Syntheses, crystal structures and Si solubilities of new layered carbides Zr2Al4C5 and Zr3Al4C6 |
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Authors: | Keita Sugiura Hideto Yoshida Koichiro Fukuda |
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Affiliation: | a Department of Environmental and Materials Engineering, Nagoya Institute of Technology, Nagoya 466-8555, Japan b Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, Tokyo 113-0033, Japan |
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Abstract: | Two types of new ternary carbides, Zr2Al4C5 and Zr3Al4C6, have been synthesized and characterized by X-ray powder diffraction. The crystal structures were refined from laboratory X-ray powder diffraction data (CuKα1) using the Rietveld method. These carbides form a homologous series with the general formula (ZrC)mAl4C3 (m=2 and 3). The crystal structures can be regarded as intergrowth structures where the Al4C3-type [Al4C4] layers are the same, while the NaCl-type [ZrmCm+1] layers increase in thickness with increasing m value. The new carbides are most probably the end members of continuous solid-solutions (ZrC)m[Al4−xSix]C3 with 0?x?0.44. |
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Keywords: | Layered carbides Solid solutions Powder diffraction Rietveld refinement |
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