کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9829535 | 1524493 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Formation and growth of ice XI: A powder neutron diffraction study
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We measured neutron diffraction profiles of powdered KOD-doped D2O ice to investigate the formation and growth of ice XI, a deuterium-ordered phase of ice, from ice Ih, a disordered phase. During the measurements, the ice was annealed at 57Â K for about 17Â h, and then warmed up and kept at 68Â K for about 55Â h, which are below the transition temperature Tc=76K. The diffraction profiles for the doped ice at 57Â K did not change with time and were close to those for ice Ih with the deuterium-disordered arrangement. However, when the temperature increased from 57 to 68Â K, the diffraction profiles changed. We carried out the Rietveld analysis with the parameters for a two-phase model to obtain the structural evidence of the appearance and the growth of ice XI. The analysis provided evidence of ice XI as space group Cmc21 at 68Â K. The temporal increase of the mass fraction of ice XI showed that nucleation of ice XI began just after warming up to 68Â K. Then, ice XI grew for several days in the doped ice. This study provides first structural observations of the growth of ice XI.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Crystal Growth - Volume 282, Issues 1â2, 15 August 2005, Pages 251-259
Journal: Journal of Crystal Growth - Volume 282, Issues 1â2, 15 August 2005, Pages 251-259
نویسندگان
Hiroshi Fukazawa, Akinori Hoshikawa, Hiroki Yamauchi, Yasuo Yamaguchi, Yoshinobu Ishii,