title: Magnetic properties of ball-milled SrFe12O19 particles consolidated by Spark-Plasma Sintering.
abstract: The room-temperature magnetic properties of ball-milled strontium hexaferrite particles consolidated by spark-plasma sintering are strongly influenced by the milling time. Scanning electron microscopy revealed the ball-milled SrFe12O19 particles to have sizes varying over several hundred nanometers. X-Ray powder-diffraction studies performed on the ball-milled particles before sintering clearly demonstrate the occurrence of a pronounced amorphization process. During sintering at 950 °C, re-crystallization takes place, even for short sintering times of only 2 minutes and transformation of the amorphous phase into a secondary phase is unavoidable. The concentration of this secondary phase increases with increasing ball-milling time. The remanence and maximum magnetization values at 1T are weakly influenced, while the coercivity drops dramatically from 2340 Oe to 1100 Oe for the consolidated sample containing the largest amount of secondary phase.
authors.affiliation: Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus C, Denmark.
authors.forename: Marian
authors.initials: M
authors.lastname: Stingaciu
authors.affiliation: Department for Nanostructured Materials, Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia.
authors.forename: Martin
authors.initials: M
authors.lastname: Topole
authors.affiliation: Department for Nanostructured Materials, Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia.
authors.forename: Paul
authors.initials: P
authors.lastname: McGuiness
authors.affiliation: Center for Materials Crystallography, Department of Chemistry and iNANO, Aarhus University, DK-8000 Aarhus C, Denmark.
authors.forename: Mogens
authors.initials: M
authors.lastname: Christensen