Study on the Hydrogenation Kinetics, Properties, and Stability of LaFe11.5Si1.5 and LaFe11.4Si1.6 Compounds

A Short Review on the Evolution of Magnetocaloric La(Fe,Si)13 and Its Fabrication through Melt Spinning

“…The effects of ball milling on the annealing time and magnetic properties of the LaFe 13−x Si x compound were investigated in a study carried out by Phejar et al The Curie transition temperature of annealed, ball-milled samples is identical to that of bulk alloys and rises proportionally with the amount of silicon present in the sample. 5,24 The magnetic entropy variation of the ball-milled LaFe 11.4 Si 1.6 compound was found to be significantly greater than that of the bulk alloy, coming in at 16.5 J/(kg K) when subjected to a shift in magnetic field strength of 0−2 T. Hydrogen absorption in La(Fe,Si) 13 110 causes T c to rise from 190 to 330 K, whereas partial replacements of Ce and Mn cause the temperature to fall below 190 K. 45 Phejar et al successfully synthesized La(Fe,Si) 13 by utilizing both the arc melting process and the ball milling method. 5 Additionally, they discovered that the annealing time and temperature might be decreased when using the ball milling process as opposed to the arc melting approach.…”

“…The field-induced magnetic transition near T c is likewise eliminated when La is replaced with another rare earth element, which changes the transition from first order to second order. 9,110 The ball milling (BM) method is a significant component of the solid-state alloying process and is well-known for its adaptability in the production of metastable systems. 24 By employing this method of synthesis, a broad range of equilibrium and nonequilibrium alloys have been created, with the process beginning with the blending of elemental powders or particles that have already been alloyed.…”

“…The rare earth α-Fe exchange coupling largely depends on the kind of rare earth, and magnetic rare earth elements have been substituted at the La site to adjust the phase transition temperature and lower the critical field of the 3d-metamagnetic transition. The field-induced magnetic transition near T c is likewise eliminated when La is replaced with another rare earth element, which changes the transition from first order to second order. , …”

“…However, up to now, this approach has not been applicable to the synthesis of La­(Fe,Si) 13 compounds beginning with raw metal powders as the starting material. The effects of ball milling on the annealing time and magnetic properties of the LaFe 13– x Si x compound were investigated in a study carried out by Phejar et al The Curie transition temperature of annealed, ball-milled samples is identical to that of bulk alloys and rises proportionally with the amount of silicon present in the sample. , The magnetic entropy variation of the ball-milled LaFe 11.4 Si 1.6 compound was found to be significantly greater than that of the bulk alloy, coming in at 16.5 J/(kg K) when subjected to a shift in magnetic field strength of 0–2 T. Hydrogen absorption in La­(Fe,Si) 13 causes T c to rise from 190 to 330 K, whereas partial replacements of Ce and Mn cause the temperature to fall below 190 K …”

“…The field-induced magnetic transition near T c is likewise eliminated when La is replaced with another rare earth element, which changes the transition from first order to second order. 9 , 110 …”