کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10632066 992382 2005 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Formation of SrTiO3 from Sr-oxalate and TiO2
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Formation of SrTiO3 from Sr-oxalate and TiO2
چکیده انگلیسی
SrTiO3 powder has been prepared from Sr-oxalate and TiO2 precursors, instead of using titanyl-oxalate. Sr-oxalate was precipitated from nitrate solution onto the surface of suspended TiO2 powders. Crystallization of SrTiO3 from the precursor was investigated by TGA, DTA and XRD analysis. It is evident that precursor, upon heating, dehydrates in two stages, may be due to the presence of two different types of Sr-oxalate hydrates. Dehydrated precursor then decomposes into SrCO3 and TiO2 mixture. Decomposition of SrCO3 and simultaneous SrTiO3 formation occur at much lower temperature, from 800 °C onwards, due to the fine particle size of the SrCO3 and presence of acidic TiO2 in the mixture. The precursor completely transforms into SrTiO3 at 1100 °C. About 90 nm size SrTiO3 crystallites are produced at 1100 °C/1 h, due to the lower calcination temperature and better homogeneity of the precursor.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Research Bulletin - Volume 40, Issue 4, 20 April 2005, Pages 599-604
نویسندگان
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