抄録
A new layered carbide, [Zr0.72(3)Y0.28(3)]Al4C4, has been synthesized and characterized by X-ray powder diffraction, transmission electron microscopy and energy dispersive X-ray spectroscopy (EDX). The atom ratios [Zr : Y] were determined by EDX, and the initial structure model was derived by the direct methods, and further refined by the Rietveld method. The crystal is trigonal (space group P-3m1, Z = 1) with lattice dimensions of a = 0.333990(5) nm, c = 1.09942(1) nm and V = 0.106209(2) nm3. This compound shows an intergrowth structure with [Zr0.72Y0.28C2] thin slabs separated by Al4C3-type [Al4C4] layers. It is a new member with l = 1 and m = 1 of the homologous series, the general formula of which is (MC)l(T4C3)m (l = 1, 2 and 3, m = 1 and 2, (M=Zr, Y and Hf, T=Al, Si and Ge).
