کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10630205 | 991247 | 2005 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Crystal structures of CeO2-ZrO2-Ta2O5 ternary system studied by Rietveld method
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Crystal structures of CeO2-ZrO2-Ta2O5 ternary system studied by Rietveld method Crystal structures of CeO2-ZrO2-Ta2O5 ternary system studied by Rietveld method](/preview/png/10630205.png)
چکیده انگلیسی
Solid solutions of the pseudo-ternary system Ce0.6/(1+x)Zr(Hf)(0.4âx)/(1+x)Ta2x/(1+x) (0.00 ⤠x ⤠0.06), i.e. having molecular composition 1, 2, 3, 4, 5 and 6% in Ta2O5, have been prepared by traditional ceramic methods (1500 °C for 3 h). SEM observations and analysis of the X-ray diffraction powders allowed to establish that the solubility of Ta2O5 in the above mentioned system is 4 %mol. The Rietveld analysis of the powder X-ray diffraction data has shown that all the samples of the solid solution crystallize in tetragonal space group P42/nmc (No. 137) but are nearly cubic, space group Fm3¯m (No. 225). The freshly prepared specimens (from 1 to 4 %mol of Ta2O5) show additional peaks due to a tetragonal supercell and also to a modulated structure. However, the modulated peaks disappear after 8 months. Compositions containing 5 and 6% of Ta2O5 show also additional peaks due to a small quantity of two crystalline phases having approximate composition: ZrO2-2CeO2-Ta2O5 and 2CeO2-Ta2O5 (later on identified as CeTaO4).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 25, Issue 11, July 2005, Pages 1863-1876
Journal: Journal of the European Ceramic Society - Volume 25, Issue 11, July 2005, Pages 1863-1876
نویسندگان
Dore Augusto Clemente, Elio Lucchini, Sergio Meriani, Noella Furlan,