Formation of cadmium-containing W-type hexagonal ferrite |
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Authors: | G Albanese A Deriu G Calestani F Leccabue B E Watts |
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Affiliation: | (1) Department of Physics, University of Parma, V.le delle Scienze, 43100 Parma, Italy;(2) Centro di Studio di Strutturistica Diffrattometrica/CNR, Department of Chemistry, University of Parma, V.le delle Scienze, 43100 Parma, Italy;(3) Institute MASPEC/CNR, Via Chiavari 18/a, 43100 Parma, Italy |
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Abstract: | The main steps of the phase formation processes which take place in samples of W-type hexaferrites containing cadmium, prepared by chemical coprecipitation, have been analysed. The processes were followed by Mössbauer spectroscopy, powder X-ray diffraction, thermomagnetic analysis and magnetic measurements. For samples heated in the temperature range 1000–1100°C, the phase formation processes are the same as those verified for the other zinc, nickel, cobalt W-type compounds: forT
h=1000°C the only phases present are SrFe12O19 (M-type ferrite) and CdFe2O4 (spinel ferrite); in contrast, forT
h>1100°C, the solid state reaction between the M-type and the spinel phases does not take place and the spinel phase decomposes, leading to the formation of -Fe2O3. |
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