Preparation of Al-substituted Ni ferrite powders via mechanochemical processing

Abstract

Single-phase NiAlFeO4 fine particles were prepared via high-energy ball milling (HEBM) and subsequent heat treatments. X-ray diffraction (XRD) of the as-milled powder indicates that a dominant spinel phase forms after 60h of milling. A complete single phase of NiAlFeO4 was formed by subsequent heat treatments of the as-milled powder at 950 °C, which is lower than the temperature associated with the conventional ceramic technique. XRD, EDS, DTG/M/ and magnetic observations were used to discuss mechanism of the ferrite formation by HEBM and subsequent heat treatments. © 2002 Elsevier Science B.V. All rights reserved.