Nanocrystalline Ordered Vanadium Carbide: Superlattice and Nanostructure
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
Superlattices and Microstructures
ISSN: 0749-6036
, E-ISSN: 1096-3677
|
| Output data |
Year: 2016,
Volume: 90,
Pages: 148-164
Pages count
: 15
DOI:
10.1016/j.spmi.2015.12.006
|
| Tags |
Microstrains, Morphology, Nanoparticle size, Nonstoichiometry, Superstructure |
| Authors |
Kurlov A.S.
1
,
Gusev A.I.
1
,
Gerasimov E.Y.
2
,
Bobrikov I.A.
3
,
Balagurov A.M.
3
,
Rempel A.A.
1
|
| Affiliations |
| 1 |
Institute of Solid State Chemistry, Ural Branch of the Russian Academy of Sciences, Ekaterinburg 620990, Russia
|
| 2 |
Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, Novosibirsk 630090, Russia
|
| 3 |
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, Dubna, 141980, Moscow region, Russia
|
|
Funding (1)
|
1
|
Russian Science Foundation
|
14-23-00025
|
The crystal structure, micro- and nanostructure of coarse- and nanocrystalline powders of ordered vanadium carbide V8C7 have been examined by X-ray and neutron diffraction and electron microscopy methods. The synthesized coarse-crystalline powder of ordered vanadium carbide has flower-like morphology. It was established that the real ordered phase has the composition V8C7-δ (δ ≅ 0.03) deviating from perfect stoichiometric composition V8C7. The vanadium atoms forming the octahedral environment □V6 of vacant sites in V8C7-δ are displaced towards the vacancy □. The presence of carbon onion-like structures was found in the vanadium carbide powders with a small content of free (uncombined) carbon. The nanopowders of V8C7-δ carbide with average particle size of 20–30 nm produced by high-energy milling of coarse-crystalline powder retain the crystal structure of the initial powder, but differ in the lattice deformation distortion anisotropy.