| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Canted antiferromagnetic and optical properties of nanostructures of Mn2O3 prepared by hydrothermal synthesis |
| Qurat-ul-ain Javed, Wang Feng-Ping, M. Yasir Rafique, Arbab Mohammad toufiq, M. Zubair Iqbal |
| Department of Physics, School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China |
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Abstract We have reported new magnetic and optical properties of Mn2O3 nanostructures. The nanostructures have been synthesized by hydrothermal method combined with the adjustment of pH values in the reaction system. The particular characteristics of the nanostructures have been analyzed by employing X-Ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), Raman spectroscopy (RS), UV-visible spectroscopy, and the vibrating sample magnetometer (VSM). Structural investigation manifests that the synthesized Mn2O3 nanostructures are orthorhombic crystal. Magnetic investigation indicates that the Mn2O3 nanostructures are antiferromagnetic and the antiferromagnetic transition temperature is at TN = 83 K. Furthermore, the Mn2O3 nanostructures possess canted antiferromagnetic order below the Neel temperature due to spin frustration, resulting in hysteresis with large coercivity (1580 Oe) and remanent magnetization (1.52 emu/g). The UV-visible spectrophotometry was used to determine the transmittance behavior of Mn2O3 nanostructures. Direct optical band gap of 1.2 eV was acquired by using Davis-Mott model. The UV-visible spectrum indicates that the absorption is prominent in visible region, and transparency is more than 80% in UV region.
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Received: 26 June 2012
Revised: 14 July 2012
Accepted manuscript online:
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PACS:
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73.63.Bd
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(Nanocrystalline materials)
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78.40.-q
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(Absorption and reflection spectra: visible and ultraviolet)
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75.10.-b
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(General theory and models of magnetic ordering)
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75.75.-c
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(Magnetic properties of nanostructures)
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| Fund: Project supported by the Fundamental Development Fund and Chancellor Scholarship Program, China (Grant No. YJ2010-014) and the Fundamental Research Funds for the Central Universities of China (Grant No. FRF-BR-09-007A). |
Corresponding Authors:
Wang Feng-Ping
E-mail: fpwang@ustb.edu.cn
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Cite this article:
Qurat-ul-ain Javed, Wang Feng-Ping, M. Yasir Rafique, Arbab Mohammad toufiq, M. Zubair Iqbal Canted antiferromagnetic and optical properties of nanostructures of Mn2O3 prepared by hydrothermal synthesis 2012 Chin. Phys. B 21 117311
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