کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1620445 1516387 2010 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microstructural evolution in BaO-Y2O3-Co3O4 mixtures during high-energy milling and its role in the formation of YxBa1−xCoO3−δ and YBaCo4O7
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Microstructural evolution in BaO-Y2O3-Co3O4 mixtures during high-energy milling and its role in the formation of YxBa1−xCoO3−δ and YBaCo4O7
چکیده انگلیسی
X-ray diffraction study of the microstructural evolution induced by high-energy ball milling and thermal treatment (TT) of the quaternary Y-Ba-Co-O system is described. Mixtures of BaO-Co3O4-Y2O3 were milled for up to 39 h. No reaction was observed during the milling and the threshold behavior of the system yields to mixtures of amorphous and crystalline phases. During thermal treatment it was observed that the microstructure is temperature dependent with a critical temperature of transformation between 700 and 900 °C. Samples TT at 600-700 ° C show three phases (Co3O4, Y2O3 and the new phase YxBa1−xCoO3−δ; x∼ 0.29(2)), while samples TT at 900 ° C leads to the formation of a single phase (YBaCo4O7). The crystal structure of YxBa1−xCoO3−δ is described and a possible mechanism of its formation is proposed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 492, Issues 1–2, 4 March 2010, Pages 368-372
نویسندگان
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