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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.19 SNIP: 0.341 CiteScore™: 0.43

ISSN Print: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v9.i2.70
pages 253-262

X-ray characterization of structural defects in electroexplosive nanopowders

Vladimir An
High Voltage Research Institute, Tomsk Polytechnic University, 2a Lenin Ave., Tomsk 634050, Russia
Alexander Ilyin
High Voltage Research Institute, Tomsk Polytechnic University, 2a Lenin Ave., Tomsk 634050, Russia
Charles de Izarra
LASEP (Laboratoire d'Analyse Spectroscopique et d'Energetique des Plasmas), UFR-Faculte des Sciences, Antenne de BOURGES, Universite d'ORLEANS, rue Gaston Berger, BP 4043, 18028 BOURGES CEDEX, FRANCE

ABSTRACT

X-ray structure investigations of nanosized aluminum and copper powders prepared with a transient plasma process by wire electrical explosion (WEE) have been carried out To compare structural characteristics, powders produced by conventional routes have also been investigated. Calculations of lattice parameter values in different plane (hkl) directions were done using experimental data. Visible deviations of lattice parameter vataes for nanosized powders, in comparison with JCPDS references and powders prepared through conventional pathways, have been found out. To determine the influence of the dimensional fector on microdeformations, all specimens were divided into sub-micronic and nanometric fractions by the sedimentation in cold absolute alcohol. According to X-ray structure analysis, the increase of lattice parameter is more considerable in the submicronic fraction of electroexplosive powder than that of nanometric fraction. The conclusion was made that severe conditions of etectroexplosive powders fabrication, as well as different cooling rates of particles, can play an essential role in the deformation of their crystal lattice. In addition, we may conclude that the deformation of the crystal lattice corresponds to an energy excess stored in these nano-sized powders prepared with the wire electrical explosion technology.


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