Synthesis and structure of aluminum substituted MoSi2

✍ Scribed by T. Dasgupta; A.K. Bhattacharya; A.M. Umarji

• Book ID: 104166143
• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 179 KB
• Volume: 126
• Category: Article
• ISSN: 0038-1098
• DOI: 10.1016/s0038-1098(03)00300-4

✦ Synopsis

Mo(Si 12x Al x ) 2 compositions have been prepared by a modified SHS route under pressure. The compositional phase analysis indicates a body centered tetragonal C11 b phase below x , 0:05 substitution, above which a biphasic region of C11 b 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.