Series of modulated structures in SrxCoO2 and the modulation rule

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	Series of modulated structures in SrxCoO2 and the modulation rule
	Yao, LD ; Guo, YQ ; Luo, JL ; Zhang, W ; Li, FY ; Jin, CQ ; Yu, RC
刊名	PHYSICAL REVIEW B
	2007
卷号	75 期号:17
ISSN号	1098-0121
中文摘要	The nominal composition of Sr0.39CoO2, prepared by a low-temperature ion exchange technique, has been systematically studied by transmission electron microscopy, energy dispersive x-ray spectroscopy (EDX), and electron-energy-loss spectroscopy (EELS). Besides a well-defined root 3 and a(p) x root 3a(p) modulated structure, a series of long periodic modulated structures (n root 3a(p) x 3a(p)) was revealed by high-resolution transmission electron microscopy (HRTEM) in some microzones, which are induced by alternate position ordering of strontium ions. The results of EDX analyses confirm the variation of Sr content in corresponding modulated phases. Moreover, the L-3/L-2 intensity ratio of Co-L-2,L-3 edges in the EELS spectra indicates the variation of Co ionic valence state induced by the different contents of Sr cations. Based on the root 3a(p) x 3a(p) superstructural model, we propose the possible corresponding structural models in this paper. The simulated HRTEM images, based on those models, are consistent with experimental ones. In addition, several phase separations and some structural defects were observed in the sample.
收录类别	SCI
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/52491]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Yao, LD,Guo, YQ,Luo, JL,et al. Series of modulated structures in SrxCoO2 and the modulation rule[J]. PHYSICAL REVIEW B,2007,75(17).
APA	Yao, LD.,Guo, YQ.,Luo, JL.,Zhang, W.,Li, FY.,...&Yu, RC.(2007).Series of modulated structures in SrxCoO2 and the modulation rule.PHYSICAL REVIEW B,75(17).
MLA	Yao, LD,et al."Series of modulated structures in SrxCoO2 and the modulation rule".PHYSICAL REVIEW B 75.17(2007).