Phase Transitions and Magnetocaloric Effect in Mn3Cu0.89Nd0.96^

Published

August 1, 2014

Author(s)

Jun Yan, Ying Sun, Hui Wu, Qingzhen Huang, Cong Wang, Zaixing Shi, Sihao Deng, Kewen Shi, Huiqing Lu, Lihua Chu

Abstract

We report the large magnetic entropy change observed in the antiperovskite Mn₃Cu_0.89N_{0.96. Based in the heat flow peak measured by differential scanning calorimeter (DSC), the total entropy change according to the structural transition (tetragonal to cubic) was calculated to be 60 J/kg K while magnetic entropy change accounts for 22.5% of the total entropy under a 5 Tesla (T) magnetic field at 145 K. To clarify the origin of the magnetic entropy change, we managed to control the structure transition using a magnetic field. It was found that the magnetic entropy change originates from the transformation from antiferromagnetic (AFM) to ferromagnetic (FM) as well as the phase transition from cubic to tetragonal under the magnetic field. In the tetragonal phase, magnetic field can drive the AFM component to transform gradually to FM component. The magnetic field can also change the phase fraction in the tetragonal and cubic two-phase coexistence region, a similar behavior to that induced by temperature. In the current system, there is only 5.4% cubic phase transforming to the tetragonal phase at 5 T, indicating there are still much latent entropy in Mn}d3^Cu_0.89N^d0.96.

Citation

Acta Materialia

Volume

74

Pub Type

Journals

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Keywords

magnetocaloric effect, entropy, magnetic field, phase transition

Citation

Yan, J. , Sun, Y. , Wu, H. , Huang, Q. , Wang, C. , Shi, Z. , Deng, S. , Shi, K. , Lu, H. and Chu, L. (2014), Phase Transitions and Magnetocaloric Effect in Mn₃Cu_0.89Nd0.96^, Acta Materialia, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=915998 (Accessed April 18, 2024)