Abstract
A novel quaternary 413-type Zr3TiSiC3 MAX phase has been synthesized in 97% yield by the vacuum carbosilicothermic reduction (VCSTR) method using mixtures of TiO2, ZrO2, SiC, and C powders as starting materials. The crystal structure of the synthesized Zr3TiSiC3 was studied by X-ray diffraction Rietveld analysis. The lattice constants of Zr3TiSiC3 MAX phase were a = 0.328292(5) nm and c = 2.39651(6) nm. It was revealed that the distribution of Zr and Ti atoms was fairly uniform in the basal plane of lattice, but was markedly inhomogeneous along the c-axis, with Zr atoms preferentially occupying the inner layers in the [M4X3] blocks rather than outer layers. The occupations of the outer and inner layers by Zr atoms were found to be approximately 67.4% and 82.6%, respectively, indicating a rather poor chemical ordering of Zr and Ti atoms in metal sublattice of Zr3TiSiC3 MAX phase.
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