کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8948510 | 1645668 | 2018 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Crystal structures and microwave dielectric properties of low-firing Ca5Zn4-xMgxV6O24 ceramics
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Ca5Zn4-xMgxV6O24 (xâ¯=â¯0-3) microwave dielectric ceramics with low sintering temperature were synthesized via the conventional solid-state reaction. Effects of the substitution of Mg2+ for Zn2+ on crystal structures and microwave dielectric properties were investigated. XRD and Rietveld refinement showed the solid solution single phase formed when 0â¯â¤â¯xâ¯â¤â¯2, but a few ZnO was observed when xâ¯=â¯3. Meanwhile, the lattice parameters were found to decrease monotonously with Mg content increasing. The vibration modes of Raman were confirmed and the relationship with microwave dielectric properties was analyzed. Appropriate substitution of Mg2+ improved the packing fraction, the cation ordering degree, and the Y-site bond valence, contributing to high QÃf and low | Ïf |. However, the εr reduced with the increasing content of Mg2+ due to the decrease of ion polarizability. Finally, the best microwave dielectric properties were achieved at xâ¯=â¯2 with εr =â¯11.0, Qâ¯Ãâ¯fâ¯=â¯66,365â¯GHz (at 10.0â¯GHz), and Ïf =â¯â80.4â¯ppm/°C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 15, 15 October 2018, Pages 18250-18255
Journal: Ceramics International - Volume 44, Issue 15, 15 October 2018, Pages 18250-18255
نویسندگان
Bo Li, Jiawei Tian, Lei Qiu,