TY - JOUR
T1 - Mechanosynthesis, crystal structure and magnetic characterization of M-type SrFe12O19
AU - Sánchez-De Jesús, F.
AU - Bolarín-Miró, A. M.
AU - Cortés-Escobedo, C. A.
AU - Valenzuela, R.
AU - Ammar, S.
N1 - Funding Information:
This project was financially assisted by the National Science and Technology Council of Mexico, CONACyT , under Grant nos. 130413 and 139292 (ANR-CONACyT).
PY - 2014/4
Y1 - 2014/4
N2 - M-type strontium hexaferrite was prepared by mechanosynthesis using high-energy ball milling. The influence of milling parameters, hematite excess and annealing temperature on magnetic properties of SrFe12O 19 were investigated. Commercial iron and strontium oxides were used as starting materials. It was found that mechanical milling followed by an annealing treatment at low temperature (700 C) promotes the complete structural transformation to Sr-hexaferrite phase. For samples annealed at temperatures from 700 to 1000 C, saturation magnetization values (Ms) are more sensitive to annealing temperature than coercivity values (Hc). The maximum Ms of 60 emu/g and Hc of 5.2 kOe were obtained in mixtures of powders milled for 5 h and subsequently annealed at 700 C. An increase in the annealing temperature produces negligible changes in magnetic saturation and coercivity. An excess of hematite as a second phase produces a slight decrease in the saturation magnetization but leads to a significant increase in coercive field, reaching 6.6 kOe.
AB - M-type strontium hexaferrite was prepared by mechanosynthesis using high-energy ball milling. The influence of milling parameters, hematite excess and annealing temperature on magnetic properties of SrFe12O 19 were investigated. Commercial iron and strontium oxides were used as starting materials. It was found that mechanical milling followed by an annealing treatment at low temperature (700 C) promotes the complete structural transformation to Sr-hexaferrite phase. For samples annealed at temperatures from 700 to 1000 C, saturation magnetization values (Ms) are more sensitive to annealing temperature than coercivity values (Hc). The maximum Ms of 60 emu/g and Hc of 5.2 kOe were obtained in mixtures of powders milled for 5 h and subsequently annealed at 700 C. An increase in the annealing temperature produces negligible changes in magnetic saturation and coercivity. An excess of hematite as a second phase produces a slight decrease in the saturation magnetization but leads to a significant increase in coercive field, reaching 6.6 kOe.
KW - Hexaferrite
KW - Magnetization
KW - Mechanochemical processing
KW - Oxide materials
KW - SrFe O
UR - http://www.scopus.com/inward/record.url?scp=84891372623&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2013.08.056
DO - 10.1016/j.ceramint.2013.08.056
M3 - Artículo
SN - 0272-8842
VL - 40
SP - 4033
EP - 4038
JO - Ceramics International
JF - Ceramics International
IS - 3
ER -