کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1527625 | 1511855 | 2007 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Low temperature sintering and magnetic properties of garnet microwave magnetic materials
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
This study investigated the low temperature sintering for microwave magnetic materials [Bi-incorporated calcium vanadium garnets (Bi-CVG), (Bi0.75Ca1.2Y1.05)(V0.6Fe4.4)O12]. Sintering behavior and magnetic properties of Bi-CVG materials prepared from ultrafine-sized powders were compared with those of materials prepared from micron-sized powders. The activation energy for densification (Ed), derived from temperature and time dependence of materials' density, is markedly reduced by using ultrafine-sized powders as starting materials, i.e., (Ed)ultra = 7.04 kJ moleâ1 and (Ed)micron = 39.5 kJ moleâ1 for ultrafine and micron powder sintered samples, respectively. The activation energy for densification is further reduced to 4.59 kJ moleâ1 by using microwave sintering process with ultrafine powders. Remnant magnetization (Br) of the Bi-CVG materials is similar for samples possessing the same high density, regardless of the microstructures. Conversely, the coercive field (Hc) of the materials is larger for samples containing fine grains and vice versa. While the low frequency magnetic properties of the Bi-CVG materials are microstructure-dependent, the microwave magnetic properties of the materials are not.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 105, Issues 2â3, 15 October 2007, Pages 408-413
Journal: Materials Chemistry and Physics - Volume 105, Issues 2â3, 15 October 2007, Pages 408-413
نویسندگان
Chien-Yie Tsay, Chung-Kwei Lin, Hua-Chi Cheng, Kuo-Shung Liu, I.-Nan Lin,