کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1462712 | 989636 | 2012 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Synthesis and microwave dielectric properties of pseudobrookite-type structure Mg5Nb4O15 ceramics by aqueous sol-gel technique
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Pseudobrookite-type Mg5Nb4O15 ceramics were prepared by aqueous sol-gel process and microwave dielectric properties were investigated. Highly reactive nanosized Mg5Nb4O15 powders were successfully synthesized at 600 °C in oxygen atmosphere with particle sizes of 20-40 nm firstly and then phase evolution was detected by DTA-TG and XRD. Sintering characteristics and microwave dielectric properties of Mg5Nb4O15 ceramics were studied at different temperatures ranging from 1200 °C to 1400 °C. With the increase of sintering temperature, density, Ér and Q·f values increased, and then saturated at 1300 °C. Excellent microwave properties of Ér â¼11.3, Q·f â¼43,300 GHz and Ïf â¼â58 ppm/°C, were obtained finally. The sintering temperature of Mg5Nb4O15 ceramics was significantly reduced by aqueous sol-gel process compared to conventional solid-state methods.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 38, Issue 5, July 2012, Pages 4271-4276
Journal: Ceramics International - Volume 38, Issue 5, July 2012, Pages 4271-4276
نویسندگان
H.T. Wu, W.B. Wu, Y.L. Yue, Y.M. Chen, F. Yang,