کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9694276 | 1459644 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Reaction kinetics and formation mechanism of magnesium ferrites
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The reaction kinetics on the spinel formation reaction of Mg-ferrite formation during the heat-treatment of ferric and magnesium oxide powders has been evaluated by both Jander and Ginstling-Brounstein models. It revealed that the spinel formation could be successfully described by Jander's equation. The rate constant calculated by the Jander equation was 3 à 10â6 sâ1 at 800 °C and increased to 1.4 à 10â3 sâ1 as the reaction temperature increased up to 1000 °C. The activation energy of spinel formation was evaluated to be 335 kJ/mol, which was also confirmed by the differential thermal analysis. The activation energy coincided with that of Mg2+ diffusion reaction within MgO lattice suggesting this acted as a rate-determining step in the entire reaction.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 425, Issues 1â2, 20 January 2005, Pages 131-136
Journal: Thermochimica Acta - Volume 425, Issues 1â2, 20 January 2005, Pages 131-136
نویسندگان
Jong-Gyu Paik, Man-Jong Lee, Sang-Hoon Hyun,