کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9761732 | 1498426 | 2005 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Proton conductivity and structural dynamics in Cs5H3(SO4)4/SiO2 composites
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
Cs5H3(SO4)4·yH2O and (1âx)Cs5H3(SO4)4/xSiO2 composite electrolytes (x=0.3-0.9) have been investigated by means of impedance, IR and Raman spectroscopy, differential scanning calorimetry and X-ray analysis. Cs5H3(SO4)4·yH2O has a phase transition to a high-conductive disordered state (Ïâ¼10â2 S cmâ1) at Ttr=418 K induced by changes in the structural-water content. This phase transition is shown to be reversible yet the converse transition from the high-temperature phase is slow. Although heterogeneous doping causes only a moderate increase in the low-temperature conductivity of the ionic salt, it stabilizes the high-conductive disordered state. The vibration spectroscopy data confirm the formation of the Cs5H3(SO4)4 disordered state in composites. The composite conductivity does not depend on the composition up to x=0.7 and decreases at xâ¥0.8 due to the percolation effect. The structural dynamics of SO4 tetrahedra is shown to correlate with the proton conductivity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 176, Issues 7â8, 28 February 2005, Pages 767-771
Journal: Solid State Ionics - Volume 176, Issues 7â8, 28 February 2005, Pages 767-771
نویسندگان
G.V. Lavrova, V.G. Ponomareva, E.B. Burgina,