Magnetic interactions in ball-milled spinel ferrites

Lithium insertion in ball-milled graphite

The effects of mechanical milling on the microstructure, morphology and electrochemical performance of graphite powders with respect to lithium insertion are studied. After 150 h of ball-milling, the well-graphitized graphite has been pulverized into small particles with a size of about 50 nm, in which there are a lot of excess vacancies, microcavities and metastable carbon interstitial phases ...

Mixed-Valence Defect Ferrites : a New Family of Fine Powders and Thin Films of Spinel Ferrites

When highly divided spinel fenites become reactive enough with oxygen, to allow the oxidation of the Fe ions at low temperature and of substitute cations too, when these cations are capable of different valence states. We prepared fine particles of spinel ferrites substituted by Mn, Mo, Cu, by "chimie douce", especially from oxalate precursors and used them to reveal and to study the oxido-redu...

Coercivity and squareness enhancement in ball-milled hard magnetic–antiferromagnetic composites

Identification of a High Temperature Magnetic Phase Transition in Ball-milled Nanocrystalline Fe-cu Alloys

Fe -Cu alloys (40≤x≤90) prepared by ball milling nominally pure (99%) Fe and Cu powders and warm x 100-x compacted (at ∼300 °C) were investigated by differential scanning calorimetry, scanning electron microscopy, x-ray diffraction, and magnetic susceptibility measurements. Both FCC and BCC diffraction peaks (indicative of pure Fe and Cu) showed that the mixtures were still two phase even after...

Comment on ‘‘Grain-boundary structure and magnetic behavior in nanocrystalline ball-milled iron’’

Del Bianco, Hernando, Bonetti, and Navarro @Phys. Rev. B 56, 8894 ~1997!# published Mössbauer spectroscopy and magnetization measurements on ball-milled iron. The observed changes were attributed to the increased grain-boundary fraction and this was supported by measurements on heat treated samples. The recovery of the physical properties of bulk iron after the heat treatments was attributed to...