کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7990849 | 1516131 | 2018 | 23 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Improved magnetic properties of Zn-substituted strontium W-type hexaferrites
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
The Zn2+ substitution for the Fe2+ site was found to be effective for the improvement of the saturation magnetization (Ms) of strontium W-type hexaferrite (SrFe18O27). For this study, polycrystalline SrFe18O27 with various Zn-substituents of SrZnxFe(2-x)Fe16O27 (SrZnxFe(2-x)W, 0.0â¯â¤â¯xâ¯â¤â¯1.5) were sintered at high temperatures in a reduced oxygen atmosphere of 10â3â¯atm. While pure SrZnxFe(2-x)W-type solid solutions (0.0â¯â¤â¯xâ¯â¤â¯1.0) could be obtained, the second phase of ZnFe2O4 was obtained from the sample of xâ¯=â¯1.5, and the second phases of Sr2Zn2Fe12O22 and ZnFe2O4 was obtained from the sample of x = 2.0. With increasing x up to 1.0, Ms values were monotonously increased and the highest Ms value of 87.7 emu/g was obtainable from the sample of xâ¯=â¯1.0 sintered at 1250â¯Â°C. In addition, post-annealing heat treatments of samples for oxygenation at 300â¯Â°C in pure oxygen gas revealed that oxygen non-stoichiometry increased with increasing the sintering temperature, leading to the increase in Ms, unit cell volume, and electrical conductivity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 763, 30 September 2018, Pages 459-465
Journal: Journal of Alloys and Compounds - Volume 763, 30 September 2018, Pages 459-465
نویسندگان
Jae-Hyoung You, Sang-Im Yoo,