Preparation of fine Mg1−XCaXFe2O4 powder using reverse coprecipitation method for thermal coagulation therapy in an ac magnetic field

摘要: Abstract New magnetic materials having a potentially high heat generation ability in an ac field were studied for application thermal coagulation therapy. The Mg 1− X Ca Fe 2 O 4 ferrites with varied from 0 to 1.0 synthesized using reverse coprecipitation method. obtained precursors calcined at various temperatures the range of 300–1000 °C intent obtain fine ferrite powders. was very poor  = 0. However, improved partial 2+ substitution sites. maximum rise temperature (Δ T ) (370 kHz, 1.77 kA/m) ca. 50 °C samples 1.0 g weight and 0.2–0.8 . Especially, 800 °C showed highest generation. When -substituted 900 °C, reduced due decomposition into two phases MgFe -type cubic CaFe orthorhombic. In addition, 300 °C also Although crystal particle sizes increased calcination temperature, they did not influence this system. closely related hysteresis loss. reason properties 300 is ascribed increase loss by distortion structure.