Effect of Annealing Temperature on the Structural and Magnetic Properties of Co-Doped TiO2 Nanoparticles via Complex-Polymer Sol–Gel Method
Abstract:Co-doped TiO2 nanoparticles were synthesized via non hydrous complex-polymer sol–gel method. A series of Co x :Ti1−x O2 samples with x = 0.01, 0.03, 0.05, 0.08 and 0.10, were prepared and subsequently annealed at 400°, 600° and 800 °C. Structural and magnetic properties of Co x :Ti1−x O2 have been studied by means of X-ray diffraction and DC magnetometry. All samples annealed at 400 °C show a paramagnetic behavior with an average grain size of 11 nm. With increasing annealing temperatures a complete crystallization is seen with growth of the cluster size up to 31 nm with clear evidence of a presence of CoTiO3. For all concentrations and annealing conditions no sign of a metallic phase, even at x = 0.10, is seen.
Document Type: Research Article
Publication date: 2012-02-01
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