SYNTHESIS AND STRUCTURE OF T-2-AL2MGC2

The T-1 and T-2 crystalline varieties of the ternary carbide Al2MgC2 w ere synthesized by reacting graphite particles with Mg-Al melts at 930 -1020 K. Below 1000 K, the T-1 variety was predominant but little amou nts of T-2 were also present. At 1000 K and above, only the T-2 variet y was obtained. Assuming a hexagonal close packing of the metal atoms, the crystal structure of T-2-Al2MgC2 was determined by Rietveld refin emenent from X-ray powder diffraction data.