کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9803562 | 1516469 | 2005 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Mechanochemical preparation of nanocrystalline TiO2 powders and their behavior at high temperatures
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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: Mechanochemical preparation of nanocrystalline TiO2 powders and their behavior at high temperatures Mechanochemical preparation of nanocrystalline TiO2 powders and their behavior at high temperatures](/preview/png/9803562.png)
چکیده انگلیسی
Nanocrystalline TiO2 powders were prepared by high-energy ball-milling using zirconia vial and balls. The changes of microstructure caused by material processing were studied using Raman spectroscopy, X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and selected area electron diffraction (SAED). The milling of the starting TiO2 powder (anatase + rutile in traces) induced phase transitions to high-pressure polymorph, TiO2II, and rutile. We found that the phase transition to TiO2II was initiated at the surface of the small particles, while transition to rutile started in their center. Changes in crystallite size during milling process were obtained by the Scherrer method, while the particle size changes were monitored by TEM. The kinetics of phase changes, a decrease in crystallite/particle size, as well as zirconia contamination depended on the powder-to-ball weight ratio. The starting powder and some selected ball-milled samples were investigated in situ by Raman spectroscopy and XRD at high temperatures (up to 1300 °C) to examine their behavior during the sintering process. A difference in the results obtained by these two techniques was explained in frame of basic physical properties characterizing both methods. The morphology of the final sinters was monitored by scanning electron microscopy (SEM).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 398, Issues 1â2, 2 August 2005, Pages 188-199
Journal: Journal of Alloys and Compounds - Volume 398, Issues 1â2, 2 August 2005, Pages 188-199
نویسندگان
A. GajoviÄ, K. FuriÄ, N. TomaÅ¡iÄ, S. PopoviÄ, Ž. Skoko, S. MusiÄ,