MXenes - 2D Nanomaterials

[@awaistraveljourney80]

Slam sir, are high entropy transition metal carbides and transition mono carbides (ZrC, HfC, TaC) in the category of MX phases?

[@qamarwali]

Wsalm, The *MAX* formula is *Mn+1AXn*, where *M* is early transition metals (Se, Te, V,....), *A* is group A elements (Al, Si,....) and *X* is only C or N. For MAX phase, the following must be satisfied: 1• the ratio of M:X must be (n+1/n) 2• A should be 1 3• X must be C or N otherwise, it will be not a MAX phase

[@culpamia709]

why we remove A layer sir, what about M and X layer

[@qamarwali]

Good question. There are two bonds M-A (Metallic in nature) and bond M-X ( which is covalent /ionic/metallic). The bonds between M-A is weaker than M-X and it is can be easily removed. The M can also be removed but then we get another structure that is called CDC, carbon derived carbon.,... Further I will make videos on this

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[@culpamia709]

sir can u pls explain how to derive this formula M n+1 A n Xn , can you pls use any example to derive it sir

[@qamarwali]

These are basically ternary carbide in most cases and the compound formed either Ti2SiC, Ti3Si2C2, Ti4Si3C3..... There are almost 1200 MAX phases confirmed by DFT.. Anyways I will explain this one too

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