کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1298744 | 1498371 | 2008 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Oxide ion distribution and conductivity in Bi7Nb2 â 2xY2xO15.5 â 2x
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Oxide ion distribution and conductivity in Bi7Nb2 â 2xY2xO15.5 â 2x Oxide ion distribution and conductivity in Bi7Nb2 â 2xY2xO15.5 â 2x](/preview/png/1298744.png)
چکیده انگلیسی
A detailed investigation using X-ray and neutron powder diffraction as well as ac impedance spectroscopy in the substituted bismuth oxide system Bi7Nb2 â 2xY2xO15.5 â 2x is presented. Combined refinement of variable temperature X-ray and neutron powder diffraction data reveal both compositional and temperature dependencies of the oxide ion distribution in this system. Oxide ions are found to be distributed over three crystallographically distinct sites, with one site exclusively associated with the dopant cations Nb5+ and Y3+ leading to a distorted octahedral geometry for these ions. Changes in the oxide ion distribution are correlated with a non-linear thermal expansion as well as non-Arrhenius behaviour of total conductivity at high temperatures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 179, Issues 21â26, 15 September 2008, Pages 975-980
Journal: Solid State Ionics - Volume 179, Issues 21â26, 15 September 2008, Pages 975-980
نویسندگان
F. Krok, I. Abrahams, M. Holdynski, A. Kozanecka-Szmigiel, M. Malys, M. Struzik, X. Liu, J.R. Dygas,