کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7881659 1509602 2014 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Phase transitions and magnetocaloric effect in Mn3Cu0.89N0.96
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Phase transitions and magnetocaloric effect in Mn3Cu0.89N0.96
چکیده انگلیسی
We report a large magnetic entropy change observed in the antiperovskite Mn3Cu0.89N0.96. Based on the heat flow peak measured by differential scanning calorimetry, the total entropy change according to the structural transition (tetragonal to cubic) was calculated to be ∼60 J kg-1 K-1 while the magnetic entropy change accounts for ∼22.5% of the total entropy under a 50 kOe magnetic field at 145 K. To clarify the origin of the magnetic entropy change, we managed to control the structure transition using a magnetic field. It was found that the magnetic entropy change originates from the transformation from antiferromagnetic (AFM) to ferromagnetic (FM) as well as from the phase transition from cubic to tetragonal under the magnetic field. In the tetragonal phase, a magnetic field can drive the AFM component to transform gradually to the FM component. The magnetic field can also change the phase fraction in the tetragonal and cubic two-phase coexistence region, a similar behavior to that induced by temperature. In the current system, only 5.4% of the cubic phase transforms to the tetragonal phase at 5 Tesla (T), indicating there is still much latent entropy in Mn3Cu0.89N0.96.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 74, 1 August 2014, Pages 58-65
نویسندگان
, , , , , , , , , ,