  The elemental diversity is crucial to screen out ternary MAX phases with
outstanding properties via tuning of bonding types and strength between
constitutive atoms. As a matter of fact, the interactions between M and A atoms
largely determine the physical and chemical properties of MAX phases. Herein,
Se element was experimentally realized to occupy the A site of a MAX phase,
Zr2SeC, becoming a new member within this nanolaminated ternary carbide family.
Comprehensive characterizations including Rietveld refinement of X-ray
Diffraction and atom-resolved transmission electron microscopy techniques were
employed to validate this novel MAX phase. The distinct thermal conduction
behaviors emerged are attributed to the characteristic interactions between Zr
and Se atoms.
