High-performance solid-state cooling materials: Balancing magnetocaloric and non-magnetic properties in dual phase La-Fe-Si. (15th February 2017)

• Record Type: Journal Article
• Authors: Shao, Yanyan; Liu, Jian; Zhang, Mingxiao; Yan, Aru; Skokov, Konstantin P.; Karpenkov, Dmitriy Yu; Gutfleisch, Oliver
• Is Part Of: Acta materialia. Volume 125(2017)
• Page Start: 506
• Page End: 512
• Publication Date: 2017-02-15
• Subjects: La-Fe-Si-H -- Magnetocaloric effect -- Adiabatic temperature change -- Thermal conductivity; Materials -- Periodicals; Materials science -- Periodicals; Materials -- Mechanical properties -- Periodicals; Metallurgy -- Periodicals; Chemistry, Inorganic -- Periodicals; 620.112
• DOI: 10.1016/j.actamat.2016.12.014
• Languages: English
• ISSNs: 1359-6454

Abstract

Abstract: La(Fe, Si)13 H-based materials are considered to be one of the most promising room-temperature magnetic refrigerants. The intrinsic brittleness and relatively low thermal conductivity in La-Fe-Si-H alloys, however, have severely hindered its preparation, shaping and application. To solve this long-standing problem, in this work we propose a novel approach to fabricate stable La-Fe-Si-H blocks and plates by adding extra α-Fe as a reinforcing phase to enhance mechanical integrity. Much better bending strength compared to that in the stoichiometric composition has been observed in our dual phase La-Fe-Si-H magnetic refrigerants. Such novel Fe-rich plates can be exposed to 10 5 magnetic field cycles without losing mechanical integrity. In addition, a large and reproducible Δ T ad of 5.4 K in 1.93 T and a thermal conductivity of 6 W/mK at room temperature have been obtained. Graphical abstract: In the dual phase La-Fe-Si-H alloys, materials can be fabricated to the block shape, where the toughening α-Fe guarantees the mechanical integrity and offers significantly enhanced thermal conductivity. Image 1