کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7999211 | 1516265 | 2015 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Phase composition and microwave dielectric properties of SrTiO3 modified Mg2Al4Si5O18 cordierite ceramics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The effects of SrTiO3 addition on phase composition and microwave dielectric properties of cordierite (Mg2Al4Si5O18) ceramics had been investigated in this paper. X-ray diffraction data showed that (1 â x)Mg2Al4Si5O18-xSrTiO3|(1 â x)MAS â xST (0 ⩽ x ⩽ 0.35)| ceramics presented β-cordierite solid solution within 0 < x ⩽ 0.10. In the range of 0.15 ⩽ x ⩽ 0.35, the perovskite-structured SrTiO3 and monoclinic phase of SrAl2Si2O8 feldspar were detected. Rietveld refinement of XRD data showed the shapes of [(Si4Al2)O18] hexagonal rings in (1 â x)MAS-xST (0 < x ⩽ 0.10) happened to adjust from non-symmetry rings to centro-symmetry equilateral rings, along with the solution of SrTiO3 into cordierite. The densification sintering temperatures of (1 â x)MAS-xST ceramics were effectively lowered as to the effect of SrAl2Si2O8 feldspar acting as liquid sintering aids, accompanying the improvement of microstructure of (1 â x)MAS-xST (0 ⩽ x ⩽ 0.35) ceramics. Finally, the (1 â x)MAS-xST (x = 0.10) ceramics possessed the best optimal Qf value: εr = 6.53, Qf = 80,600 GHz (fo = 13.6 GHz), Ïf = â18 ppm/°C. The (1 â x)MAS-xST (x = 0.20) ceramics achieved a relative stable temperature coefficient of resonant frequency with: εr = 6.01, Qf = 51,800 GHz (fo = 13.1 GHz), Ïf = â11 ppm/°C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 628, 15 April 2015, Pages 57-62
Journal: Journal of Alloys and Compounds - Volume 628, 15 April 2015, Pages 57-62
نویسندگان
Kaixin Song, Song Wu, Peng Liu, Huixing Lin, Zhihua Ying, Peng Zheng, Weitao Su, Jiangxia Deng, Liang Zheng, Huibin Qin,