Structure and magnetic properties of nano-sized HoFe2O4 material. (26th August 2010)

• Record Type: Journal Article
• Authors: Jaafar, A.; Al-Saie, A.; Bououdina, M.
• Is Part Of: International journal of nanoparticles. Volume 3:Number 2(2010)
• Page Start: 173
• Page End: 178
• Publication Date: 2010-08-26
• Subjects: spinel ferrite -- holmium -- mechanical alloying -- nanoparticles -- magnetic properties -- X-ray diffraction -- nanocrystals -- nanotechnology -- annealing -- nanostructure; Nanotechnology -- Periodicals; 620.505
• Languages: English
• ISSNs: 1753-2507

Abstract

A mixture of Ho2O3 and Fe2O3 were mechanically alloyed followed by subsequent annealing to produce a single nanocrystalline HoFe2O4 phase. XRD patterns and magnetisation hysteresis curves were obtained for both the as-milled and annealed samples. XRD analysis indicates the formation of an initial amorphous phase in the as-milled powder. After annealing up to 1200°C, the material crystallises into nanosized (75 nm) monoferrite HoFe2O4 phase, accompanied by dramatic increment of magnetic properties. Moreover, the HoFe2O4 shows a ferromagnetic behaviour and a large hysteresis loop with Ms ≈ 72 emu/g, Hc ≈ 1.4 kOe and Mr ≈ 39 emu/g.