کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1622351 | 1516404 | 2009 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Mecanosynthesis of partially inverted zinc ferrite
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Synthesis of zinc ferrite (ZnFe2O4) by high-energy ball-milling from a powder mixture of zinc oxide (ZnO) and hematite (α-Fe2O3) is investigated. The millings are performed under air using tungsten carbide vials and balls. The spinel phase appears within 2 h grinding and the reaction is almost complete after 24 h. The broadening of X-ray diffraction lines shows that the crystallite size is around 10 nm. Mössbauer spectra indicate that there is some inversion in the ferrite, leading to the formula (Zn0.312+Fe0.693+)A(Zn0.692+Fe1.313+)BO42â for the 24 h sample. We also show that preliminary millings of the initial oxides (zincite and hematite) slow down the reaction. Finally, dilatometric studies show that the shrinkage proceeds in several steps, due to a grain size distribution in the sample.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 473, Issues 1â2, 3 April 2009, Pages 303-307
Journal: Journal of Alloys and Compounds - Volume 473, Issues 1â2, 3 April 2009, Pages 303-307
نویسندگان
Virginie Nachbaur, Guillaume Tauvel, Thomas Verdier, Malick Jean, Jean Juraszek, David Houvet,