کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7897776 | 1510127 | 2018 | 13 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Sub-solidus phase equilibria in the YO1.5-TaO2.5 system
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The phase equilibria in the YO1.5-TaO2.5 binary system were studied in air from 1250â¯Â°C to 1700â¯Â°C across the entire composition range, clarifying discrepancies in previous investigations. Materials were synthesized by precursor routes and phases identified by X-ray diffraction and Raman spectroscopy. Solubility limits were determined using TEM/EDS and EPMA. The fluorite phase field was shown to extend down to at least 1250â¯Â°C. Ordering phenomena in two closely related phases near Y3TaO7 were investigated, suggesting a second-order ordering relationship between them. The order-disorder transformation to fluorite was observed to occur through formation of a superstructure. The homogeneity range for YTa7O19 was expanded based on chemical analysis, while YTa3O9 was shown to be a line compound. The emerging understanding provides valuable insight into related ternary systems as well as inputs for thermodynamic assessments.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 38, Issue 14, November 2018, Pages 4786-4798
Journal: Journal of the European Ceramic Society - Volume 38, Issue 14, November 2018, Pages 4786-4798
نویسندگان
Abel N. Fernandez, Chandra A. Macauley, Daesung Park, Carlos G. Levi,