Synthesis of hexagonal phases of WN and W2.25 N3 by high-pressure metathesis reaction
| Autor: | Hitoshi Yusa, Fumio Kawamura, Takashi Taniguchi |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Diffraction
Bulk modulus Materials science Hydrostatic pressure chemistry.chemical_element 02 engineering and technology Crystal structure Tungsten Nitride 021001 nanoscience & nanotechnology 01 natural sciences Crystallography chemistry.chemical_compound chemistry Tungsten carbide 0103 physical sciences Materials Chemistry Ceramics and Composites Isostructural 010306 general physics 0210 nano-technology |
| Zdroj: | Journal of the American Ceramic Society. 101:949-956 |
| ISSN: | 0002-7820 |
| DOI: | 10.1111/jace.15235 |
| Popis: | Hexagonal tungsten nitrides were synthesized by the metathesis reaction between WCl6 and NaN3 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 W2.25N3 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 (K0 = 342 ± 1 GPa) than that of hexagonal W2.25N3 (K0 = 291 ± 2 GPa). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Plný text