Barocaloric effect associated with magneto-structural transformation studied by an effectively indirect method for the Nilass="a-plus-plus">58.3Mnlass="a-plus-plus">17.1Galass="a-plus-plus">24.6 Heusler alloy
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- 作者：X. J. He ; K. Xu ; S. X. Wei ; Y. L. Zhang ; Z. Li ; C. Jing
- 刊名：Journal of Materials Science
- 出版年：2017
- 出版时间：March 2017
- 年：2017
- 卷：52
- 期：5
- 页码：2915-2923
- 全文大小：<len>
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics;
- 出版者：Springer US
- ISSN：1573-4803
- 卷排序：52
文摘
In the present work, we report the dependence of magnetization on hydrostatic pressure for the non-stoichiometric Ni58.3Mn17.1Ga24.6 alloy, which undergoes the transformation from a paramagnetic austenite to a ferromagnetic martensite near room temperature. It is found that the application of pressure can push the martensitic transformation (MT) to a higher temperature at a rate of 4 K GPa−1. Considering the change of phase fraction under the isothermal condition caused by pressure-induced MT, we develop an indirect method based on magnetic data measured under various pressures to determine the barocaloric effect (BCE) for the studied alloy. When the change of the applied hydrostatic pressure reaches 1.05 GPa, the maximum isothermal entropy change \( \Delta S_{\text{T}} \) is calculated to be about −13.6 J kg−1 K−1, yielding a value of 2.8 K for the adiabatic temperature change \( \Delta T_{\text{ad}} \) near room temperature. These values are comparable to those obtained in many alloys of the same series by using superconducting magnets. Such a considerable BCE can be attributed to the fact that the MT can be driven more easily by the pressure-induced crystallographic change than by the magnetic field-induced spin–lattice coupling.