Instytut Podstawowych Problemów Techniki
Polskiej Akademii Nauk

Partnerzy

J. Camarero

IMDEA Nanoscience (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

Streszczenie:
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)
35p.
2.  Pedrosa F.J., Rial J., Golasiński K.M., Rodriguez Osorio M., Salas G., Granados D., Camarero J., Bollero A., Tunable nanocrystalline CoFe2O4 isotropic powders obtained by co-precipitation and ultrafast ball milling for permanent magnet applications, RSC Advances, ISSN: 2046-2069, Vol.6, pp.87282-87287, 2016

Streszczenie:
Synthesis of nanocrystalline Co-ferrite powders with tunable magnetic properties is demonstrated by using co-precipitation and a novel ultrafast milling route. Milling times as short as a few minutes are re- ported for the first time to be sufficient to refine microstructure and to induce microstrain, and act efficiently, providing a 5-fold increase in coercivity. This is achieved with no compositional change during processing, but exclusively through microstructural modification. The efficiency of this process and its feasible scalability pave the way for development of Co-ferrite powders for permanent magnet applications.

Afiliacje autorów:
Pedrosa F.J. - IMDEA Nanoscience (ES)
Rial J. - IMDEA Nanoscience (ES)
Golasiński K.M. - inna afiliacja
Rodriguez Osorio M. - IMDEA Nanoscience (ES)
Salas G. - Campus Universidad Autònoma de Madrid (ES)
Granados D. - IMDEA Nanoscience (ES)
Camarero J. - IMDEA Nanoscience (ES)
Bollero A. - IMDEA Nanoscience (ES)
30p.

Kategoria A Plus

IPPT PAN

logo ippt            ul. Pawińskiego 5B, 02-106 Warszawa
  +48 22 826 12 81 (centrala)
  +48 22 826 98 15
 

Znajdź nas

mapka
© Instytut Podstawowych Problemów Techniki Polskiej Akademii Nauk 2021