Synthesis of two new o-MAX phases Mo2VAlC2 and Mo2V2AlC3 and their derivatives o-MXene Mo2VC2Tx and Mo2V2C3Tx

The out-of-plane ordered structure endows the o-MAX phase with more excellent properties and the derivative o-MXene with more promising applications. However, too few types of o-MAX and o-MXene have been synthesized for studying, significantly limiting their promising applications. In this work, two new high-purity o-MAX phases, Mo₂VAlC₂ and Mo₂V₂AlC₃, were successfully synthesized using an solid-phase reaction method and their ordered structures were demonstrated. The lattice parameters, X-ray diffraction data, and microstructure of these two o-MAX phases were clearly determined. Meanwhile, two new o-MXene, Mo₂VC₂T_x and Mo₂V₂C₃T_x, were also obtained by etching the o-MAX powders in HF solution, which would expand their further interesting researches.