Effect of temperature and time on properties of Spark Plasma Sintered NiCuZn: Co ferrite

Karim Zehani (1) , Frederic Mazaleyrat (2) , Vincent Loyau (2) , Eric Labouré (3)

1 SATIE - Systèmes et Applications des Technologies de l'Information et de l'Energie
2 SATIE-MME - Matériaux Magnétiques pour l'Energie
3 LGEP - Laboratoire de génie électrique de Paris

Spark Plasma Sintering is a powerfal method to produce fine grain dense ferrite at low temperature. However, the process, usually conducted in neutral atmosphere in a carbon die, yields carbon surface deposition and reduction of Fe3+ into Fe2+. It's shown that subsequent annealing in air can remove carbon and, under some conditions, produce complete oxidation of Fe2+ ions. Regular values of the resistivity and permittivity (resp. 1 M­m, 13 "0) are recovered for most samples annealed not higher than 750±C. Relatively high value of the permeability (up to 240) and high merit factor (μs × fr > 5 GHz) have been achieved.

Mots clés: Spark Plasma Sintering; Spinel ferrite; Grain size; Complex real permittivity; Complex initial permeability

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Karim Zehani, Frederic Mazaleyrat, Vincent Loyau, Eric Labouré. Effect of temperature and time on properties of Spark Plasma Sintered NiCuZn: Co ferrite. Journal of Applied Physics, 2011, 109, pp.07A504. ⟨10.1063/1.3561444⟩. ⟨hal-00608882⟩