Tuning Magnetic Properties of alpha-MnO(2) Nanotubes by K(+) Doping

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	Tuning Magnetic Properties of alpha-MnO(2) Nanotubes by K(+) Doping
	J. Luo; H. T. Zhu; J. K. Liang; G. H. Rao; J. B. Li; Z. M. Du
	2010
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-K(x)MnO(2) nanotubes with x = 0.10, 0.12, 0.15, and 0.17 have been synthesized through acid and alkali treatments of the precursor alpha-MnO(2) 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 Mn(3+) and Mn(4+) 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 Mn(3+)/Mn(4+) 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 Mn(3+) and Mn(4+). Our experiments display that the magnetic properties of alpha-K(x)MnO(2) can be tuned by varying the K(+) content.
部门归属	[luo, j.; zhu, h. t.; liang, j. k.; rao, g. h.; li, j. b.] chinese acad sci, inst phys, beijing natl lab condensed matter phys, beijing 100190, peoples r china. [zhu, h. t.; du, z. m.] univ sci & technol beijing, dept mat sci & engn, beijing 100083, peoples r china. [liang, j. k.] chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china.;luo, j (reprint author), chinese acad sci, inst phys, beijing natl lab condensed matter phys, beijing 100190, peoples r china;jluo@aphy.iphy.ac.cn
关键词	Hydrothermal Synthesis Manganese-dioxide Hollow Urchins Tunnel Phase Transitions Nanowires Growth Oxides
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31353
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. Luo,H. T. Zhu,J. K. Liang,et al. Tuning Magnetic Properties of alpha-MnO(2) Nanotubes by K(+) Doping[J]. Journal of Physical Chemistry C,2010,114(19):8782-8786.
APA	J. Luo,H. T. Zhu,J. K. Liang,G. H. Rao,J. B. Li,&Z. M. Du.(2010).Tuning Magnetic Properties of alpha-MnO(2) Nanotubes by K(+) Doping.Journal of Physical Chemistry C,114(19),8782-8786.
MLA	J. Luo,et al."Tuning Magnetic Properties of alpha-MnO(2) Nanotubes by K(+) Doping".Journal of Physical Chemistry C 114.19(2010):8782-8786.