( <scp> <scp>Cr</scp> </scp> _2/3 <scp> <scp>Ti</scp> </scp> _1/3 ) ₃ <scp> <scp>AlC</scp> </scp> ₂ and ( <scp> <scp>Cr</scp> </scp> _5/8 <scp> <scp>Ti</scp> </scp> _3/8 ) ₄ <scp> <scp>AlC</scp> </scp> ₃ : New <scp>MAX</scp> ‐phase Compounds in <scp> <scp>Ti</scp> </scp> – <scp> <scp>Cr</scp> </scp> – <scp> <scp>Al</scp> </scp> – <scp> <scp>C</scp> </scp> System

Abstract

Two new MAX compounds, ( Cr 2/3 Ti 1/3 ) 3 AlC 2 and ( Cr 5/8 Ti 3/8 ) 4 AlC 3 , were successfully synthesized by hot‐pressing elemental powders at 1500°C for 1 h under 30 MPa in a flowing argon atmosphere. Their crystal structures were indentified and characterized by X ‐ray diffraction and transmission electron microscopy analysis. ( Cr 2/3 Ti 1/3 ) 3 AlC 2 and ( Cr 5/8 Ti 3/8 ) 4 AlC 3 have the same crystal structures with the well‐characterized Ti 3 AlC 2 and Ti 4 AlN 3 , respectively.