Giant room-temperature barocaloric effect at the electronic phase transition in Ni1−xFexS. Issue 10 (30th July 2020)

• Record Type: Journal Article
• Authors: Lin, Jianchao; Tong, Peng; Zhang, Xuekai; Wang, Zichen; Zhang, Zhao; Li, Bing; Zhong, Guohua; Chen, Jie; Wu, Yaoda; Lu, Huaile; He, Lunhua; Bai, Bo; Ling, Langsheng; Song, Wenhai; Zhang, Zhidong; Sun, Yuping
• Is Part Of: Materials horizons. Volume 7:Issue 10(2020)
• Page Start: 2690
• Page End: 2695
• Publication Date: 2020-07-30
• Subjects: Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9mh01976f
• Languages: English
• ISSNs: 2051-6347

Abstract

Abstract : The electronic entropy enhanced giant barocaloric effect along with high thermal conductivity in hexagonal Ni1− x Fe x S. Abstract : Barocaloric (BC) materials are a type of promising solid-state refrigerant that can be used in future refrigerators. Besides the routine pressure-driven lattice entropy change, spin or polar degrees of freedom often make considerable contributions. Relatively, little attention has been paid to the electronic contribution. Here we demonstrate a sizable electronic entropy change under pressure in hexagonal Ni1− x Fe x S due to the remarkable modification of its electronic structure. Accordingly, the total entropy change reaches 52.8 J kg −1 K −1 under only 100 MPa, which places Ni1− x Fe x S among the giant BC materials. Again, because of the electronic contribution, the thermal conductivity of Ni1− x Fe x S is higher than the reported values of other giant BC materials, which can boost the cooling efficiency. Our work would inspire the study of the giant BC effect with good thermal conductance in a wide range of electronic phase transition materials.