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High pressure – high temperature studies and reactivity of γ‐Mo 2 N and δ‐MoN
Author(s) -
Machon D.,
Daisenberger D.,
Soignard E.,
Shen G.,
Kawashima T.,
TakayamaMuromachi E.,
McMillan P. F.
Publication year - 2006
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200521008
Subject(s) - high pressure , stoichiometry , diamond anvil cell , synchrotron , phase (matter) , chemistry , limiting , diffraction , reactivity (psychology) , x ray crystallography , analytical chemistry (journal) , nitrogen , crystallography , solid solution , materials science , thermodynamics , organic chemistry , mechanical engineering , medicine , physics , alternative medicine , optics , pathology , nuclear physics , engineering
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)