کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9817621 | 1518769 | 2005 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Optimizing synthesis of Na2Ti2SiO7 · 2H2O (Na-CST) and ion exchange pathways for Cs0.4H1.6Ti2SiO7 · H2O (Cs-CST) determined from in situ synchrotron X-ray powder diffraction
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سطوح، پوششها و فیلمها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Observation of wide angle diffraction data collected in situ during synthesis of Na-CST (Na2Ti2O3SiO4 · 2H2O) showed initial crystallization of a precursor phase (SNT) at 30 °C followed by conversion to CST after 1 h at 220 °C. In situ studies of Cs+ ion exchange into the H+ form of CST showed a site-by-site ion exchange pathway accompanied by a simultaneous structural transition from P42/mbc (cell parameters a = 11.0690(6) Ã
, c = 11.8842(6) Ã
) to P42/mcm (cell parameters a = 7.847(2) Ã
, c = 11.9100(6) Ã
). After approximately 18% Cs+ exchange into site designated Cs2 in space group P42/mcm, a site designated Cs1 in space group P42/mcm began to fill at the center of the 8MR windows until a maximum of approximately 22% exchange was achieved for Cs1. Bond valence sums of site Cs1 to framework O2â are 1.00 v.u., while bond valence sums of site Cs2 to framework O2â are 0.712 v.u. suggesting Cs1 to have a more stable bonding environment.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 238, Issues 1â4, August 2005, Pages 61-69
Journal: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms - Volume 238, Issues 1â4, August 2005, Pages 61-69
نویسندگان
A.J. Celestian, D.G. Medvedev, A. Tripathi, J.B. Parise, A. Clearfield,