کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1622573 1516401 2009 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and magnetic properties of strontium hexaferrite from celestite ore
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Synthesis and magnetic properties of strontium hexaferrite from celestite ore
چکیده انگلیسی

Nanocrystalline strontium hexaferrite (SrFe12O19) powders have been synthesized from Egyptian celestite ore (SrSO4), as a source of strontium, via co-precipitation route. The raw celestite ore was first dissolved in hydrochloric acid to remove about 10% CaO and the acid soluble impurities associated with the ore. Then, the treated celestite was washed and dried followed by a reduction with carbon to give acid–water soluble strontium sulfide SrS. The ferrite precursors were obtained from a precipitation of the produced SrS dissolved in dil. HCl and pure ferric chloride at pH 10 using 5 M sodium hydroxide. These precursors were annealed at 1000 °C for constant time 2 h in open atmosphere. The effect of Fe3+/Sr2+ mole ratio on the formation, crystallite size, morphology and magnetic properties were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and VSM, respectively. The results obtained showed that the single phase SrFe12O19 powders was achieved at the Fe3+/Sr2+ mole ratios 8.57 and 8.00 at annealing temperature 1000 °C for 2 h. The maximum saturation magnetization (74.15 emu/g) was achieved at the Fe3+/Sr2+ mole ratio to 8.57 and annealing temperature 1000 °C due to the formation of a uniform-like hexagonal shape structure. Moreover, wide coercivities can be obtained at different synthesis conditions (2011–3504 Oe).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 476, Issues 1–2, 12 May 2009, Pages 373–378
نویسندگان
, , , ,