کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10666452 | 1007705 | 2005 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
On the formation mechanism of BaTiO3-BaZrO3 solid solution through solid-oxide reaction
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: On the formation mechanism of BaTiO3-BaZrO3 solid solution through solid-oxide reaction On the formation mechanism of BaTiO3-BaZrO3 solid solution through solid-oxide reaction](/preview/png/10666452.png)
چکیده انگلیسی
The formation of solid solution composition BaTi0.6Zr0.4O3, from BaCO3, TiO2 and ZrO2 powders has been studied through solid-oxide reaction using TGA/DSC, XRD. BaCO3 decomposes at much lower temperature in the mixture due to the presence of TiO2. BaTiO3 (BT) and BaZrO3 (BZ) start forming from the temperature range 700-800 °C without intermediate formation of BaO or other titanate/zirconate phases. Rate of BaTiO3 formation is higher than BaZrO3 formation due to the lower activation energy (34.3 kcal/mol) required for titanate formation than zirconate (48.4 kcal/mol). Solid solution then forms by diffusion of BaTiO3 into BaZrO3 from 1300 °C onwards. Lattice parameter of initial SS phase is higher, indicating the phase has a coherent interface with zirconate and higher in Zr-concentration than the final product. Activation energy for the SS formation (133 kcal/mol) indicates that Ba and/or O diffusion through SS layer may limit the reaction.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 59, Issue 1, January 2005, Pages 135-138
Journal: Materials Letters - Volume 59, Issue 1, January 2005, Pages 135-138
نویسندگان
J. Bera, S.K. Rout,