Morphology evolution of α-Fe2O3controlled via incorporation of alkaline earth metal ions

摘要: Hematite (α-Fe2O3) crystals with different morphologies were successfully fabricated via an environmental friendly hydrothermal route by applying alkaline earth metal ions along the row from Mg2+ to Ba2+ as structure-directing agents without employing any surfactants or templates. It was found that ionic radii mismatch degree between and Fe3+ played a vital role in determining crystalline phase morphology of iron oxide. Pure α-Fe2O3 created Mg2+, Ca2+ Sr2+ (30.9%, 81.8% 114.5% Fe3+) additives while goethite oxide nanoparticles obtained (145.5% radius additives. ion-induced had quasi-cube structure rough surface Ca2+-induced very smooth surface, edge length which is much smaller than ion-controlled crystals. However, when introduced into reaction system, product tended have plate-like structures. The effects on crystal growth rate final through anisotropic incorporation proposed this paper. Moreover, magnetic properties investigated.