کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10629859 | 991194 | 2005 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Submicrometric NASICON ceramics with improved electrical conductivity obtained from mechanically activated precursors
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Na3Si2Zr1.88Y0.12PO11.94 was for the first time synthesised using mechanically activated mixtures of (ZrO2)0.97(Y2O3)0.03, Na3PO4·12H2O and SiO2 aiming to lower the sintering temperature thus improving chemical homogeneity. The best result was obtained with powder mixtures activated in Teflon containers with partial amorphisation of the reactants attained after milling for 70 h at a maximum of 300 rpm, without significant contamination. The microstructure consists of 300-500 nm agglomerates of smaller grains with size in the range 50-100 nm. Dense, single phase ceramics with submicrometric grain size were obtained from the activated mixture after sintering at 1050 °C for 10 h. The ionic conductivity of these ceramics is 2.5Ã10â3 S cmâ1 at room temperature, and 0.24 S cmâ1 at 300 °C. These values are higher than those obtained with non-activated solid state reaction samples and amongst the highest reported in the literature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 25, Issue 4, April 2005, Pages 455-462
Journal: Journal of the European Ceramic Society - Volume 25, Issue 4, April 2005, Pages 455-462
نویسندگان
R.O. Fuentes, F.M. Figueiredo, M.R. Soares, F.M.B. Marques,