Ultradisperse-diamond nanoclusters. Fractal structure and diamond-graphitephase transition

Citation
Mv. Baidakova et al., Ultradisperse-diamond nanoclusters. Fractal structure and diamond-graphitephase transition, CHAOS SOL F, 10(12), 1999, pp. 2153-2163
Citations number
41
Categorie Soggetti
Multidisciplinary
Journal title
CHAOS SOLITONS & FRACTALS
ISSN journal
09600779 → ACNP
Volume
10
Issue
12
Year of publication
1999
Pages
2153 - 2163
Database
ISI
SICI code
0960-0779(199912)10:12<2153:UNFSAD>2.0.ZU;2-A
Abstract
A systematic study of the diamond graphite structural phase transition in u ltradisperse-diamond clusters obtained by the detonation technique is repor ted. Samples of two types, differing in the kinetics of detonation-product cooling, were investigated. The phase transition was achieved under heating in an inert atmosphere in the temperature range 720-1400 K. X-ra character ization showed the ultradisperse-diamond, irrespective of the cooling rare used, to be a cluster material possessing a diamond structure with a charac teristic nanocrystal size of 44 Angstrom. The diamond graphite structural p hase transition in ultradisperse diamond is shown to start from the cluster surface inwards at T-pt approximate to 1200 K, i.e., at substantially lowe r temperatures than is the case with bulk diamond single crystals. Ultradis perse-diamond clusters are shown to be fractal objects and the character of variation of the fractal dimension in the course of the diamond-graphite p hase transition is studied. (C) 1999 Elsevier Science Ltd. All rights reser ved.