Crystal structure of Cr4AlB4: A new MAB phase compound discovered in Cr-Al-B system

Designing of magnetic MAB phases for energy applications

“…Moreover, among all the structure types considered in this work, 136 compounds are stable with the 414-type structure, albeit the rst compound Cr 4 AlB 4 was reported in 2019. 27 Taking the 212-type MAB structure as an example, the stability trend with respect to the chemical composition can be understood based on the Hume-Rothery rules. 71 Such rules are formulated based on the difference of size, electronegativity factors and the valence electron concentration (VEC).…”

“…22 Recently, Cr 4 AlB 4 with a novel structure of MAB phase has been synthesized consistent with the theoretical calculations. 27 Khazaei et al 28 carried out high-throughput (HTP) calculations on Al-containing non-magnetic MAB phases and predicted 9 stable compounds. More recently, Miao et al 29 reported another HTP screening for Ti-A-B, Zr-A-B, and Hf-A-B and predicted 7 thermodynamically stable compounds.…”

Chemical order or disorder – a theoretical stability expose for expanding the compositional space of quaternary metal borides

“…quaternary compounds displaying inplane or out-of-plane chemical order for two M elements, [9][10][11] have been converted into MXenes upon selective etching. 10,[12][13][14][15] So-called MAB phases are also atomically laminated, though they display different crystal structures and show a wider palette of structural variations, from orthorhombic M n+1 AlB 2n (with n = 1-3), [16][17][18] MAlB 17 and M 4 AlB 4 , 19 hexagonal M 2 AB 2 , 20,21 to tetragonal M 5 AB 2 (T2), 22 but with M mainly from Groups 6 to 9. There are a few reports on the attempted synthesis of 2D MBenes through selective etching of layered ternary MAB phases; [23][24][25] however, the realization of individual single-layer sheets from these materials still remains a quest.…”

Synthesis and Property Characterization of Ternary Laminar Zr2SB Ceramic

“…Especially, there are B-B bonds in MAB phase, but not in MAX phase. The known MAB phases include MAlB (M = Mo, W) phase, M 2 AlB 2 (M = Mn, Cr, Fe) phase, M 5 Si 3 B x (M = Cr, Hf) phase [8][9][10] and etcetera. Like MAX phase, MAB phase also has a series of interesting properties.…”