Abstract
The structure and chemistry of what initially was proposed to be Ti3Al2N2 are incorrect. Using high‐resolution transmission electron microscopy, together with chemical analysis, the stoichiometry of this compound is concluded to be Ti4AlN3‐delta (where delta = 0.1). The structure is layered, wherein every four layers of almost‐close‐packed Ti atoms are separated by a layer of Al atoms. The N atoms occupy ∼97.5% of the octahedral sites between the Ti atoms. The unit cell is comprised of eight layers of Ti atoms and two layers of Al atoms; the unit cell is hexagonal with P63/mmc symmetry (lattice parameters of a= 0.3 nm and c= 2.33 nm). This compound is machinable and closely related to other layered, ternary, machinable, hexagonal nitrides and carbides, namely M2AX and M3AX2 (where M is an early transition metal, A is an A‐group element, and X is carbon and/or nitrogen).
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