Mg_(1-X)Cu_XFe_2O_4 type spinel ferrite was prepared by solid reaction method in order to discuss the heat generation ability in AC magnetic field.The cubic type ferrite structure was obtained for X=0-0.6 samples calc...Mg_(1-X)Cu_XFe_2O_4 type spinel ferrite was prepared by solid reaction method in order to discuss the heat generation ability in AC magnetic field.The cubic type ferrite structure was obtained for X=0-0.6 samples calcined at 1200℃,and the mixture phase of cubic and tetragonal structures were obtained for X=0.7,0.8 samples from XRD result. The highest lattice parameter and highest hysteresis loss value were also shown at X=0.6 sample,the crystal distortion was increased with increase the Cu^(2+)substitution in cubic type ferrite structure.The sized nano Mg_(0.4)Cu_(0.6)Fe_2O_4 powder was prepared by physical milling method using beads milling.The highest heat generation in the AC magnetic field was obtained for the 6 h milled samples using 0.1mm beads.The Cu^(2+)substitution for MgFe_2O_4 ferrite and the beads milling were very effective for the improvement of their heat generation ability in AC magnetic field.展开更多
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 ...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(flkHz)and the magnetic field(H/kA·m^(-1)))for the Y_3Fe_5O_(12)sample calcined at 1100 ℃.展开更多
基金Item Sponsored by Grants-in-Aid from Ministry of EducationScience and Culture of Japan (No.23760645)
文摘Mg_(1-X)Cu_XFe_2O_4 type spinel ferrite was prepared by solid reaction method in order to discuss the heat generation ability in AC magnetic field.The cubic type ferrite structure was obtained for X=0-0.6 samples calcined at 1200℃,and the mixture phase of cubic and tetragonal structures were obtained for X=0.7,0.8 samples from XRD result. The highest lattice parameter and highest hysteresis loss value were also shown at X=0.6 sample,the crystal distortion was increased with increase the Cu^(2+)substitution in cubic type ferrite structure.The sized nano Mg_(0.4)Cu_(0.6)Fe_2O_4 powder was prepared by physical milling method using beads milling.The highest heat generation in the AC magnetic field was obtained for the 6 h milled samples using 0.1mm beads.The Cu^(2+)substitution for MgFe_2O_4 ferrite and the beads milling were very effective for the improvement of their heat generation ability in AC magnetic field.
文摘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(flkHz)and the magnetic field(H/kA·m^(-1)))for the Y_3Fe_5O_(12)sample calcined at 1100 ℃.
