Nano Archive

Structure, room-temperature magnetic and optical properties of Mn-doped TiO 2 nano powders prepared by the sol—gel process

Peng, Ding and Fa-Min, Liu and Chuang-Cang, Zhou and Wen-Wu, Zhong and Huan, Zhang and Lu-Gang, Cai and Le-Gui, Zeng (2010) Structure, room-temperature magnetic and optical properties of Mn-doped TiO 2 nano powders prepared by the sol—gel process. Chinese Physics B, 19 (11). p. 118102.

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Official URL: http://stacks.iop.org/1674-1056/19/i=11/a=118102

Abstract

TiO 2 nano powders with Mn concentration of 0 at%-12 at% were synthesized by the sol—gel process, and were annealed at 500 °C and 800 °C in air for 2 hrs. X-ray diffraction (XRD) measurements indicate that the Mn-TiO 2 nano powders with Mn concentration of 1 at% and 2 at% annealed at 500 and 800 °C are of pure anatase and rutile, respectively. The scanning electron microscope (SEM) observations reveal that the crystal grain size increases with the annealing temperature, and the high resolution transmission electron microscopy (HRTEM) investigations further indicate that the samples are well crystallized, confirming that Mn has doped into the TiO 2 crystal lattice effectively. The room temperature ferromagnetism, which could be explained within the scope of the bound magnetic polaron (BMP) theory, is detected in the Mn-TiO 2 samples with Mn concentration of 2 at%, and the magnetization of the powders annealed at 500 °C is stronger than that of the sample treated at 800 °C. The UV—VIS diffuse reflectance spectra results demonstrate that the absorption of the TiO 2 powders could be enlarged by the enhanced trapped electron absorption caused by Mn doping.

Item Type:Article
ID Code:11188
Deposited By:Prof. Alexey Ivanov
Deposited On:01 Nov 2011 23:26
Last Modified:02 Nov 2011 00:47

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