کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1297692 | 1498336 | 2010 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The structure and ionic conductivity of the fluorite-related isostructural materials Bi20Ca7NbO39.5, Bi10.75Ca4.375GaO22 and quenched Bi9ReO17
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The structure and ionic conductivity of fluorite-related Bi20Ca7NbO39.5, Bi10.75Ca4.375GaO22 and the high temperature form of Bi9ReO17, formed by quenching from 800 °C, were studied by neutron powder diffraction, X-ray powder diffraction and impedance spectroscopy. All materials formed distorted δ-Bi2O3-related monoclinic superstructures of a fluorite-related hexagonal subcell. The supercell, with P21/m symmetry, is derived from the cubic fluorite subcell axes (af, bf, cf) using the transformation matrix: â1110.50.501â11. Both Bi20Ca7NbO39.5 and Bi10.75Ca4.375GaO22 are shown to display good oxide ion conductivity (2.52 Ã 10â 5 Ωâ 1 cmâ 1 and 1.02 Ã 10â 5 Ωâ 1 cmâ 1 at 673 K with activation energies of 1.12 eV and 1.25 eV, respectively); quenched Bi9ReO17 has enhanced oxide ion conductivity (1.44 Ã 10â 3 Ωâ 1 cmâ 1 at 673 K) with a lower activation energy of 0.76 eV.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 181, Issues 37â38, 13 December 2010, Pages 1674-1679
Journal: Solid State Ionics - Volume 181, Issues 37â38, 13 December 2010, Pages 1674-1679
نویسندگان
M. Thompson, C. Greaves,