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arXiv · 1408.5579

A coupling of martensitic and metamagnetic transitions with collective magneto-volume and table-like magnetocaloric effects

E. K. Liu·Z. Y. Wei·Y. Li·G. D. Liu·H. Z. Luo·W. H. Wang·H. W. Zhang·G. H. Wu
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Abstract

A coupling of the first-order paramagnetic-to-induced-ferromagnetic martensitic and the second-order antiferromagnetic-to-ferromagnetic metamagnetic transitions was found in MnNi0.8Fe0.2Ge alloy. Based on the coupling, a magneto-volume effect driven by the martensitic transition and a table-like magnetocaloric effect generated by the successive magnetic phase transitions arise collectively. By using the magneto-volume effect, the internal pressure stress in the volume-expansion martensitic transition was determined at 350 MPa. The magnetocaloric effect, with a wide working temperature range of 26 K around room temperature, shows a small hysteresis loss (5 J/kg) and a large net refrigerant capacity (157 J/kg).

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E. K. Liu, Z. Y. Wei, Y. Li, G. D. Liu, H. Z. Luo, W. H. Wang, H. W. Zhang, G. H. Wu. 2014-08-24. A coupling of martensitic and metamagnetic transitions with collective magneto-volume and table-like magnetocaloric effects. https://doi.org/10.1063/1.4892167

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