Outstanding Comprehensive Performance of La(Fe, Si)₁₃H_y/In Composite with Durable Service Life for Magnetic Refrigeration

Abstract

temperature, has become a promisingly alternative technology to the existing vapor-compression refrigeration due to its energy efficiency and environment friendly. [4][5][6] As the core part of magnetic refrigeration, the comprehensive performance including MCE, thermal conductivity (λ), preparation and fabrication, corrosion resistance, and thermal and magnetic field cycling stabilities for magnetocaloric materials greatly affect the performance of the magnetic refrigerator. [7,8] Pure Gd, as the benchmark magnetic refrigerant, is commonly used in the active magnetic regenerator prototypes. [9,10] In particular, Gd metal could be produced into different shapes due to its good mechanical properties, such as thin plate, sphere, and microwire, and it has been demonstrated that microwire is more desirable for realizing a higher cooling performance. [11][12][13][14][15][16] However, Gd metal also has its disadvantages such as relatively low magnetic entropy change (ΔS M ), limited availability, and expensive price that hinder its large-scale commercialization. Therefore, a great number of magnetic materials with large MCE around room temperature have been extensively explored in the past decades. [2,6,[17][18][19][20] Unfortunately, although these new materials exhibit much better MCE than that of Gd, they still have severe shortcomings such as hard preparation Magnetic refrigeration based on magnetocaloric effect (MCE) has become a promisingly alternative technology to the conventional vapor-compression refrigeration. A great number of magnetic materials have been reported to exhibit larger MCE than that of the benchmark magnetic refrigerant Gd.However, these materials still have severe shortcomings on the "Non-MCE" properties, such as hard preparation and fabrication, low thermal conductivity λ, and poor corrosion resistance and cycling stabilities, which hinder the practical application of these materials. In this paper, a novel La(Fe, Si) 13 H y / In composite which is prepared by a readily available hot pressing method is demonstrated to exhibit an outstanding comprehensive performance with durable service life in various aspects. Noteworthily, the ΔS M does not decrease but increases with increasing nonmagnetic In metal. This advantageous anomaly is related to the strengthening of the first-order itinerant electron metamagnetic transition induced by residual compression stress and surrounded constraints in the composite. The present results make La(Fe, Si) 13 H y /In composite the most attractive alternative to Gd for magnetic refrigeration. Moreover, this work also provides a feasible way to solve the serious issues toward applications for La(Fe, Si) 13 -based materials and other brittle magnetocaloric materials.

Characterization of caloric effects for magnetostructural transition materials: State-of-the-art and prospects

“…Mn-Fe-P-Si样品在1 T磁场中的比热曲线, 经过数值计 算得到了约2.5 K绝热温变. 这一方法被广泛应用在 Gd [26] , La-Fe-Si-H [27,28] , Fe-Rh [29] 等材料的绝热温变计 算中. 然而这一准直接手段耗时长, 对样品表面质量和 尺寸有特定要求, 而且很难对材料进行循环测试.…”

“…团队 [44] 利用梯度提升回归树(GBDT)方法预测La(Fe, [42] 、扫描式霍尔探头 [45] 和磁光-克尔显微镜 [45] 因而, 在已有报道中, 磁热效应的循环稳定性往往采用 间隙式测量 [28] , 或者只涉及几十次的少量循环 [29] . 最近, 本文作者通过应用非接触式红外成像仪测 试了多样品绝热温变.…”

Fe doping effect on EuTiO3: The magnetic properties and giant magnetocaloric effect

“…Magnetocaloric (MCE) material is very important for the development of magnetic refrigerator (MR), which has a good advantage in efficiency and environmental protection compared to the conventional gas refrigeration . The magnetic entropy change (−Δ S M ) and refrigerant capacity (RC) are two important parameters.…”

Reversal Magnetocaloric Effect in the Antiferromagnetic TbFe<sub>2</sub>Al<sub>10</sub> Compound

“…In the refrigeration area, magnetocaloric effect (MCE) technology plays an important role for its high energy-efficiency and eco-friendly characteristics, especially compared with the traditional common gas compression refrigeration. [1][2][3][4][5][6][7][8][9] Normally, magnetic refrigeration working materials can be cataloged into low temperature zone (below 20 K), medium temperature zone (20-77 K) and high temperature zone (77 K or above, including room temperature) magnetic refrigeration materials, according to different working temperature zones. In the past several decades, domestic and foreign scientific research teams have made a series of important progress in the exploration and design of magnetocaloric materials.…”

“…In the past several decades, domestic and foreign scientific research teams have made a series of important progress in the exploration and design of magnetocaloric materials. [5][6][7][8][9] In the zone of room temperature, Professor Pecharsky and Gschneidner of the Ames Laboratory in the United States reported the Gd 5 (Si x Ge 1-x ) 4 series of compounds with giant magnetocaloric effects in 1997. [8] In the same year, Professor Du in Nanjing University has extensively studied the perovskite-like compound La 1-x Ca x MnO 3 ; [9] Consequently, Ni-Mn-Ga alloy and La (Fe, Si) 13 materials were reported.…”