ON THE ROLE OF NONEQUILIBRIUM IN THE THERMODYNAMICS OF ULTRAFINE POWDERS

Authors
ASINOVSKII EI POLAK LS
Citation
Ei. Asinovskii et Ls. Polak, ON THE ROLE OF NONEQUILIBRIUM IN THE THERMODYNAMICS OF ULTRAFINE POWDERS, High energy chemistry, 28(5), 1994, pp. 368-371
Citations number
14
Categorie Soggetti
Chemistry Physical
Journal title
High energy chemistry → ACNP
ISSN journal
00181439
Volume
28
Issue
5
Year of publication
1994
Pages
368 - 371
Database
ISI
SICI code
0018-1439(1994)28:5<368:OTRONI>2.0.ZU;2-1
Abstract
A mechanism of the emergence of excess surface tension in titanium nit ride ultrafine powders is discussed. It is shown that this tension may arise if there is a radial concentration gradient of the excess vacan cies in a particle. The most probable cause of the appearance of this gradient is a short cooling time of a particle in the reactor. The pro posed model satisfactorily describes the experimental dependences of t he lattice parameter on particle size and annealing temperature.