Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk


A. Quesada

Institute of Ceramics and Glass (ES)

Ostatnie publikacje
1.  Pedrosa F.J., Rial J., Golasiński K.M., Guzik M.N., Quesada A., Fernández J.F., Deledda S., Camarero J., Bollero A., Towards high performance CoFe2O4 isotropic nanocrystalline powder for permanent magnet applications, APPLIED PHYSICS LETTERS, ISSN: 0003-6951, DOI: 10.1063/1.4969064, Vol.109, No.22, pp.223105-1-4, 2016

We report on a comparative study of high performance isotropic cobalt ferrite (CoFe2O4) powder processed by dry and surfactant assisted (wet) ball milling. Milling times as short as 1.5 min (dry) and 6 min (wet) have resulted in a 4-fold increase in coercivity, with a maximum achieved value above 318 kA/m (4 kOe). The use of surfactant is shown to be advantageous in the formation of a more homogeneous structure constituted by non-agglomerated and strained nanoparticles. A record (BH) max value of 18.6 kJ m −3 (2.34 MGOe) has been obtained for isotropic powder after post-processing annealing. This magnetic performance combined with the required short processing times and the unnecessary requirement of oxygen avoidance in the milling process, makes this CoFe2O4 powder a good candidate for permanent magnet applications.

Słowa kluczowe:
Milling, Nanopowders, Powders, Coercive force, Surfactants

Afiliacje autorów:
Pedrosa F.J. - IMDEA Nanoscience (ES)
Rial J. - IMDEA Nanoscience (ES)
Golasiński K.M. - inna afiliacja
Guzik M.N. - Institute for Energy Technology (NO)
Quesada A. - Institute of Ceramics and Glass (ES)
Fernández J.F. - Instituto de Ceramica y Vidrio (ES)
Deledda S. - Institute for Energy Technology (NO)
Camarero J. - IMDEA Nanoscience (ES)
Bollero A. - IMDEA Nanoscience (ES)

Kategoria A Plus


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