کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7735299 | 1497961 | 2014 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of anionic vacancies on the conductivity of La9.33Si6âxAlxO26âx/2 oxide conductors with an oxyapatite structure
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Influence of anionic vacancies on the conductivity of La9.33Si6âxAlxO26âx/2 oxide conductors with an oxyapatite structure Influence of anionic vacancies on the conductivity of La9.33Si6âxAlxO26âx/2 oxide conductors with an oxyapatite structure](/preview/png/7735299.png)
چکیده انگلیسی
Al-doped oxyapatite-type lanthanum silicates La9.33Si6âxAlxO26âx/2â¡x/2 (x = 0, 0.4, 0.8 and 1) powders have been prepared by the solid state reaction at high temperature in order to determine the influence of anionic vacancies on the electrical properties of the material. The crystal structure and properties of La9.33Si6âxAlxO26âx/2â¡x/2 powders have been studied by X-ray diffraction (XRD) patterns, magic-angle spinning nuclear magnetic resonance (MAS-NMR) technique and complex impedance analysis. All the compounds of La9.33Si6âxAlxO26âx/2â¡x/2 oxyapatites doped with Al3+ consist of a hexagonal structure with a P63/m space group. Lanthanum silicates doped with trivalent Al3+ have a higher conductivity than those without trivalent Al3+ at the Si4+ site. The extra oxygen O(4) atoms in site 2a (0, 0, 0.25) occupy channels running through the structure that are responsible for the high oxygen ion conduction. However, Al substitution seems to produce oxygen vacancies and create another pathway for oxide ions. The expansion of the channels (La(1)-O(4) distance) leads to an increase in the conductivity. For the best sample (x = 1), the conductivity observed was 5 Ã 10â3 S cmâ1 at 750 °C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Power Sources - Volume 271, 20 December 2014, Pages 203-212
Journal: Journal of Power Sources - Volume 271, 20 December 2014, Pages 203-212
نویسندگان
A. Inoubli, M. Kahlaoui, I. Sobrados, S. Chefi, A. Madani, J. Sanz, A. Ben Haj Amara,