The magnetodielectric effect in BaTiO3-SrFe12O19 nanocomposites
2014 (English)In: Journal of Materials Chemistry C: Materials for Optical and Electronic Devices, ISSN 2050-7526, Vol. 2, no 2, 325-330 p.Article in journal (Refereed) Published
A nanoscale composite consisting of 30 vol% magnetic strontium hexaferrite SrFe12O19 embedded in a high dielectric permittivity matrix of BaTiO3 has been produced by the spark plasma sintering method. The morphology and phase composition were characterized by transmission electron microscopy (TEM) and powder X-ray diffraction (XRD) techniques. TEM micrographs indicate that no considerable grain growth occurs and different strained regions were formed by the sintering process. XRD investigations show no evidence of a chemical reaction between the constituents. The dielectric properties of such a nanocomposite were investigated versus temperature (50-300 K), frequency (100 Hz to 100 kHz) and magnetic field (0-5.6 Tesla). A magnetodielectric (MD) effect was detected in the whole studied temperature range. Above 150 K the occurrence of sharp magnetodielectric resonances around 1 kHz leads to a considerable enhancement of the effect. At temperatures below 150 K a positive MD effect was detected which is independent of the frequency.
Place, publisher, year, edition, pages
2014. Vol. 2, no 2, 325-330 p.
IdentifiersURN: urn:nbn:se:su:diva-100097DOI: 10.1039/c3tc31737dISI: 000329068000014OAI: oai:DiVA.org:su-100097DiVA: diva2:692342