Title
Formation of amorphous carbon and graphite in CVD diamond upon annealing: A HREM, EELS, Raman and optical study Formation of amorphous carbon and graphite in CVD diamond upon annealing: A HREM, EELS, Raman and optical study
Author
Publication type
article
Publication
Berlin :Wiley-v c h verlag gmbh ,
Subject
Physics
Source (journal)
Physica status solidi: A: applied research. - Berlin
Source (book)
6th International Workshop on Surface and Bulk Defects in CVD Diamond, MAR 01-02, 2001, DIEPENBEEK HASSELT, BELGIUM
Volume/pages
186(2001) :2 , p. 207-214
ISSN
0031-8965
ISI
000170435000006
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
Polycrystalline diamond thick films were subjected to annealing in vacuum at temperatures of 1350-1450 degreesC. The films were examined by optical absorption, Raman spectroscopy, transmission electron microscopy and electron energy loss spectroscopy. The formation of amorphous carbon and/or of well-crystallized graphite layers up to 20 nm thick was evidenced along grain boundaries. Intra-granular nanometer-sized graphite islands were also observed, sometimes as transformed micro-twin bands. The diamond-to-graphite transition occurs in such a way that three (111) diamond planes transform into two (0002) graphitic sheets. The internal graphitization causes a severe degradation of the optical quality of the diamond films.
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