کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8156852 | 1524853 | 2014 | 14 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The system study of 1:13 phase formation, the magnetic transition adjustment, and magnetocaloric property in La(Fe,Co)13âxSix alloys
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
The effects of Co on the formation of NaZn13-type phase in as-cast and annealed LaFe16âxCoxSi1.4 and LaFe11.6Si1.4âxCox alloys have been investigated systematically by XRD, SEM, and EDS, respectively. In LaFe11.6Si1.4âxCox alloys, the introduction of Co will hamper the formation of 1:13 and LaFeSi phases, and help the formation of αof (Co, Si) solid solution, so there is almost only α-Fe(Co, Si) solid solution when x reaches 0.7 in as-cast and annealed LaFe11.6Si1.4âxCox alloys. Although the amounts of 1:13 phase increases when x reaches 0.7 in as-cast LaFe16âxCoxSi1.4 alloys, there is a small amount of α-Fe in LaFe11.6âxCoxSi1.4 alloys annealed at 1523 K (5 h), which indicates that the annealing time for obtaining a 1:13 single-phase cannot be shortened in our high-temperature and short-time annealing. The studies on the magnetic properties show that the Curie temperature TC goes up from 207 K to 285 K with increase of Co content from x=0.1 to 0.8. The introduction of Co element weakens the first order magnetic phase transition, which results in the change of magnetic transition type from first to second order at about x=0.3-0.5. At the same time, it has effects on the phase transition temperature interval and magnetic filed interval, and the changing rate of magnetic entropy change dependence on the Co content in LaFe16âxCoxSi1.4 alloys. The maximum entropy values of LaFe11.6âxCoxSi1.4 alloys decrease with the increase of Co content, but the relative cooling power does not decrease, the reason of which is that the phase transition temperature interval increases and the first order phase transition character decreases, and the effective refrigeration temperature range becomes big, which is useful to the application of magnetic refrigeration material.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 368, November 2014, Pages 155-168
Journal: Journal of Magnetism and Magnetic Materials - Volume 368, November 2014, Pages 155-168
نویسندگان
Xiang Chen, Yungui Chen, Yongbo Tang, Dingquan Xiao,