20.500.12556/DKUM-55252 SINTEZA IN KARAKTERIZACIJA Mg-Ti FERITOV DOPIRANIH Z LANTANIDI SYNTHESIS AND CHARACTERIZATION OF Mg-Ti FERRITE DOPED WITH LANTANIDES V magistrskem delu smo preučevali vpliv deleža dopanta gadolinija oziroma disprozija na strukturne in magnetne lastnosti Mg-Ti ferita ter hkrati primerjali dopirane delce z nedopiranimi. Za sintezo spinelnega ferita smo uporabili metodo koprecipitacije, vzorce pa smo nato še dodatno temperaturno obdelali s postopkom kalciniranja. Nastale produkte smo analizirali z rentgensko praškovno difrakcijo (XRD), termogravimetrijo (TGA), z magnetometrom z vibrirajočim vzorcem (VSM) in jim določili Curiejeve temperature z modificirano termogravimetrično aparaturo. Rezultati kažejo, da nam je v vseh primerih uspelo sintetizirati nanodelce spinelnega magnezijevega ferita, katerega kristaliničnost, ocenjena velikost kristalitov in Curiejeva temperatura se je razlikovala glede na delež železa oziroma dopanta, vrsto dopanta in temperaturo kalciniranja. Najprimernejše Curiejeve temperature za uporabo v magnetni hipertermiji je izkazoval nedopirani magnezijev ferit (x=0,34 in 0,37), ki smo ga kalcinirali pri temperaturi od 800 °C do 900 °C ter pri 1000 °C. Med dopiranimi nanodelci bi lahko za magnetno hipertermijo uporabili le delce Mg1,34Fe1,22Gd0,10Ti0,34O4. Pri primerjavi magnetizacije smo ugotovili, da pri procesu dopiranja ferita x=0,37 z 10% deležem gadolinija, magnetna nasičenost naraste iz 6,34 emu/g na 13,25 emu/g. In this master's degree we studied the influence of doping fraction of gadolinium or dysprosium on the structural and magnetic properties of Mg-Ti ferrite and also compared doped particles with undoped ones. The coprecipitation method was used for the synthesis of spinel ferrite and then the particles were heat treated by calcination process. The resulting products were characterized by X-ray powder diffraction (XRD), thermogravimetry (TGA), a vibrating sample magnetometer (VSM) and we determined the Curie temperatures by modified thermogravimetric apparatus. The results show that we have been able to synthesize nanoparticles of magnesium spinel ferrite, whose crystallinity, estimated crystallite size and Curie temperature is different, depending on iron or dopant fraction, dopant type and calcining temperature. The most suitable Curie temperature for magnetic hyperthermia application showed undoped magnesium ferrite (x=0,34 in 0,37), which was calcined at a temperature of 800 °C to 900 °C and 1000 °C. Among the doped nanoparticles, only particles Mg1,34Fe1,22Gd0,10Ti0,34O4 could be used for magnetic hyperthermia. When we compared the magnetization, we found that magnetic saturation increases from 6,34 emu/g to 13,25 emu/g in the process of doping ferrite (x=0,37) with 10% fraction of gadolinium. koprecipitacija magnetni nanodelci spinelni ferit dopiranje z lantanidi Curiejeva temperatura coprecipitation magnetic nanoparticles spinel ferrite lantanide doping Curie temperature true true false [A. Grdjan] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2015-10-12 16:14:12 2015-11-04 13:09:35 2022-06-08 03:11:24 2021-05-14 03:16:50 2015 0 Maribor 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 537.638:549.73(043.2) 19124502 URN:SI:UM:DK:YMCVTO0X MAG_Grdjan_Ales_2015.pdf MAG_Grdjan_Ales_2015.pdf 1 AF6765CB4A23A47D0E2E08110123F3E9 f0c4f3839d86834d5d34727f2df41d9e71787c43954cf0e209ca076fab543a81 3d7f8001-7c07-11eb-bb7a-00155d0001ca https://dk.um.si/Dokument.php?lang=slv&id=82895 Fakulteta za kemijo in kemijsko tehnologijo 0 0 0