All-temperature barocaloric effects at pressure-induced phase transitions

Xueting Zhao, Zhao Zhang, Takanori Hattori, Jiantao Wang, Lingli Li, Yating Jia, Wanwu Li, Jianing Xue, Xiaoyan Fan, Ruiqi Song, Jinlong Zhu, Peitao Liu (), Xing-Qiu Chen, Zhidong Zhang and Bing Li ()
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Xueting Zhao: 72 Wenhua Road
Zhao Zhang: 72 Wenhua Road
Takanori Hattori: Naka
Jiantao Wang: 72 Wenhua Road
Lingli Li: 72 Wenhua Road
Yating Jia: Southern University of Science and Technology
Wanwu Li: 72 Wenhua Road
Jianing Xue: 72 Wenhua Road
Xiaoyan Fan: 72 Wenhua Road
Ruiqi Song: 72 Wenhua Road
Jinlong Zhu: Southern University of Science and Technology
Peitao Liu: 72 Wenhua Road
Xing-Qiu Chen: 72 Wenhua Road
Zhidong Zhang: 72 Wenhua Road
Bing Li: 72 Wenhua Road

Nature Communications, 2025, vol. 16, issue 1, 1-8

Abstract: Abstract Caloric effects, which underpin one solution to solid-state refrigeration technologies, usually occur in the vicinity of solid-state phase transitions with a limited refrigeration temperature span. Here, we introduce and realize an unprecedented concept ‒ all-temperature barocaloric effect, i.e., a remarkable barocaloric effect in KPF6 across an exceptionally wide temperature span, from 77.5 to 300 K and potentially down to 4 K, covering typical room temperature, liquid nitrogen, liquid hydrogen, and liquid helium refrigeration regions. The directly measured barocaloric adiabatic temperature change reaches 12 K at room temperature and 2.5 K at 77.5 K upon the release of a 250 MPa pressure. This effect is attributed to a persistent phase transition to a rhombohedral high-pressure phase, as evidenced by pressure-dependent neutron powder diffraction, Raman scattering analyses, and first-principles calculations. We depict the thermodynamic energy landscape to account for the structural instability. This unique all-temperature barocaloric effect presents a novel approach to highly applicable solid-state refrigeration technology, transcending the conventional multi-stage scenario.

Date: 2025
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DOI: 10.1038/s41467-025-63068-z

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