High pressure - high temperature studies and reactivity of γ-Mo2N and δ-MoN

✍ Scribed by Machon, D. ;Daisenberger, D. ;Soignard, E. ;Shen, G. ;Kawashima, T. ;Takayama-Muromachi, E. ;McMillan, P. F.

• Book ID: 105363303
• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 337 KB
• Volume: 203
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200521008

✦ Synopsis

Abstract

A combination of high pressure – high temperature synthesis and laser‐heated diamond anvil cell experiments, using synchrotron X‐ray diffraction has been used to investigate the phases in the Mo~2~N–MoN system under these conditions. Under conditions of high nitrogen activity, δ‐MoN appears to be a limiting phase i.e. there is no evidence for formation of new compounds such as Mo~3~N~4~ or Mo~3~N~5~, that are encountered in the Zr–N, Hf–N or Ta–N systems. When γ‐Mo~2~N is heated or prepared under conditions of high N~2~ activity, δ‐MoN is formed. The results indicate (a ) that there is no stable cubic stoichiometric “γ‐MoN” phase formed even under conditions of high pressure – high temperature and high N~2~ activity, and (b ) that no solid solution is formed between γ‐Mo~2~N and δ‐MoN. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)