کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1616912 | 1005672 | 2011 | 5 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Influence of surfactants on co-precipitation synthesis of strontium ferrite Influence of surfactants on co-precipitation synthesis of strontium ferrite](/preview/png/1616912.png)
Strontium ferrite (SrFe12O19) particles were prepared by co-precipitation method. The ferrite precursors were produced from aqueous mixtures of ferric chloride and strontium nitrate by co-precipitation, using 3 mol/L sodium hydroxide aqueous solutions as precipitant. Three surfactants sodium dodecyl sulfate (SDS), polyethylene glycol 6000 (PEG-6000), cetyltrimethylammonium bromide (CTAB), were applied and the influence of surfactants on the properties of the strontium ferrite particles was studied. The ferrite precursors were first precalcined in a muffle furnace at 400 °C and then mixed with KCl and NaCl using a planetary milling machine in order to lower the calcination temperature. Subsequently the mixtures were calcined at various temperatures. Structure and magnetic properties of the particles were characterized by X-ray powder diffraction, transmission electron microscopy and vibrating sample magnetometer. In this paper, effects of Fe3+/Sr2+ mole ratio were first verified and annealing temperatures were then discussed. The results show the strontium ferrite phase begins to form at 650 °C and complete at 800 °C after calcination, and the particles prepared using CTAB exhibit the best properties with respect to particle size and dispersibility.
► Three surfactants SDS, nonionic surfactant (PEG-6000), CTAB, were applied.
► The ferrite precursors were calcinated with KCl and NaCl in order to lower the calcination temperature.
► The effects of Fe3+/Sr2+ mole ratio were first verified and annealing temperatures were then discussed.
Journal: Journal of Alloys and Compounds - Volume 509, Issue 41, 13 October 2011, Pages 10127–10131