Synthesis, crystal structure, and density of (W1−xAlx)C |
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Authors: | JM Yan W Zhao HG Tang CJ Zhu |
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Institution: | Chemistry Laboratory of Materials and Devices, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China |
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Abstract: | A new solid solution system of Al in WC, with the stoichiometry of (W1−xAlx)C (x=0.10, 0.25, 0.50, 0.75, 0.86), has been synthesized by a solid-state reaction between W1−xAlx alloys and carbon at around 1673 K in vacuum. Environment scanning electron microscope, energy-dispersive analysis of X-ray, X-ray photoelectron spectroscopy, and inductively coupled plasma analyses are used to certify the formation of the products. The mechanism of the solid-state reaction is also discussed. (W1−xAlx)C is identified to crystallize in the hexagonal space group P6m2 (No. 187) and belongs to the WC structure type. The atoms of W and Al occupy the same lattice site (1a site) in the cell of (W1−xAlx)C. The cell parameters for each specimen in the phase of W-Al-C are quite close to that of WC, while their densities are far lower than that of WC. |
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Keywords: | (W1&minus xAlx)C solid solution Solid-state reaction Reactive mechanism Crystal structure Density |
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