Structural and Magnetic Property of Cr3+ Substituted Cobalt Ferrite Nanomaterials Prepared by the Sol-Gel Method.
Jinpei LinJiaqi ZhangHao SunQing LinZeping GuoHu YangYun HePublished in: Materials (Basel, Switzerland) (2018)
Cobalt-chromium ferrite, CoCrxFe2-xO₄ (x = 0⁻1.2), has been synthesized by the sol-gel auto-combustion method. X-ray diffraction (XRD) indicates that samples calcined at 800 °C for 3 h were a single-cubic phase. The lattice parameter decreased with increasing Cr concentration. Scanning electron microscopy (SEM) confirmed that the sample powders were nanoparticles. It was confirmed from the room temperature Mössbauer spectra that transition from the ferrimagnetic state to the superparamagnetic state occurred with the doping of chromium. Both the saturation magnetization and the coercivity decreased with the chromium doping. With a higher annealing temperature, the saturation magnetization increased and the coercivity increased initially and then decreased for CoCr0.2Fe1.8O₄.
Keyphrases
- electron microscopy
- room temperature
- ionic liquid
- reduced graphene oxide
- carbon nanotubes
- molecular docking
- high resolution
- wound healing
- computed tomography
- density functional theory
- particulate matter
- iron oxide nanoparticles
- risk assessment
- magnetic resonance
- gold nanoparticles
- mass spectrometry
- magnetic resonance imaging
- molecularly imprinted
- molecular dynamics
- molecular dynamics simulations
- dual energy
- sewage sludge