Synthesis and structure of aluminum substituted MoSi2 |
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Authors: | T DasguptaAK Bhattacharya AM Umarji |
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Institution: | a Material Research Centre, Indian Institute of Science, Bangalore 560012, India b Materials Division, National Aerospace Laboratories, Bangalore 560017, India |
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Abstract: | Mo(Si1−xAlx)2 compositions have been prepared by a modified SHS route under pressure. The compositional phase analysis indicates a body centered tetragonal C11b phase below x<0.05 substitution, above which a biphasic region of C11b and C40 structure coexists. Occurrence of pure hexagonal C40 phase is observed for x>0.1. The aluminum substitution leads to a continuous increase in the lattice parameters in both these structures. In the biphasic region, redistribution of aluminum concentration takes place with the evolution of aluminum rich C40 phase as indicated by energy dispersive X-ray analysis and supported by micro-hardness measurements. |
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Keywords: | 71 20 Lp 61 10 Nz 62 20 Qp |
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