Abstract
Ta 4AlC 3, a new member of the M n+1 AX n -phase family, has been synthesized and characterized ( n = 1–3; M = early transition metal; A = A-group element; and X = C and/or N). Phase determination by Rietveld refinement of synchrotron X-ray diffraction data shows that Ta 4AlC 3 belongs to the P6 3/ mmc space group with a and c lattice parameters of 3.10884 ± 0.00004 Å and 24.0776 ± 0.0004 Å, respectively. This is shown to be the α-polymorph of Ta 4AlC 3, with the same structure as Ti 4AlN 3. Lattice imaging by high-resolution transmission electron microscopy demonstrates the characteristic MAX-phase stacking of α-Ta 4AlC 3. Three modes of mechanical deformation of α-Ta 4AlC 3 are observed: lattice bending, kinking and delamination.
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