کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1293615 | 1498269 | 2015 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Alkali-ion concentration dependence of the structure of proton-conducting alkali thio-hydroxogermanates investigated with neutron diffraction
ترجمه فارسی عنوان
وابستگی غلظت آلکالین به ساختار تیتو هیدروکسی زهرمانت های قلیایی پروتون- نوری با استفاده از پراش نوترون
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کلمات کلیدی
انجام پروتون، تیو هیدروکسی ارمنستان، پراش نوترون، سلول سوختی،
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
چکیده انگلیسی
The proton-conducting hydrated alkali thio-hydroxogermanate's MxGeSx(OH)4 â x·yH2O (M = Na and K; x = 1 â 4, y â 0.5 â 2) were investigated by means of neutron diffraction with the aim to elucidate how the structure changes as a function of alkali-ion concentration, x, type of alkali ion, M, and water content, y. For x = 1 â 3 we find that the materials are amorphous and composed of thio-hydroxogermanate anions, water molecules, and charge balancing alkali ions, whereas for x = 4 we find that the materials contain also a crystalline phase, suggesting that it is difficult to prepare purely amorphous materials for the highest alkali-ion concentration, for both the Na and K based materials. For x = 1 â 3, the structure is reflected by an intermediate-range ordering, with a characteristic length-scale ranging from approximately 6 to 9 Ã
, which is dependent on both x and M and which may be related to the separation distance between dimers of thio-hydroxogermanate anions. As x increases, the intermediate-range ordering shortens, possibly as the result of an increasing level of hydration water that may act as a dielectric medium that reduces the repulsive interaction between the negatively charged thio-hydroxogermanate anions and/or between the positively charged alkali ions. A comparison of the structural results to the reported conductivities of the same materials indicates a non-trivial relationship, which depends on both the type and concentration of alkali ions, as well as on the level of hydration water.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 274, June 2015, Pages 40-45
Journal: Solid State Ionics - Volume 274, June 2015, Pages 40-45
نویسندگان
Maths Karlsson, Jonas Nordström, Aleksandar Matic, Steve W. Martin, Silvia Imberti, Daniel T. Bowron,