Effect of Ru3+ ions on the formation, structural, magnetic and optical properties of hematite (?-Fe2O3) nanorods

• Ru-doped hematite nanorods were prepared by precipitation and calcination. Ru-for-Fe substitution (up to 2 mol%) induced a gradual elongation of nanorods. Temperature the Morin transition gradually rose with increased Ru doping. Optical band gap narrowed Cylinder-shaped particles formed in presence 4 or 5 mol% Ru. Nanosized (?-Fe O 3 ) is widely investigated material due its favourable properties (chemically stable, environmentally safe, inexpensive) very good performance several advanced applications. Properties nanoparticles can be adjusted improved modification particle size shape, as well Fe 3+ ions crystal structure other metal ions. are potentially suitable for because same charge similar ionic radii. In present work, effects on formation combination hydrothermal calcination investigated. The influence molar fraction system iron oxide phases was studied. Single-phase goethite (?-FeOOH) containing incorporated low levels (<3 mol%), while at higher (4 Ru) nanocylinders, consisting self-assembled fused nanoparticles, obtained. mechanism these nanostructures explained compared effect cations reported literature. after 500 °C. A doping highly elongated nanoneedles observed explained. level magnetic using Mössbauer spectroscopy measurements. between antiferromagnetic (AFM) weakly ferromagnetic (WFM) spin ordering state (Morin transition) increasing -for-Fe hematite. Besides, magnetization WFM decreased which attributed reduced canting two almost antiparallel sublattices this phase. optical found get narrower modified electronic structure.