| 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 | |
| Corresponding Author | Luo, J.(jluo@aphy.iphy.ac.cn) |
| 2010-05-20 | |
| Source Publication | JOURNAL OF PHYSICAL CHEMISTRY C
 |
| ISSN | 1932-7447 |
| Volume | 114Issue:19Pages:8782-8786 |
| Abstract | 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. |
| Funding Organization | National Natural Science Foundation of China ; National Basic Research Program of China ; Chinese Academy of Sciences |
| DOI | 10.1021/jp1006928 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | National Natural Science Foundation of China[20851001] ; National Basic Research Program of China[2007CB925003] ; Chinese Academy of Sciences |
| WOS Research Area | Chemistry ; Science & Technology - Other Topics ; Materials Science |
| WOS Subject | Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary |
| WOS ID | WOS:000277500000014 |
| Publisher | AMER CHEMICAL SOC |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/100710 |
| Collection | 中国科学院金属研究所 |
| Corresponding Author | Luo, J. |
| Affiliation | 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 |
| Recommended Citation 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. |
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