Journal
MATERIALS TODAY ENERGY
Volume 20, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mtener.2020.100621
Keywords
High entropy alloys; Phase segregation; Nanoparticles; Inter-particle interaction; Magnetic clusters; SSG; SPM; SFM
Funding
- Royal Society Mid-Career Leverhulme Trust Fellowship scheme [SRF\R1\180020]
- Leverhulme Trust [RPG-2018-324]
Ask authors/readers for more resources
The study investigated the effect of phase separation on the magnetic and magneto-caloric properties of the CoFeNi0.5Cr0.5-Al-x system, finding that collaborative behavior among FeCr-rich segregated nanoparticles increases saturation magnetisation while Curie temperature is controlled by the amount of added Al. The CoFeNi0.5Cr0.5-Al-1.0 sample exhibited the highest Ms and refrigerant capacity, indicating that enhanced magnetic and refrigerant capacity can be achieved through phase separation and nanoparticle clustering.
We have studied the effect of phase separation on the magnetic and magneto-caloric properties of the CoFeNi0.5Cr0.5-Al-x (x = 0.0, 1.0 and, 1.5) system. Results show that a collaborative behaviour among FeCr-rich segregated nanoparticles (NPs) increases the saturation magnetisation (Ms) while the Curie temperature (T-c) is controlled by the amount of added Al. With a strong ferromagnetic coupling between segregated FeCr-NPs, the CoFeNi0.5Cr0.5-Al-1.0 sample shows the highest Ms (100 Am-2 kg(-1)) with an increase of 61% over the Al-free CoFeNi0.5Cr0.5 sample. It is argued that as the ferromagnetic interaction increases in a degenerated superspin-glass-like state of the NPs the field induced phase transition is broadened while the magnetic entropy decreases. In turn, the CoFeNi0.5Cr0.5-Al-1.0 sample shows the highest refrigerant capacity (17.1 J kg(-1) at mu(0)Delta H = 1.0 T), and the smallest measured magnetic entropy change (Delta S-m(peak) = 0.22 J kg(-1) K-1). We found that the enhanced magnetic and refrigerant capacity by mean of phase separation and NPs clustering are among the highest reported for the multicomponent alloys being investigated for energy applications in the high temperature range. (C) 2020 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available