Novel caloric materials by mastering hysteresis: a material science approach

通过掌握滞后现象开发新型热量材料：一种材料科学方法

• 批准号: 227074547
• 负责人: Professor Dr. Oliver Gutfleisch
• 金额: --
• 依托单位: Fachgebiet Funktionale Materialien
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2017-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/227074547?language=en
• 关键词: Novel; caloric; materials; mastering; hysteresis

Solid-state cooling could be a radically different energy solution substituting conventional vapor compression refrigeration in the future. The most promising refrigerants do not only change their magnetism during magnetization but also their crystal structure. The development of efficient magnetic refrigerants is to maximize the structural contribution to the total entropy change. In this way, hysteresis is an unwanted side-effect that leads to losses and hinders the full use of caloric effects. In this project, we will develop a thorough understanding of the sources of both intrinsic and extrinsic magnetic hysteresis, so that a strategy to minimize hysteresis can be found. Furthermore, we will develop optimized, high-performance caloric materials that deliver a large caloric effect but in a reduced magnetic field (μ0H = 1 T) that would greatly reduce the cost of a magnetic refrigerator. Our strategy is to use the extensive experience of our work-group in magneto/barocaloric materials and devices, and our expertise in materials science, which covers novel synthesis, advanced characterization, and understanding of magnetic properties, microstructure, and thermodynamics. We focus on the most promising magnetic refrigerants, Heusler-type Ni-Mn-based, La(Fe,Si)13-based and Fe2P-type MnFeP(Ge,Si) operating near to ambient conditions.

固态冷却可能是一个完全不同的能源解决方案，取代传统的蒸汽压缩制冷在未来。最有前途的制冷剂不仅在磁化过程中改变其磁性，而且改变其晶体结构。高效磁制冷剂的发展是为了最大化结构对总熵变的贡献。以这种方式，滞后是一种不希望的副作用，导致损失并阻碍热量效应的充分利用。本项目将深入了解固有磁滞和非固有磁滞的来源，从而找到使磁滞最小化的对策。此外，还将开发优化的高性能发热材料，这种发热材料在降低磁场（μ 0 H = 1 T）的情况下提供大的发热效果，从而大大降低磁制冷机的成本。我们的战略是利用我们工作组在磁/压热材料和器件方面的丰富经验，以及我们在材料科学方面的专业知识，包括新颖的合成，先进的表征以及对磁性能，微观结构和热力学的理解。我们重点介绍了最有前途的磁制冷剂，Heusler型Ni-Mn基，La（Fe，Si）13基和Fe 2 P型MnFeP（Ge，Si）在接近环境条件下工作。