کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8154931 | 1524802 | 2016 | 30 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Magnetocaloric effect in Mn2-pyrazole-[Nb(CN)8] molecular magnet by relaxation calorimetry
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Magnetocaloric effect in Mn2-pyrazole-[Nb(CN)8] molecular magnet by relaxation calorimetry Magnetocaloric effect in Mn2-pyrazole-[Nb(CN)8] molecular magnet by relaxation calorimetry](/preview/png/8154931.png)
چکیده انگلیسی
Magnetocaloric effect in {[Mn(pyrazole)4]2[Nb(CN)8]·4 H2O}n molecular magnet is reported. It crystallizes in tetragonal I41/a space group. The compound exhibits a phase transition to a long range magnetically ordered state at TNâ22.8K. Temperature dependences of the magnetic entropy change ÎSM as well as the adiabatic temperature change ÎTad due to applied field change μ0ÎH in the range of 0.1-9 T have been inferred from the relaxation calorimetry measurements. A systematic approximate approach has been used to determine the lattice contribution to the heat capacity. The maximum value of ÎSM for μ0ÎH=5T is 6.83 J molâ1 Kâ1 (6.65 J kgâ1 Kâ1) at 24.3 K. The corresponding maximum value of ÎTad is 1.4 K at 23.8 K. The temperature dependence of the exponent n characterizing the field dependence of ÎSM has been estimated. It attains the value of 0.64 at the transition temperature, which is consistent with the 3D Heisenberg universality class. A hitherto unobserved two-peak structure has been revealed in the temperature dependence of ÎTad.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Magnetism and Magnetic Materials - Volume 419, 1 December 2016, Pages 435-441
Journal: Journal of Magnetism and Magnetic Materials - Volume 419, 1 December 2016, Pages 435-441
نویسندگان
R. PeÅka, M. Gajewski, Y. Miyazaki, S. Yamashita, Y. Nakazawa, M. Fitta, D. Pinkowicz, B. Sieklucka,