کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1620666 | 1516385 | 2010 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Increased stability of nanocrystals of Gd2(Ti0.65Zr0.35)2O7 pyrochlore at high pressure
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Increased stability of nanocrystals of Gd2(Ti0.65Zr0.35)2O7 pyrochlore at high pressure Increased stability of nanocrystals of Gd2(Ti0.65Zr0.35)2O7 pyrochlore at high pressure](/preview/png/1620666.png)
چکیده انگلیسی
Pyrochlore powders Gd2(Ti0.65Zr0.35)2O7, were synthesized by mechanical milling of constituent oxides, and their grain-sizes (from <20 nm to μm-sized) were controlled by subsequent thermal treatments (800-1500 °C). Using in situ X-ray diffraction (XRD) measurements at pressures up to more than 40 GPa, the bulk moduli were determined to be greater (>10%) than the values of the end-member compositions: Gd2Ti2O7 and Gd2Zr2O7. The higher values are attributed to the mixed occupancy of cations at the A- and B-sites. There was also a significant increase in the stability of Gd2(Ti0.65Zr0.35)2O7 as the grain-size decreased below a critical value. The nanocrystalline sample, <20 nm, had a transition to the high-pressure phase that was â¼10 GPa higher than that for the same composition but with grain-size larger than 100 nm.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 494, Issues 1â2, 2 April 2010, Pages 34-39
Journal: Journal of Alloys and Compounds - Volume 494, Issues 1â2, 2 April 2010, Pages 34-39
نویسندگان
F.X. Zhang, J. Lian, J.M. Zhang, K.J. Moreno, A.F. Fuentes, Zhongwu Wang, R.C. Ewing,