Tuning Magnetic Properties of alpha-MnO2 Nanotubes by K+ Doping

doi:10.1021/jp1006928

IMR OpenIR

	Tuning Magnetic Properties of alpha-MnO2 Nanotubes by K+ Doping
	Luo, J.1; Zhu, H. T.1,2; Liang, J. K.1,3; Rao, G. H.1; Li, J. B.1; Du, Z. M.2
通讯作者	Luo, J.(jluo@aphy.iphy.ac.cn)
	2010-05-20
发表期刊	JOURNAL OF PHYSICAL CHEMISTRY C
ISSN	1932-7447
卷号	114 期号:19 页码:8782-8786
摘要	alpha-KxMnO2 nanotubes with x = 0.10, 0.12, 0.15, and 0.17 have been synthesized through acid and alkali treatments of the precursor alpha-MnO2 nanotubes. For the samples with x = 0.10 and 0.12, a large divergence of the ZFC and FC susceptibilities and pronounced hysteresis at low temperature are observed. However, the samples with x = 0.15 and 0.17 are antiferromagnetic with Neel temperatures of 25.4 and 25.3 K, respectively. The reciprocal susceptibility and electrical conductivity indicate that the samples with x = 0.15 and 0.17 undergo a charge separation transition from mixed/averaged valence state manganese ions to Mn3+ and Mn4+ between 250 and 300 K. Below half occupancy of the K+ site (x <= 0.125), the strong geometrical frustration due to the triangular lattice configuration and the mixture of Mn3+/Mn4+ result in the spin-glass behavior of the samples with x = 0.10 and 0.12. Above half occupancy of the K+ site, the samples with x = 0.15 and 0.17 exhibit an antiferromagnetic feature due to the charge separation of Mn3+ and Mn4+. Our experiments display that the magnetic properties of alpha-KxMnO2 can be tuned by varying the K+ content.
资助者	National Natural Science Foundation of China ; National Basic Research Program of China ; Chinese Academy of Sciences
DOI	10.1021/jp1006928
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[20851001] ; National Basic Research Program of China[2007CB925003] ; Chinese Academy of Sciences
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science
WOS类目	Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS记录号	WOS:000277500000014
出版者	AMER CHEMICAL SOC
引用统计	被引频次：65[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/100711
专题	中国科学院金属研究所
通讯作者	Luo, J.
作者单位	1.Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China 2.Univ Sci & Technol Beijing, Dept Mat Sci & Engn, Beijing 100083, Peoples R China 3.Chinese Acad Sci, Int Ctr Mat Phys, Shenyang 110016, Peoples R China
推荐引用方式 GB/T 7714	Luo, J.,Zhu, H. T.,Liang, J. K.,et al. Tuning Magnetic Properties of alpha-MnO2 Nanotubes by K+ Doping[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2010,114(19):8782-8786.
APA	Luo, J.,Zhu, H. T.,Liang, J. K.,Rao, G. H.,Li, J. B.,&Du, Z. M..(2010).Tuning Magnetic Properties of alpha-MnO2 Nanotubes by K+ Doping.JOURNAL OF PHYSICAL CHEMISTRY C,114(19),8782-8786.
MLA	Luo, J.,et al."Tuning Magnetic Properties of alpha-MnO2 Nanotubes by K+ Doping".JOURNAL OF PHYSICAL CHEMISTRY C 114.19(2010):8782-8786.