Analysis of the Magnetocaloric Effect in Heusler Alloys: Study of Ni50CoMn36Sn13 by Calorimetric Techniques

Entropy

Elias Palacios³  Juan Bartolomé³  Gaofeng Wang³  Ramon Burriel³  Konstantin Skokov⁴  Sergey Taskaev²  Vladimir Khovaylo¹ 

[1] National University of Science and Technology “MISiS”, Moscow 119049, Russia; E-Mail:;Faculty of Physics, Chelyabinsk State University, Chelyabinsk 454001, Russia; E-Mail:;Instituto de Ciencia de Materiales de Aragón (ICMA) and Dep. de Física de la Materia Condensada, CSIC - University of Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain; E-Mails:;Faculty of Physics, Tver State University, Tver 170000, Russia; E-Mail:

关键词: magnetocaloric effect;    Heusler alloys;    heat capacity;    thermal hysteresis;   

DOI  :  10.3390/e17031236

来源: mdpi

【 摘 要 】

Direct determinations of the isothermal entropy increment, −ΔS_T, in the Heusler alloy Ni₅₀CoMn₃₆Sn₁₃ on demagnetization gave positive values, corresponding to a normal magnetocaloric effect. These values contradict the results derived from heat-capacity measurements and also previous results obtained from magnetization measurements, which indicated an inverse magnetocaloric effect, but showing different values depending on the technique employed. The puzzle is solved, and the apparent incompatibilities are quantitatively explained considering the hysteresis, the width of the martensitic transition and the detailed protocol followed to obtain each datum. The results show that these factors should be analyzed in detail when dealing with Heusler alloys.

【 授权许可】

CC BY   
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