Magnetocaloric and cooling properties of the intermetallic compound AlFe2B2 in an AMR cycle system

Designing of magnetic MAB phases for energy applications

“…Moreover, Fe 2 AlB 2 was found to be a promising magnetocaloric material exhibiting an interesting MCE, 20 with the ordering temperature around 300 K conrmed by experimental 21,22 and theoretical studies. [23][24][25] Ke et al 26 investigated the intrinsic properties of Fe 2 AlB 2 , and found a MAE as large as À1.34 MJ cm À3 , in good agreement with the experiments. 22 Recently, Cr 4 AlB 4 with a novel structure of MAB phase has been synthesized consistent with the theoretical calculations.…”

“…in [100]-[010] direction) of the compound, as the SOC strength is comparable for Fe (55 meV) and Ni. Furthermore, for FeXB with X ¼ Ni, Pd, [20][21][22]25 To search for more candidates in the predicted MAB and non-MAB compounds, we performed screening based on the magnetic deformation proxy. 51 It is demonstrated that the magnetic entropy change DS M upon magneto-structural transitions has a strong correlation with the magnetic deformation of 2.03% and 1.96%, respectively.…”

Thermal stability of the nanolayered Fe2AlB2 in nitrogen and argon atmospheres

“…The MAB phases are atomically laminated ternary or quaternary transition metal (M) borides whose crystal structures are comprised of stacked M‐B (M = transition metal; B = boron) layers interlayered with one or two layers of an A element (Al or Zn) 1,2 . The MAB phase Fe 2 AlB 2 has garnered considerable research attention for its electrocatalytic water‐splitting ability, 3 favorable high‐temperature mechanical properties, 4 and for being a promising magnetocaloric material for active magnetic regenerative refrigeration 5,6 . Studying the thermal decomposition mechanisms of Fe 2 AlB 2 is therefore crucial to understand its limitations in prospective applications.…”

Magnetic and mechanical effects of Mn substitutions in AlFe2B2

“…Additionally, the presence of magnetocrystalline anisotropy leads to a substantial rotational entropy change, ∆S rot , in AlFe 2 B 2 . A theoretical study revealed a calculated relative cooling power (RCP) of 480 J/kg, which exceeds the reported experimental values and increases the potential use of the AlM 2 B 2 compounds in applications [17]. Electronic structure calculations for AlM 2 B 2 with a mixed metal occupation suggest an antiferromagnetic structure for AlMn 2 B 2 and that the characteristics on the magnetic ordering change when when going from AlFe 2 B 2 to AlMn 2 B 2 [18].…”