Kinetics of the Graphitization of Dispersed Diamonds at "Low" Temperatures Full article
Journal |
Journal of Applied Physics
ISSN: 0021-8979 , E-ISSN: 1089-7550 |
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Output data | Year: 2000, Volume: 88, Number: 7, Pages: 4380-4388 Pages count : 9 DOI: 10.1063/1.1289791 | ||||||
Tags | ONION-LIKE CARBON; GRAPHITE-LIKE STRUCTURES; SURFACES | ||||||
Authors |
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Affiliations |
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Funding (3)
1 | Russian Foundation for Basic Research | 98-03-32385 |
2 | International Association for the Promotion of Co-operation with Scientists from the New Independent States of the Former Soviet Union | 97-1700 |
3 | Civilian Research and Development Foundation | RC1-251 |
Abstract:
The bulk density of graphitized ultradisperse diamond (UDD) was measured by a gamma-ray attenuation method at 1370–1870 K. These data combined with small angle x-ray scattering and true density measurements of the samples heated at various fixed temperatures were used to study the graphitization kinetics of the UDD. The reaction rate was modeled as a migration rate of the interface between the developing graphite-like carbon and the remaining diamond phase. A “reducing sphere” model was used to obtain the rates from the changes in densities. The estimated kinetic parameters in an Arrhenius expression, namely the activation energy,E=45±4 kcal/mol,E=45±4 kcal/mol, and the pre-exponential factor, A=74±5 nm/s,A=74±5 nm/s, allow quantitative calculations of the diamond graphitization rates in and around the indicated temperature range. The calculated graphitization rates agree well with the graphitization rates of diamonds with different dispersity estimated from high-resolution transmission electron microscopy data. The large difference between the rates and the kinetic parameters obtained in this study and those estimated by G. Davies and T. Evans [Proc. R. Soc. London 328, 413 (1972)] for the temperature range 2150–2300 K indicates that there are different graphitization mechanisms operating in the “low” and “high” temperatures regions.
Cite:
Butenko Y.V.
, Kuznetsov V.L.
, Chuvilin A.L.
, Kolomiichuk V.N.
, Stankus S.V.
, Khairulin R.A.
, Segall B.
Kinetics of the Graphitization of Dispersed Diamonds at "Low" Temperatures
Journal of Applied Physics. 2000. V.88. N7. P.4380-4388. DOI: 10.1063/1.1289791 WOS Scopus РИНЦ
Kinetics of the Graphitization of Dispersed Diamonds at "Low" Temperatures
Journal of Applied Physics. 2000. V.88. N7. P.4380-4388. DOI: 10.1063/1.1289791 WOS Scopus РИНЦ
Dates:
Submitted: | Dec 14, 1999 |
Accepted: | Jun 30, 2000 |
Published online: | Sep 19, 2000 |
Published print: | Oct 1, 2000 |
Identifiers:
Web of science | WOS:000089371600090 |
Scopus | 2-s2.0-0001609076 |
Elibrary | 13343152 |
Chemical Abstracts | 2000:669369 |
Chemical Abstracts (print) | 133:338887 |
OpenAlex | W2015317636 |