کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10625297 989622 2014 34 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Microwave dielectric and thermal properties of mixed rare earth ortho phosphate [REmixPO4]
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Microwave dielectric and thermal properties of mixed rare earth ortho phosphate [REmixPO4]
چکیده انگلیسی
A cost effective protocol to develop microwave substrate is proposed whereby a mixed rare earth orthophosphate [REMIXPO4] ceramic was prepared using a natural mixture of rare earth oxides, which is a byproduct derived from beach sand after thorium extraction. The Rietveld refinement of X-ray powder diffraction pattern confirms that the compound belongs to P21/n space group with monoclinic crystal symmetry. The scanning electron microscopy combined with energy dispersive X-ray analysis was performed to study the surface morphological characteristics. The ceramic sintered at 1250 °C showed a relative permittivity (εr) of 9.6 (at 13.5 GHz), high quality factor (Qu×f) of 45,200 GHz and a τf of −35 ppm/°C. The room temperature thermal conductivity of the sintered ceramic is 3.25 Wm−1 K−1 while the average coefficient of thermal expansion (CTE) is 7.3 ppm/°C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 40, Issue 8, Part B, September 2014, Pages 13075-13081
نویسندگان
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