کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1593947 1515678 2009 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
New complex magnetic materials for an application in Ericsson refrigerator
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
New complex magnetic materials for an application in Ericsson refrigerator
چکیده انگلیسی

In this paper, a new complex magnetic materials La0.70Ca0.15Sr0.15Mn1−xFexO3 (x=x= 0.000, 0.025, 0.050, 0.075 and 0.100), suitable for the Ericsson cycle, has been investigated. For these materials, the effect of Fe doping can be attributed to a combination of doping disorder, Fe–Mn super exchange interactions and a site-percolation mechanism, which suppress the metallic conduction and ferromagnetism. We have found that these compounds crystallize in the rhombohedral structure with the R3¯c space group. We have also verified that the substitution of the manganese with iron leads to an important decrease of the Curie temperature TCTC from 335 to 225 K for 0%–10% of Fe. The magnetocaloric study exposes a quite large value of the magnetic entropy change, which decreases when increasing Fe concentration. For an applied magnetic field of 2 T, the Relative Cooling Power (RCP) values are found to vary between 80 and 125 J/kg. As a result, the studied compounds could be considered as potential material for magnetic Ericsson refrigeration by using complex magnetocaloric compounds.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Communications - Volume 149, Issues 25–26, July 2009, Pages 969–972
نویسندگان
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