초음파 습식 자기분류법을 이용한 MgxNiyZn1-x-yFe2O4 나노입자 제조
Preparation of Nano-sized MgxNiyZn1-x-yFe2O4 by Ultrasonic Wet-Magnetic Separation Method
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초록
MgxNiyZn1-x-yFe2O4 ferrite powders were prepared by self-propagating high temperature synthesis followed by classifying with an ultrasonic wet-magnetic separation unit to get high pure nano-sized particles. The MgxNiyZn1-x-yFe2O4 ferrites were well formed by using several powders like iron, nickel oxide, zinc oxide and magnesium oxide at 0.1 MPa of oxygen pressure. The ultrasonic wet-magnetic separation of pre-mechanical milled ferrite powders resulted in producing the powders with average size of 800 nm. The addition of a surfactant during the wet-magnetic separation process improved productivity more than twice. The coercive force, maximum magnetization and residual magnetization of the MgxNiyZn1-x-yFe2O4 nano-powders with 800 nm size were 3651 A/m, 53.92 Am2/kg and 4.0 Am2/kg, respectively.
Abstract
MgxNiyZn1-x-yFe2O4 ferrite powders were prepared by self-propagating high temperature synthesis followed by classifying with an ultrasonic wet-magnetic separation unit to get high pure nano-sized particles. The MgxNiyZn1-x-yFe2O4 ferrites were well formed by using several powders like iron, nickel oxide, zinc oxide and magnesium oxide at 0.1 MPa of oxygen pressure. The ultrasonic wet-magnetic separation of pre-mechanical milled ferrite powders resulted in producing the powders with average size of 800 nm. The addition of a surfactant during the wet-magnetic separation process improved productivity more than twice. The coercive force, maximum magnetization and residual magnetization of the MgxNiyZn1-x-yFe2O4 nano-powders with 800 nm size were 3651 A/m, 53.92 Am2/kg and 4.0 Am2/kg, respectively.
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