Synthesis, morphology and microstructure of pomegranate-like hematite (α-Fe2O3) superstructure with high coercivity
作者： Marin Tadic , Nada Citakovic , Matjaz Panjan , Boban Stanojevic , Dragana Markovic
DOI: 10.1016/J.JALLCOM.2012.07.047
关键词:
摘要: Abstract We found novel and superior magnetic properties of the hematite (α-Fe 2 O 3 ) that originate from an internal microstructure particles strong inter-particle interactions between nanocrystal sub-units. The were synthesized by thermal decomposition iron (III) nitrate without any template or surfactant. purity, size, crystallinity, morphology, features as-prepared characterized X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive spectroscopy (EDX), transmission microscopy (TEM), high resolution (HRTEM), Raman (RS) SQUID magnetometry. An XRD study reveals a pure phase α-Fe whereas TEM shows spheres with diameter about 150 nm. RS also quality purity sample. Moreover, HRTEM images show pomegranate-like superstructure evidence spherical are composed individual well-crystallized nanoparticle sub-units (self-assembled nanoparticles) size 20 nm. Magnetic measurements display hysteretic behavior at room temperature remanent magnetization M r = 0.731 emu/g, saturation S = 6.83 emu/g coercivity H C = 4350 Oe, as well Morin transition T = 261 K. These results comparison those in literature reveal sample has extremely coercivity. discussed relation to microstructure, surface effects exchange dipole–dipole interactions.
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