Large Barocaloric Effect with High Pressure-Driving Efficiency in a Hexagonal MnNi0.77Fe0.23Ge Alloy
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Chinese Phys Lett-Large Barocaloric Effect with High Pressure-Driving Efficiency in a Hexagonal MnNi$_{0.77}$Fe$_{0.23}$Ge Alloy.pdf
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Accepted manuscript
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ArticleKAUST Department
Material Science and Engineering ProgramPhysical Science and Engineering (PSE) Division
Date
2020-07-14Online Publication Date
2020-07-14Print Publication Date
2020-07Embargo End Date
2021-07-14Submitted Date
2020-04-22Permanent link to this record
http://hdl.handle.net/10754/664541
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The hydrostatic pressure is expected to be an effective knob to tune the magnetostructural phase transitions of hexagonal MM'X alloys (M and M' denote transition metals and X represents main group elements). We perform magnetization measurements under hydrostatic pressure on an MM'X martensitic MnNi20.77Fe0.23Ge alloy. The magnetostructural transition temperature can be efficiently tuned to lower temperatures by applying moderate pressures, with a giant shift rate of -151 K/GPa. A temperature span of 30 K is obtained under the pressure, within which a large magnetic entropy change of -23 J⋅kg-1K-1 in a field change of 5 T is induced by the mechanical energy gain due to the large volume change. Meanwhile, a decoupling of structural and magnetic transitions is observed at low temperatures when the martensitic transition temperature is lower than the Curie temperature. These results show a multi-parameter tunable caloric effect that benefits the solid-state cooling.Citation
Zeng, Q., Shen, J., Liu, E., Xi, X., Wang, W., Wu, G., & Zhang, X. (2020). Large Barocaloric Effect with High Pressure-Driving Efficiency in a Hexagonal MnNi0.77Fe0.23Ge Alloy. Chinese Physics Letters, 37(7), 076101. doi:10.1088/0256-307x/37/7/076101Sponsors
Supported by the National Natural Science Foundation of China (Grant No. 51722106), the National Key R&D Program of China (Grant No. 2019YFA0704904), Users with Excellence Program of Hefei Science Center CAS (Grant No. 2019HSC-UE009), and Fujian Institute of Innovation, Chinese Academy of Sciences.Publisher
IOP PublishingJournal
Chinese Physics LettersarXiv
2106.02903Additional Links
https://iopscience.iop.org/article/10.1088/0256-307X/37/7/076101ae974a485f413a2113503eed53cd6c53
10.1088/0256-307X/37/7/076101