Powder samples of TiO₂:A, where A is Mn, V, Co and La, with dopant concentrations of 0.2%, 0.6%, 1.0%, 5.0%, and 9.0%, were prepared by hydrothermal technique and annealed at temperatures ranging from 450°C to 850°C. The crystalline structure and phase of the samples were investigated by XRD, Raman scattering and SEM. The magnetic properties were studied by measuring the magnetization loops at room temperature. The structure and lattice parameters are found to depend on the dopant and annealing temperature. All doped samples exhibited ferromagnetism. A comparison between the doped samples with different elements was carried out in order to contribute to the understanding of the ferromagnetic mechanism. © 2009 IOP Publishing Ltd.

Hai N.N., Khoi N.T., Vinh P.V.

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