Enhanced magnetocaloric properties and reduced annealing time of off-stoichiometric La1.2Fe11.6Si1.4B0.75 melt-spun ribbons

The magnetocaloric effect properties for potential applications of magnetic refrigerator technology: a review

“…However, FOMT exhibits significant magnetic and thermal hysteresis, leading to losses in the performance of the MCE properties and a very narrow operating temperature range. 52,54 Examples of materials that exhibit FOMT include La(Fe,Si) 13 , 58 Gd 5 Si 2 Ge 2 , 59 MnAs 1− x Sb x , 35 Ni 65 Mn 20 Ga 15 , 28 and (Fe 0.98 Ni 0.02 ) 51 Rh 49 alloys. 34 On the other hand, if the first derivative presents a continuous curve marked by a magnetic phase transition at critical points with a broad temperature range, this behavior is known as a second-order magnetic phase transition.…”

“…In addition to the challenges in the economic aspect, prototype development, and sustainability optimization are expected to be the next challenges. These challenges include reducing the heat exchange time between the materials and heat exchangers, 65 integrating thermal change controls, 65,66 minimizing losses due to magnetic hysteresis, 58 enhancing mechanical stability and thermodynamic cycle sustainability, 11 and achieving good MCE performance at low magnetic field strengths and over a wide temperature range. 4,52 Efforts to solve these challenges have been undertaken by researchers, primarily using strategies such as (i) selecting alternative materials, (ii) adjusting chemical stoichiometry, (iii) modifying external parameters (pressure, magnetic field, and temperature), (iv) utilizing fluid mediums, and (v) reducing the size.…”

“…This led to presenting FOMT state and high −Δ S M values of 6.1, 20.2, and 13.5 J kg −1 K −1 under a magnetic field of 2 T. Additionally, the T C value increased with the addition of B concentration (188–191 K), associated with the presence of Fe–Fe exchange interactions with a broadening of the Fe–Fe distance and cell volume. 58 Another study compared the heating behavior of La(Fe 13− x Si x ) alloy-based materials using hot pressing sintering (HPS) and spark plasma sintering (SPS). 30 As observed from the porosity, density, and compressive strength analysis, the SPS method provided better mechanical properties than the HPS method.…”

Unlocking the Potential of Magnetic Refrigeration: Investigating the Compatibility of the Ga-Based Liquid Metal with a La(Fe,Mn,Si)13Hz Magnetocaloric Material for Enhanced Long-Term Stability

“…La­(Fe,Si) 13 represents a promising magnetocaloric material owing to its low material cost, better adiabatic temperature change and isothermal entropy change, and the possibility to tune its Curie temperature depending on the applications. − Preparation of the La­(Fe,Si) 13 alloy family with a single NaZn 13 phase is challenging. , Certain manufacturing processes require the addition of excess La, which is subsequently removed. , Depending on the degree of removal, it results in an alloy with insufficient or excess La, leading to, among others, the formation of the α-Fe phase. − It also affects the magnetic entropy change, either favorably or unfavorably. − Improvements are needed in the mechanical stability of the La­(Fe,Si) 13 alloy family, which is the focus of several studies. ,− …”