Structural and Magnetic Properties of Fe3O4 Doped Zirconia

Abstract

ZrO2 is one of the most well studied ceramic materials in biological field because of the excellent mechanical properties (strength and high fracture toughness, hardness) and biocompatibility. In this study magnetite (Fe3O4) has been added into zirconia to stabilize it at room temperature. Different samples were prepared by varying iron oxide (Fe3O4) concentrations by 0-10wt%. Sols of Fe3O4 doped ZrO2 were spun on glass substrate at 3000rpm for 30seconds and annealed at 300°C for 1h. X-ray diffraction results confirm the formation of single phase ZrO2 for 8 and 10wt% of Fe3O4. However, low intensity peak of Fe3O4 along with pure phase of tetragonal zirconia is observed for 10 wt% of Fe3O4 concentration. Effect of reaction temperature (100 to 250°C) on Fe3O4 doped zirconia has also been studied for 6wt% of Fe3O4. X-ray diffraction results describe the formation of mixed phases at relatively low reaction temperature (100°C), whereas with the increase in reaction temperature pure tetragonal zirconia (t-ZrO2) content increases. Relatively lower dislocation lines/m2 has been observed at 200°C reaction temperature along with pure tetragonal zirconia phase. Ferromagnetic behavior has been observed in Fe3O4 doped zirconia with low value of coercivity (∼245Oe) for all dopant concentrations. M-H curves reveal the formation of ferromagnetic behavior with low value of coercivity at temperature of 100 and 200°C.