Engineering Light-Element Modified LaFe11.6Si1.4 Compounds Enables Tunable Giant Magnetocaloric Effect
F. Zhang (TU Delft - RST/Fundamental Aspects of Materials and Energy, City University of Hong Kong)
Z. Wu (TU Delft - RST/Fundamental Aspects of Materials and Energy)
Xiaofang Zhang (Songshan Lake Materials Laboratory, Dongguan )
Zhenduo Wu (City University of Hong Kong)
Jianrong Gao (Northeastern University)
Huaican Chen (Spallation Neutron Source Science Center, Dongguan , Chinese Academy of Sciences)
N.H. van Dijk (TU Delft - RST/Fundamental Aspects of Materials and Energy)
E.H. Brück (TU Delft - RST/Fundamental Aspects of Materials and Energy)
Yang Ren (City University of Hong Kong)
undefined More Authors (External organisation)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
Magnetocaloric refrigeration is one of the most promising next-generation solid-state caloric techniques to revolutionize the traditional air-compression technique. The La(Fe,Si)13-based materials are recognized as candidates with potential for practical applications. However, flexible strategies to improve the Curie temperature (TC) and further achieve the tunable giant magnetocaloric effect (GMCE) still need to be developed. Here, the systematic experimental investigation on a series of light elements (C, F, S) modified LaFe11.6Si1.4 compounds are presented. It is found that all modified samples exhibit a higher TC, with a negligible impact on the thermal hysteresis. The GMCE performance in C- and S-modified samples is significantly degraded, but the maximum magnetic entropy change |Δ sm| for the optimally doped F sample can be well maintained at 19.2 J kg−1 K−1 for a field change of 2 T. The preferential site occupancy of dopants is determined, and the microstructural observation and metastable atomic changes have also been analyzed. It is concluded that interstitial doping is more efficient to shift TC. The first-order transition can however not be maintained upon doping due to changes in the hybridization. These findings highlight the importance of the interplay between the lattice pressure effect and the covalent hybridization for this material family.
help_outline