Ferk, Gregor, 1976- ; Ban, Irena ; Drofenik, Mihael
V raziskovalnem delu smo želeli s spreminjanjem reakcijskih parametrov (množina Fe3+ v reakcijski raztopini, razmerje [OH-]:[NO3] ionov, čas in temperatura sinteze) hidrotermalne sinteze doseči čim ...manjšo velikost nanodelcev barijevega ferita (BaFe12O19). Za kvalitativno karakterizacijo vzorcev in ocenitev velikosti nanodelcev smo uporabili rentgentsko praškovno difrakcijo (XRD). Morfologijo nanodelcev smo preučevali s pomočjo transmisijskega elektronskega mikroskopa (TEM). Magnetne meritve so bile izvedene s SQUID magnetometrom. Rezultati so pokazali, da z zelo visokim razmerjem [OH-]:[NO3] ionov (16:1) lahko pri nizki temperaturi in kratkem času sinteze sintetiziramo nanodelce povprečne velikosti pod 10 nm. Magnetne meritve so pokazale, da imajo ti nanodelci superparamagnetne lastnosti, katerih temperatura prehoda med superparamagnetno in paramagnetno fazo znaša TB = 193 K. Ploščice BaFe12O19 imajo povprečno velikost 8,7nm in debelino 3,3 nm (kar je 1,4 celične konstante c).
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