Ultrasensitive barocaloric material for room-temperature solid-state refrigeration

Qingyong Ren, Ji Qi, Dehong Yu, Zhe Zhang, Ruiqi Song, Wenli Song, Bao Yuan, Tianhao Wang, Weijun Ren, Zhidong Zhang, Xin Tong () and Bing Li ()
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Qingyong Ren: Chinese Academy of Sciences
Ji Qi: Institute of Metal Research, Chinese Academy of Sciences
Dehong Yu: Australian Nuclear Science and Technology Organisation
Zhe Zhang: Institute of Metal Research, Chinese Academy of Sciences
Ruiqi Song: Institute of Metal Research, Chinese Academy of Sciences
Wenli Song: Chinese Academy of Sciences
Bao Yuan: Chinese Academy of Sciences
Tianhao Wang: Chinese Academy of Sciences
Weijun Ren: Institute of Metal Research, Chinese Academy of Sciences
Zhidong Zhang: Institute of Metal Research, Chinese Academy of Sciences
Xin Tong: Chinese Academy of Sciences
Bing Li: Institute of Metal Research, Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract One of the greatest obstacles to the real application of solid-state refrigeration is the huge driving fields. Here, we report a giant barocaloric effect in inorganic NH4I with reversible entropy changes of $$\Delta {S}_{{P}_{0}\to P}^{{{\max }}}$$ Δ S P 0 → P max ∼71 J K−1 kg−1 around room temperature, associated with a structural phase transition. The phase transition temperature, Tt, varies dramatically with pressure at a rate of dTt/dP ∼0.79 K MPa−1, which leads to a very small saturation driving pressure of ΔP ∼40 MPa, an extremely large barocaloric strength of $$\left|\Delta {S}_{{P}_{0}\to P}^{{{\max }}}/\Delta P\right|$$ Δ S P 0 → P max / Δ P ∼1.78 J K−1 kg−1 MPa−1, as well as a broad temperature span of ∼41 K under 80 MPa. Comprehensive characterizations of the crystal structures and atomic dynamics by neutron scattering reveal that a strong reorientation-vibration coupling is responsible for the large pressure sensitivity of Tt. This work is expected to advance the practical application of barocaloric refrigeration.

Date: 2022
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DOI: 10.1038/s41467-022-29997-9

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