Effect of iron addition on the properties of ZnO obtained by precipitation

Daniel Sibera 1Urszula Narkiewicz 1Izabela Kudelska 2Witold Daniel Dobrowolski 2

1. Szczecin University of Technology, Institute of Chemical and Environment Engineering, Szczecin 70-322, Poland
2. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland

Abstract

New ferromagnetic semi-conductors are interesting because of the expectations connected with their use in magnetoelectronic or spintronic devices. Potential candidates are semi-conductive oxides of metals doped with ions or oxides of transition metals, as for example zinc oxide doped with iron oxide. Such samples were prepared by wet chemical method - precipitation from nitrate solutions using ammonia. The obtained hydroxides were filtered, dried and calcined at 300 0C during 1 hour. A series of samples containing 5 to 95 wt.% of Fe2O3 was obtained. The prepared samples are ferromagnetic. The phase composition of the samples was determined using XRD. Depending on the chemical composition the phases of hexagonal ZnO, and/or romboedric Fe2O3 and/or cubic ZnFe2O4 were identified. The mean crystallite size of these phases, determined using Scherrer’s formula, varied from 8 to 30 nm. The real chemical composition of the samples determined using ICP AES method was close to the assumed one. The measurements of density and surface area showed a good quality of nanopowders. The morphology of the samples was investigated using scanning electron microscopy. Spherical or elongated nano-grains can be observed. The measurements of magnetization were also carried out.

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Presentation: Poster at E-MRS Fall Meeting 2007, Symposium A, by Daniel Sibera
See On-line Journal of E-MRS Fall Meeting 2007

Submitted: 2007-05-07 10:57
Revised:   2009-06-07 00:44
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