The Effect of Hydrostatic Pressure on the Martensitic Transformation and Magnetocaloric Effect of MnNi0.88GeV0.12 Alloy,Physica Status Solidi (B) - Basic Solid State Physics

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The Effect of Hydrostatic Pressure on the Martensitic Transformation and Magnetocaloric Effect of MnNi0.88GeV0.12 Alloy
Physica Status Solidi (B) - Basic Solid State Physics ( IF 1.5 ) Pub Date : 2022-07-27 , DOI: 10.1002/pssb.202200135
Chen Li ₁ , Guoliang Ma ₁ , Mengru Chen ₁ , Shuotong Zong ₁ , Yan Zhang ₁ , Shulei Zhao ₁ , Fenghua Chen ₁ , YuanYuan Gong ₂

Affiliation

The effect of hydrostatic pressure on the martensitic transformation and magnetocaloric properties of MnNi_0.88GeV_0.12 alloy is studied in detail. X-ray diffraction at room temperature shows that the alloy has a single hexagonal Ni₂In-type structure. The phase transition temperature moves to the low-temperature region with the increase in hydrostatic pressure. Under the external magnetic field of 15 kOe, the hydrostatic pressure driving rates

◂+▸ d T_{M} / d P

and

◂+▸ d T_{A} / d P

are 60.25 and 65.25 K GPa⁻¹, respectively, which indicate that the applied pressure expands the working temperature range of magnetic refrigeration. A magnetic entropy change ΔS of −4.8 J kg⁻¹ K⁻¹ is obtained in the external magnetic field of 15 kOe under ambient pressure. The peak value of |ΔS| is increased to 5.6 J kg⁻¹ K⁻¹ under hydrostatic pressure, which is closely related to the structural change of the alloy.

中文翻译：

静水压力对MnNi0.88GeV0.12合金马氏体相变及磁热效应的影响

详细研究了静水压力对MnNi _0.88 GeV _0.12合金马氏体转变和磁热性能的影响。室温X射线衍射表明该合金具有单一的六方Ni ₂ In型结构。随着静水压力的增加，相变温度向低温区移动。在 15 kOe 的外部磁场下，静水压力驱动率