Magnetocaloric effect and H gradient in bulk La(Fe,Si)13Hy magnetic refrigerants obtained by HDSH

Abstract

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Effect of Composition on the Phase Structure and Magnetic Properties of Ball-Milled LaFe11.71-xMnxSi1.29H1.6 Magnetocaloric Powders

“…In 1997, Pecharsky et al observed the MCE in Gd 5 Ge 2 Si 2 compounds [11,12], which prompted future research efforts towards room temperature magnetic refrigeration applications. Due to the reversible nature of the MCE, magnetic refrigeration has a great potential for high thermodynamic cycle efficiency [13]. Furthermore, it is expected that MCE refrigeration will help reduce the use of hazardous Freon-based gases that are used in conventional refrigeration systems [14].…”

“…La-based powders have also been proposed as viable candidates for magnetic refrigeration applications [18,19]. In particular, La(Fe x Si 1-x ) 13 compounds can form intermetallic phases that exhibit good magnetocaloric properties [19,20]. However, these compounds have been reported to exhibit Curie temperatures (T c ) ranging from −93 to −43 • C [21], which are significantly below the conditions necessary for magnetic cooling at room temperature [13].…”

“…In particular, La(Fe x Si 1-x ) 13 compounds can form intermetallic phases that exhibit good magnetocaloric properties [19,20]. However, these compounds have been reported to exhibit Curie temperatures (T c ) ranging from −93 to −43 • C [21], which are significantly below the conditions necessary for magnetic cooling at room temperature [13]. One method that has been used to raise T c in these types of MCMs is to increase the lattice parameter by inserting hydrogen into interstitial sites.…”

Peritectic Solidification Path of the La(Fe,Si)13 Phase in Dual-Phase Directionally Solidified La-Fe-Si Magnetocaloric Alloys

“…Other novel methods have been used, such as melt-spun to refine the prime a-Fe phase and powder metallurgy (HDSH) to insert H atoms; however, the alloys are prepared in powder and/or ribbon form. [17][18][19] Directional solidification has been used in the production of peritectic functional alloys and can tailor the microstructure, morphology, and oriented crystal growth, which has been reported for magnetic alloys such as Nd-Fe-B alloys. [20] Additionally, it can influence the solidification path by controlling the temperature gradient and growth rate, as reported in our previous research of dual-phase (c phase) Ni-Mn-In alloys.…”

Magnetocaloric Properties of Mn1.1Fe0.9P0.5As0.5−xGex (0 ≤ x ≤ 0.1) Compounds

“…Among the different types of intermetallic compounds, two groups exhibiting magnetoelastic ferro to paramagnetic state transition are the most prospective. The first one, an La(Fe,Si) 13 group of compounds, is being optimized by introducing cobalt and manganese into the composition and by performing hydrogenation [1,2,3,4,5,6]. All of these procedures are aimed toward shifting the Curie point to the desired room temperature.…”