空位的分布从静态无序到动态无序的转变过程. 随着掺杂浓度的增加,Pd峰和Ph峰的峰高先是增加,在15%的掺杂量达到最高后开始降低. 与此对应,电导率也在此掺杂浓度下出现最大值.
关键词:  氧离子导体,La2Mo2O9,介电弛豫,氧离子扩散
DOI:10.1088/1674-0068/21/03/270-274
分类号: