کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1526732 1511849 2008 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural alterations during mechanochemical activation of a titanium–magnetite mixture
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Structural alterations during mechanochemical activation of a titanium–magnetite mixture
چکیده انگلیسی

In this work, mechanochemical activation and thermal behaviour of (Ti + Fe3O4) mixtures in Ti/Fe3O4 molar ratios 0.5, 1, and 1.5, are studied. The samples were activated under Ar atmosphere, thermally treated at temperatures ranging between 400 and 700 °C, and analyzed by XRD and Rietveld analysis, SEM and EPMA. By XRD, a progressive decrease in crystallinity with the activation time of was observed. For the samples with lower Ti contents, the system evolved towards the formation of a ulvospinel (Fe2TiO4)–magnetite (Fe3O4) solid solution, while for higher Ti contents the major phase obtained was ilmenite (FeTiO3). During the activation at room temperature, low crystalline intermediate phases (FeO + TiO, FeO, pseudobrookite [Fe2TiO5]) were generated, depending on the initial mixture composition. Thermal treatments resulted in a progressive structural ordering, with lattice parameters slightly greater than those of the original spinel.These results suggest that during the activation at room temperature, the Ti reduces the Fe of the spinel and partially replaces it in the lattice.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 111, Issues 2–3, 15 October 2008, Pages 341–345
نویسندگان
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