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Ultrasensitive barocaloric material for room-temperature solid-state refrigeration
- Source :
- Nature Communications 13, 2293 (2022)
- Publication Year :
- 2021
-
Abstract
- Solid-state refrigeration based on caloric effects is an energetically efficient and environmentally friendly technology, which is deemed as a potential alternative to the conventional vapor-compression technology. One of the greatest obstacles to the real application is the huge driving fields. Here, we report a giant barocaloric effect in inorganic NH4I with maximum entropy changes of {\Delta}S_BCE^max ~89 J K-1 kg-1 around room temperature, associated with the orientationally order-disorder phase transition. The phase transition temperature, Tt, varies dramatically with pressure in a rate of dTt/dP ~0.81 K MPa-1, which leads to a very much small saturation driving pressure of {\Delta}P ~20 MPa, an unprecedentedly large caloric strength of |{\Delta}S_BCE^max/{\Delta}P| ~4.45 J K-1 kg-1 MPa-1, as well as a broad temperature window of ~68 K under an 80 MPa driving pressure. Comprehensive characterization of the crystal structure and dynamics by neutron scattering measurements reveals a strong reorientation-vibration coupling that is responsible for the large pressure sensitivity of Tt. This work is expected to advance the practical application of barocaloric refrigeration.<br />Comment: 18pages, 5 figures
- Subjects :
- Condensed Matter - Materials Science
Subjects
Details
- Database :
- arXiv
- Journal :
- Nature Communications 13, 2293 (2022)
- Publication Type :
- Report
- Accession number :
- edsarx.2110.11563
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1038/s41467-022-29997-9