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CoFe2O4-based nano-magnetic composite powder and preparation method thereof
The invention discloses CoFe2O4-based nano-magnetic composite powder and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing nano-cobalt ferrite powder with Y3Fe5O12 powder according to xCoFe2O4/(1-x)Y3Fe5O12, and then calcining for 2-4 hours at 750-830 DEG C to obtain the product, wherein x is the mass percentage of CoFe2O4, and is not less than 60% and not greater than 90%. According to the CoFe2O4-based nano-magnetic composite powder disclosed by the invention, an exchange coupling action can be carried out between the two phases of CoFe2O4 and Y3Fe5O12 at a proper temperature and in a proper grain size, and because the exchange coupling action among the grains of a nano-magnetic material is capable of reducing effective anisotropy and increasing a magnetic dipole moment along a magnetic field direction, residual magnetism can be generated. The magnetic composite powder prepared by the preparation method disclosed by the invention has a residual magnetization intensity of 16.8-28.2emu/g and a saturation magnetization intensity of 48.37-63.02emu/g.
CoFe2O4-based nano-magnetic composite powder and preparation method thereof
The invention discloses CoFe2O4-based nano-magnetic composite powder and a preparation method thereof. The preparation method comprises the following steps: uniformly mixing nano-cobalt ferrite powder with Y3Fe5O12 powder according to xCoFe2O4/(1-x)Y3Fe5O12, and then calcining for 2-4 hours at 750-830 DEG C to obtain the product, wherein x is the mass percentage of CoFe2O4, and is not less than 60% and not greater than 90%. According to the CoFe2O4-based nano-magnetic composite powder disclosed by the invention, an exchange coupling action can be carried out between the two phases of CoFe2O4 and Y3Fe5O12 at a proper temperature and in a proper grain size, and because the exchange coupling action among the grains of a nano-magnetic material is capable of reducing effective anisotropy and increasing a magnetic dipole moment along a magnetic field direction, residual magnetism can be generated. The magnetic composite powder prepared by the preparation method disclosed by the invention has a residual magnetization intensity of 16.8-28.2emu/g and a saturation magnetization intensity of 48.37-63.02emu/g.
CoFe2O4-based nano-magnetic composite powder and preparation method thereof
YANG HAIBO (author) / YE TING (author) / LIN YING (author) / ZHU JIANFENG (author) / WANG FEN (author)
2015-04-29
Patent
Electronic Resource
English
IPC:
C04B
Kalk
,
LIME
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