29 KB560 KB26 KB200020242012Celik, ErdalGurbuz, AylinKaraoglanli, Abdullah CahitOnar, NurhanOzdemir, Ismailštevilka:3letnik:46str. 305-310ISSN:1580-2949COBISSID:935338URN:URN:NBN:SI:doc-F6CV4NCUenInštitut za kovinske materiale in tehnologijeMateriali in tehnologijebarijev feritbarium ferritesol-geltermična analizathermal analysisStructural, thermal and magnetic properties of barium-ferrite powders substituted with Mn, Cu or Co and X (X = Sr and Ni) prepared by the sol-gel method| Strukturne, termične in magnetne lastnosti prahov barijevega ferita, nadomeščenih z Mn, Cu ali Co in X (X = Sr in Ni), pripravljenih po sol-gel metodi|In this study, Ferrite A (undoped barium hexaferrite), Ferrite B (MnCuNi-dopedbarium hexaferrite), Ferrite C (MnCuSr-doped barium hexaferrite),Ferrite D (MnCoNi-doped barium hexaferrite) and Ferrite E (MnCoSr-doped barium hexaferrite) powders were prepared by sol-gel processing. The produced powders were calcined at 550 °C for 6 h and sintered at 1000 °C for 5 h to obtain the required phases. The powders were characterized by differential thermal analysis/thermogravimetric analysis (DTA/TG), X-ray diffractometry (XRD) and scanning electron microscopy (SEM), and vibrating-sample magnetometry (VSM). The XRD patterns indicated that the pure barium ferrite phase was not obtained. The presence of M-type BaFe11.6Mn0.4O19 was confirmed in the Ferrite B and Ferrite D patterns. In the Ferrite C pattern, there were the phases of BaFe12O19, Ba2Cu2Fe12O22 (X or Z-type) and Sr3Fe2O6.16. The Ba0.5Sr0.5Fe12 phase was easily observed in the Ferrite E pattern. The results showed that the dopant materials significantly change the particle shape of Ferrite A powders, but also lower the value of the coercivity. A higher saturation magnetization was observed for the Ferrite D powderV tej raziskavi so prahovi ferita A (nedopiran barijev heksaferit), ferita B (MnCuNi, dopiran barijev heksaferit), ferita C (MnCuSr, dopiran barijev heksaferit), ferita D (MnCoNI, dopiran barijev heksaferit) in ferita E (MnCoSr, dopiran barijev heksaferit) pripravljeni po sol-gel metodi. Prahovi so bili kalcinirani pri 550 °C 6 ur in sintrani pri 1000 °C 5 ur, da so nastale zahtevane faze. Prahovi so bili karakterizirani z diferenčno termično analizo/termogravimetrijsko analizo (DTA/TG), difraktometrijo rentgenskih žarkov (XRD), z vrstičnim elektronskim mikroskopom in z vibracijskih magnetometrom (VSM). XRD-spektri so pokazali, da ni bila dosežena faza čisti barijev ferit. Prisotnost M-tipa BaFe11,6Mn0,4O19 je bila potrjena v feritih Bin D. V feritu C so bile tudi faze BaFe12O19, Ba2Cu2Fe12O22 (tip X ali Z) in Sr3Fe2O6,16. Faza Ba0,5Sr0,5Fe12 je bila opažena v feritu E. Rezultati so pokazali, da dopanti pomebno spremenijo obliko prahov ferita A in znižajo koercitivnost. Višja magnetna nasičenost je bila opažena pri prahu ferita DTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije