کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10629747 | 991145 | 2012 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Phase equilibria and electrical properties of pyrochlore and zirconolite phases in the Bi2O3-ZnO-Ta2O5 system
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The complete subsolidus phase diagram of the system Bi2O3-ZnO-Ta2O5, including cubic pyrochlore and monoclinic zirconolite phases, has been determined at 950-1050 °C. Through systematic heat treatment and X-ray diffraction of over 100 compositions, the layout of compatibility triangles (both 2-phase and 3-phase) and single phase solid solution areas has been determined. Pyrochlore and zirconolite phases have ideal nominal compositions Bi1.5Zn1.0Ta1.5O7 and Bi2(Zn1/3Ta2/3)2O7 respectively, but both form solid solution areas. The sintering condition of pyrochlore pellets has been optimised to obtain high density ceramics with minimal weight loss: optimised condition is 1100 °C for pellets covered with sacrificial powder. Permittivity, Éâ² dielectric loss and temperature coefficient of capacitance, TCC, of single phase materials were measured using impedance spectroscopy; Éâ² and TCC show little variation with composition but the losses are higher for Zn-deficient compositions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 32, Issue 3, March 2012, Pages 671-680
Journal: Journal of the European Ceramic Society - Volume 32, Issue 3, March 2012, Pages 671-680
نویسندگان
C.C. Khaw, K.B. Tan, C.K. Lee, A.R. West,