New heat generation material in AC magnetic field for Y_3Fe_5_O(12)-based powder material synthesized by reverse coprecipitation method

摘要

We found the most promising powder material for the application of the thermal coagulation therapy for the treatment of cancerous tissues. The maximum heat generation ability (AT = 40-77℃ , 370 kHz, 1.77 kA·m~(-1)) was obtained for the powder materials by the calcination at 1100 ℃ for the Y_(3 _ x)GdxFe_5O_(12) system. This AT value is higher than ca. △T = 30℃in same magnetic field for fine FeFe_2O_4 particles as the candidate material for this type of therapy. The particle growth with the formation of the cubic single phase might influence to the high heat generation. As an unexpected result, the Gd_3Fe_5O (12) (X = 3) has no heat generation ability in an AC magnetic field.