Dynamical Effects of the Martensitic Transition in Magnetocaloric Heusler Alloys from Direct ΔTad Measurements under Different Magnetic-Field-Sweep Rates

被引：78

作者：

Gottschall, T. ^{[1
]}

Skokov, K. P. ^{[1
]}

Scheibel, F. ^{[2
,3
]}

Acet, M. ^{[2
,3
]}

Zavareh, M. Ghorbani ^{[4
,5
]}

Skourski, Y. ^{[4
]}

Wosnitza, J. ^{[4
,5
]}

Farle, M. ^{[2
,3
]}

Gutfleisch, O. ^{[1
]}

机构：

[1] Tech Univ Darmstadt, Inst Mat Wissensch, Alarich Weiss Str 16, D-64287 Darmstadt, Germany

[2] Univ Duisburg Essen, Fak Phys, D-47057 Duisburg, Germany

[3] Univ Duisburg Essen, CENIDE, D-47057 Duisburg, Germany

[4] Helmholtz Zentrum Dresden Rossendorf, Dresden High Magnet Field Lab HLD EMFL, D-01328 Dresden, Germany

[5] Tech Univ Dresden, Inst Festkorperphys, D-01062 Dresden, Germany

来源：

PHYSICAL REVIEW APPLIED | 2016年 / 5卷 / 02期

关键词：

Cobalt alloys - Energy efficiency - Indium alloys - Magnetocaloric effects - Manganese alloys - Nucleation - Martensitic transformations - Gallium alloys - Martensite - Nickel alloys - Ternary alloys;

D O I：

10.1103/PhysRevApplied.5.024013

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Large magnetocaloric effects can be obtained in Ni-Mn-based Heusler alloys due to the magnetostructural transition between martensite and austenite. This phase transformation proceeds via nucleation and growth. By direct measurements of the adiabatic temperature change Delta T-ad using different magnetic-field-sweeping rates from 0.01 up to 1500 T s(-1), we study the dynamic behavior of the two Heusler compounds Ni50Mn35In15 and Ni45Mn37In13Co5 transforming near room temperature. From these experiments, we conclude that the nucleation process is rather slow in contrast to the relatively fast movement of the phase boundary between martensite and austenite. This is a limiting factor for cooling concepts operating at frequencies beyond 100 Hz. However, the dynamic effects of the transition are negligible in field rates typically used in magnetic refrigeration. These findings are essential considering the suitability of Heusler compounds for energy-efficient solid-state cooling.

引用

页数：8

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