کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5439271 | 1398194 | 2016 | 27 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Structural ordering and dielectric properties of Ba3CaNb2O9-based microwave ceramics
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Structural ordering and dielectric properties of Ba3CaNb2O9-based microwave ceramics Structural ordering and dielectric properties of Ba3CaNb2O9-based microwave ceramics](/preview/png/5439271.png)
چکیده انگلیسی
Ba3CaNb2O9 is a 1:2 ordered perovskite which presents a trigonal cell within the D3d3 space group. Dense ceramics of Ba3CaNb2O9 were prepared by the solid-state reaction route, and their microwave dielectric features were evaluated as a function of the sintering time. From Raman spectroscopy, by using group-theory calculations, we were able to recognize the coexistence of the 1:1 and 1:2 ordering types in all samples, in which increasing the sintering time tends to reduce the 1:1 domain, leading to an enhancement of the unloaded quality factor. We concluded that this domain acts as a lattice vibration damping, consequently raising the dielectric loss at microwave frequencies. The best microwave dielectric parameters were determined in ceramics sintered at 1500 °C for 32h: εâ²Â ~ 43; QuÃfr = 15,752 GHz; Ïf ~ 278 ppm °Câ1.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 42, Issue 16, December 2016, Pages 18087-18093
Journal: Ceramics International - Volume 42, Issue 16, December 2016, Pages 18087-18093
نویسندگان
J.E.F.S. Rodrigues, P.J. Castro, P.S. Pizani, W.R. Correr, A.C. Hernandes,