کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1491942 992363 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis of Ga-doped Ge-based apatites: Effect of dopant and cell symmetry on oxide ion conductivity
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Synthesis of Ga-doped Ge-based apatites: Effect of dopant and cell symmetry on oxide ion conductivity
چکیده انگلیسی

Apatite-type rare earth silicates/germanates are attracting significant interest as a new class of oxide ion conductors. For the germanates, La9.33+x(GeO4)6O2+3x/2, it has been shown that, depending on composition, the cell can be either hexagonal or triclinic, with evidence for reduced low temperature conductivities for the latter, attributed to increased defect trapping in this lower symmetry cell. In this paper the effect of Ga doping on the cell symmetry and conductivity is reported, with the observation of triclinic cells across the series La10(GeO4)6−x(GaO4)xO3−x/2. Through co-doping with Y on the La site, i.e. La8Y2(GeO4)6−x(GaO4)xO3−x/2, it is shown that hexagonal cells are obtained, and the dependence of the conductivity on oxygen content/Ga content is discussed. In particular it is shown that the stabilisation of the hexagonal cell through Y doping enhances the low temperature conductivity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 43, Issue 12, 1 December 2008, Pages 3627–3632
نویسندگان
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