北京科技大学陈骏团队报道了通过调制Mn₃Pt的几何阻挫获得优异的压热效应。相关研究成果发表在2024年9月26日出版的《美国化学会杂志》。

气压热材料因其绿色高效的冷却性能，对下一代固态冷却设备具有巨大的前景。对低压驱动的气压热材料的深入了解，有望为压热制冷技术的广泛应用铺平道路。

该文中，研究人员们揭示了由Mn₃Pt中的几何阻挫调制的低压驱动的大气压热效应（BCE）。金属BCE材料中Mn₃Pt对压力的最高敏感性，导致其具有9.77 K 100^–1 MPa^–1的优异温度变化强度。

中子粉末衍射和第一性原理计算，指出了几何阻挫对调制异常BCE的双重影响，这不仅通过激发强烈的自旋涨落和磁矩引起了巨大的体积膨胀，而且提高了磁相变的灵敏度。研究建立了具有几何阻挫的磁体中几何阻挫的双重效应模型，将促进压热制冷装置的研究进展。

附：英文原文

Title: Excellent Barocaloric Effect by Modulating Geometrical Frustrations in Mn3Pt

Author: Feixiang Long, Yuzhu Song, Fuyang Tian, Zibing Yu, Hao Lu, Chuanrui Huo, Tianyu Li, Minjun Ai, Chaokun Guo, Huaican Chen, Wen Yin, Fengxia Hu, Xianran Xing, Jun Chen

Issue&Volume: September 26, 2024

Abstract: Barocaloric materials hold great promise for next-generation solid-state cooling devices because of their green and efficient cooling performance. The insights into low-pressure-driven barocaloric materials are expected to pave the way for the widespread application of barocaloric refrigeration technology. Here, we reveal the low-pressure-driven large barocaloric effect (BCE) modulated by geometrical frustrations in Mn3Pt. The highest sensitivity to pressure of Mn3Pt in metal BCE materials results in an excellent temperature-change strength of 9.77 K 100–1 MPa–1. Neutron powder diffraction and first-principles calculations point out the dual effect of geometrical frustration on modulating the unusual BCE, which not only induces giant volume expansion by inspiring strong spin fluctuation and magnetic moment but also enhances the sensitivity of magnetic phase transition. The model of the dual effect of geometrical frustration in magnets with geometrical frustration is established, which will promote the research progress of barocaloric refrigeration devices.

DOI: 10.1021/jacs.4c07342

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.4c07342