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<p>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 KPF<sub>6</sub> 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.</p>

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All-temperature barocaloric effects at pressure-induced phase transitions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年8月19日

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  • 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,
  • Bing Li

摘要

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.