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Synthesis of hexagonal phases of WN and W 2.25 N 3 by high‐pressure metathesis reaction
Author(s) -
Kawamura Fumio,
Yusa Hitoshi,
Taniguchi Takashi
Publication year - 2018
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15235
Subject(s) - isostructural , tungsten , tungsten carbide , hexagonal crystal system , nitride , materials science , salt metathesis reaction , crystallography , bulk modulus , metathesis , carbide , hydrostatic pressure , nitrogen , crystal structure , analytical chemistry (journal) , mineralogy , chemistry , metallurgy , nanotechnology , composite material , thermodynamics , organic chemistry , physics , layer (electronics) , polymerization , polymer
Hexagonal tungsten nitrides were synthesized by the metathesis reaction between WC l 6 and NaN 3 under high pressure and temperature. As well as tungsten mononitride ( WN ), which is isostructural with hexagonal tungsten carbide ( WC ), a nitrogen‐rich hexagonal compound was also confirmed in the product. The ratio of nitrogen to tungsten was determined to be 1.34 by the quantitative combustion method. The composition was estimated to be W 2.25 N 3 by considering the crystal structure that is best explained by the X‐ray diffraction profile. Volume compression measurements under hydrostatic pressure revealed that the WC ‐type WN has a higher bulk modulus ( K 0 = 342 ± 1 GP a) than that of hexagonal W 2.25 N 3 ( K 0 = 291 ± 2 GP a).