Partner: Bjørn Hauback

Institute for Energy Technology (NO)

Recent publications
1.Guzik M.N., Golasiński K.M., Pedrosa F.J., Jenuš P., Bollero A., Hauback B.C., Deledda S., Influence of ultra-short cryomilling on the microstructural andmagnetic properties of cobalt ferrite, JOURNAL OF ALLOYS AND COMPOUNDS, ISSN: 0925-8388, DOI: 10.1016/j.jallcom.2017.05.290, Vol.721, pp.440-448, 2017
Abstract:

The impact of ultra-short milling at liquid nitrogen temperatures on structural and magnetic properties of cobalt ferrite (CoFe2O4) powders has been explored for the first time. Cryomilling for only up to 9 min increases the coercivity of the isotropic powder from 139 to 306 kA/m (1.74–3.85 kOe) and results in its modifications comparable with milling for hours at room temperature. A thermal treatment of processed CoFe2O4 enables further optimization of powder magnetic properties and leads to a high value of energy product (13.5 kJ/m3) for the sample treated at 600 °C. Systematic studies, comprising analysis of structural and microstructural properties, based on synchrotron powder X-ray diffraction, scanning and transmission electron microscopy demonstrate the high efficiency of cryomilling in reduction of crystallite sizes and formation of lattice strain in the processed cobalt ferrite samples.

Keywords:

Cryomilling, Cobalt ferrite, Magnetic properties

Affiliations:
Guzik M.N.-Institute for Energy Technology (NO)
Golasiński K.M.-other affiliation
Pedrosa F.J.-IMDEA Nanoscience (ES)
Jenuš P.-Jožef Stefan Institute (SI)
Bollero A.-IMDEA Nanoscience (ES)
Hauback B.C.-Institute for Energy Technology (NO)
Deledda S.-Institute for Energy Technology (NO)