Zirconium I 4400 [Zr0.72Y0.28]Al4C4: A New Member of the Homologous Series (MC)l(T4C3)m (M: Zr, Y and Hf, T: Al, Si and Ge). -The new layered title carbide is prepared from a mixture of ZrC, YC2, and Al4C3 in the molar ratio 5:5:11 (Ar, 2273 K, 30 min) and characterized by powder XRD, TEM, and EDX. Zr0.72Y0.28Al4C4 crystallizes in the trigonal space group P3m1 with Z = 1. The structure contains [Zr0.72Y0.28C2] thin slabs separated by [Al4C4] layers. The carbide is the first member of the title series with l = 1 and m = 1. -(SUGIURA, K.; IWATA, T.; NAKANO, H.; FUKUDA*, K.; J. Solid State Chem.