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Ultrasensitive barocaloric material for room-temperature solid-state refrigeration
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 NH(4)I with reversible entropy changes of [Formula: see text] ∼71 J K(−1) kg(−1) around room temperature, associated with a structura...
Autores principales: | , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9051211/ https://www.ncbi.nlm.nih.gov/pubmed/35484158 http://dx.doi.org/10.1038/s41467-022-29997-9 |
Sumario: | 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 NH(4)I with reversible entropy changes of [Formula: see text] ∼71 J K(−1) kg(−1) around room temperature, associated with a structural phase transition. The phase transition temperature, T(t), varies dramatically with pressure at a rate of dT(t)/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 [Formula: see text] ∼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 T(t). This work is expected to advance the practical application of barocaloric refrigeration. |
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