Synthesis of novel self-regulated hyperthermia materials and investigation of their properties

In this study, nano-sized perovskites LaMnO3, LaFeO3, LaCoO3, Curie temperature and magnetic properties of which are determined to be suitable for self-controlled hyperthermia, were produced by sol-gel method. X-ray Powder Diffraction (XRD) method and Thermogravimetric Analysis (TG) were used for structural analysis, X-ray Photoelectron Spectroscopy (XPS) was used for determination of the composition, topographic analysis was made by Scanning Electron Microscopy (SEM), magnetic properties were analyzed by Vibrating Sample Magnetometer (VSM), and magneto-thermal behavior of the samples was characterized by Alternating Magnetic Field (ACMF) hyperthermia system. As a result of the characterization of the samples, it was observed that the interesting results relevant to negative magnetization and exchange-bias arises from the thermal process. It was observed that the Curie temperature of the LaCo0,5Fe0,5O3 material, for which no auto-control hyperthermia study was performed before, was brought down to 370 K by Co doping, but the magnetization was not at the desired level (~1 emu/g). In the last stage of the study, it was determined for the first time in the literature that La1-xSrxMnO3 material is a suitable material candidate for auto control hyperthermia in terms of both magnetization (5-20 emu/g) and Curie temperature range (287-357 K), and its hyperthermia properties were investigated.