Published October 23, 2019
| Version v1
Publication
Polymorphic transformation from body-centered to face-centered cubic vanadium metal during mechanosynthesis of nanostructured vanadium nitride determined by extended x-ray absorption fine structure spectroscopy
Description
The pathway for vanadium nitride VN formation obtained by milling treatment has been traced
out. At the initial stages of the process, the reactant, vanadium metal, showing body-centered cubic
bcc structure, becomes highly distorted. Simultaneously, the formation of a small nucleus of the
product, VN, takes place. X-ray absorption spectroscopy XAS has allowed the quantification of
the distortion degree as well as the detection of the VN nucleus in the early stages of their formation,
while other standard structural characterization techniques are unable to detect such phenomena. For
increasing milling times, apart from the expected increase in the size of the VN nucleus, a
polymorphic transformation from bcc to fcc vanadium metal has been recorded. This phase might
play a key role in the overall synthesis process and could be a reaction intermediate in other solid
state processes involving V metal. The sensitivity of XAS to noncrystalline domains and to highly
distorted environments, as well as the use of high resolution x-ray diffraction, has provided the
relevant information to understand the whole reaction process.
Abstract
European Synchrotron Radiation Facility (ESRF)-ME-737Abstract
SpLine CRG (beamline BM25 at the ESRF)-25- 01-657Abstract
Ministerio de Educación y Ciencias de España-BQU2002-04364-C02-01 y BQU2002- 04364-C02-0Additional details
Identifiers
- URL
- https://idus.us.es/handle//11441/89835
- URN
- urn:oai:idus.us.es:11441/89835