Effect of mechanical milling on the structural, magnetic and dielectric properties of coprecipitated ultrafine zinc ferrite Shenoy, S D; Joy, P A; Anantharaman, M R 36 MATERIALS SCIENCE; COPRECIPITATION; DIELECTRIC PROPERTIES; FERRITES; HEMATITE; IRON OXIDES; MAGNETIC MATERIALS; MAGNETIC PROPERTIES; MILLING; NANOSTRUCTURES; SPINELS; STRAINS; SUPERPARAMAGNETISM; X-RAY DIFFRACTION; ZINC COMPOUNDS Nanosized ZnFe{sub 2}O{sub 4} particles containing traces of {alpha}-Fe{sub 2}O{sub 3} by intent were produced by low temperature chemical coprecipitation methods. These particles were subjected to high-energy ball milling. These were then characterised using X-ray diffraction, magnetisation and dielectric studies. The effect of milling on zinc ferrite particles have been studied with a view to ascertaining the anomalous behaviour of these materials in the nanoregime. X-ray diffraction and magnetisation studies carried out show that these particles are associated with strains and it is the surface effects that contribute to the magnetisation. Hematite percentage, probably due to decomposition of zinc ferrite, increases with milling. Dielectric behaviour of these particles is due to interfacial polarisation as proposed by Koops. Also the defects caused by the milling produce traps in the surface layer contributes to dielectric permittivity via spin polarised electron tunnelling between grains. The ionic mechanism is enhanced in dielectrics with the rise in temperature which results in the increase of dielectric permittivity with temperature. Netherlands 2004-02-01 English Journal Article Journal Name: Journal of Magnetism and Magnetic Materials; Journal Volume: 269; Journal Issue: 2; Other Information: DOI: 10.1016/S0304-8853(03)00596-1; PII: S0304885303005961; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); PBD: Feb 2004 Medium: X; Size: page(s) 217-226 https://doi.org/10.1016/S0304-8853(03)00596-1 [] 2 269 Journal ID: ISSN 0304-8853; JMMMDC; TRN: NL04R0674033693 NLN 2010-12-31 20454750