Journal
INORGANIC CHEMISTRY
Volume 56, Issue 23, Pages 14388-14395Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.7b01003
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Funding
- Algerian government
- French government
- ANR [13-BS09-0024-02]
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Ti-3[Al(1-delta)Cub(delta)] C-2 MAX phase solid solutions have been synthesized by sintering compacted Ti3AlC2-Cu composites produced by mechanical milling. Using X-ray and neutron diffraction techniques, it is demonstrated that the Cu mixing into the Al site is accompanied by lattice distortion, which leads to symmetry reduction from a hexagonal to a monoclinic structure. Such symmetry reduction likely results from this mixing through deviation of the A-site position from the special (0, 0, 1/4) position within the P6(3)/mmc space group of the original Ti3AlC2 structure. Moreover, it is demonstrated that the Cu admixture into the A site can be adjusted from the composition of the reactant mixture. The lattice parameter variation of the solid solution compounds, with 10-50 atom % Cu in the A site, is found to be consistent with Vegard's law.
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