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Effect of annealing temperature on magnetic properties of pure TiO2 nanoparticles

JIANGUO ZHAO1,2,* , AKE ZHAO1,2, WEIYING ZHANG1,2, MAO YANG1,2, ZHAOJUN LIU1,2

Affiliation

  1. School of Physics and Electronic Information, Luoyang Normal College, Henan, Luoyang 471022 , PR China
  2. Luoyang Key Laboratory of Laser Spectroscopy Technology, Henan, Luoyang 471022, PR China

Abstract

We report the magnetism of pure TiO2 nanoparticles, which were prepared by sol-gel method with the postannealing in air at different temperatures without any ferromagnetic dopant. The results of X-ray diffraction and Raman spectra show that the samples change from anatase phase to rutile phase with the increasing of annealing temperatures from 450 °C to 800 °C. Magnetization measurement indicates that the TiO2 nanoparticles annealed at 450, and 550 °C exhibit the weak ferromagnetism at 5 K, and at 800 °C exhibit the diamagnetism which is due to the decreasing surface defects with the increasing of annealing temperature. In addition, the mechanism of magnetic transition measured at different temperature is also discussed..

Keywords

TiO2, Magnetism, Defect, Sol-gel.

Citation

JIANGUO ZHAO, AKE ZHAO, WEIYING ZHANG, MAO YANG, ZHAOJUN LIU, Effect of annealing temperature on magnetic properties of pure TiO2 nanoparticles, Optoelectronics and Advanced Materials - Rapid Communications, 7, 5-6, May-June 2013, pp.393-396 (2013).

Submitted at: Sept. 15, 2012

Accepted at: June 12, 2013