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R_3Fe_5O_(12)(R=Y,Sm,Gd,Dy,Ho,Er)powders synthesized by a reverse coprecipitation method were investigated for their heat generation ability in an AC magnetic field.The heat generation ability in an AC magnetic field was strongly influenced by the particle size,i.e.,calcination temperature of the precursor.The highest heat generation ability was obtained for the Y_3Fe_5O_(12)sample calcined at 1100℃.The heat generation ability(W.g~(-1))can be estimated using a 3.6×10~(-4)fH~3(frequency(f/kHz)and the magnetic field(H/kA·m~(-1)))for the Y_3Fe_5O_(12)sample calcined at 1100℃.
R_3Fe_5O_ (12) (R = Y, Sm, Gd, Dy, Ho, Er) powders synthesized by a reverse coprecipitation method were investigated for their heat generation ability in an AC magnetic field. Heat generation ability in an AC magnetic field was strongly influenced by the particle size, ie, calcination temperature of the precursor. highest heatgeneration ability was obtained for Y_3Fe_5O_ (12) sample calcined at 1100 ℃ .the heatgeneration ability (Wg -1) can be estimated using a 3.6 × 10 ~ (-4) fH ~ 3 (frequency (f / kHz) and the magnetic field (H / kA · m -1)) for the Y_3Fe_5O_ (12) sample calcined at 1100 ℃.