کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9761664 | 1498423 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermal disproportionation of SnO under high pressure
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
The kinetics of the disproportionation of SnO to SnO2 and Sn was studied in situ under pressures up to 15 GPa by X-ray powder diffraction with synchrotron radiation. From thermal disproportionation of SnO at different temperatures we extracted the reaction rate law and the reaction rate constants k and activation energy EA for different pressures. Under high pressure a drastic change of the disproportionation reaction is found. While the reaction follows a nucleation and growth mechanism at ambient pressure a diffusion controlled mechanism is observed at pressures of 2 GPa and above. Starting at 5 up to 15 GPa a gradual change back to a nucleation and growth mechanism is observed. For a given temperature the reaction is always faster under pressure than at ambient pressure in the complete studied p/T-region (0-15 GPa, 500-700 K). The reaction rate constant k of the disproportionation of SnO depends on the phase of the emerging metallic tin. The value of k is one order of magnitude lower when β-Sn is formed compared to the case when Sn evolves as a liquid or in the high pressure phase Sn-II. In contrast, the different phases of SnO2 do not noticeably influence the reaction rate. Formation of the intermediate tin oxide Sn2O3 is not observed under high pressure.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 176, Issues 13â14, 29 April 2005, Pages 1327-1332
Journal: Solid State Ionics - Volume 176, Issues 13â14, 29 April 2005, Pages 1327-1332
نویسندگان
H. Giefers, F. Porsch, G. Wortmann,