Transmission electron microscopy and high-resolution electron microscopy studies of structural defects induced in 6H α-SiC single crystals irradiated by swift Xe ions
- 1 February 1994
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine A
- Vol. 69 (2) , 237-253
- https://doi.org/10.1080/01418619408244341
Abstract
Single crystals of 6Hα-SiC, p type, were irradiated with 5·5GeV Xe ions supplied by GANIL close to the 〈0001〉 crystal axis with fluences up to 1015 Xe cm−2. After irradiation the colour of the crystals changed in the irradiated zone. Transmission electron microscopy observations of samples which had been irradiated and then annealed at 1373 K revealed the presence of loops lying in basal and prismatic planes. Basal faults have an interstitial character with a Burgers vector of the type 1/6〈0001〉. Contrast analyses as well as high-resolution electron microscopy observations allowed us to propose a geometrical model for the new defects observed in prismatic planes of the 6H polytype. These prismatic loops are the consequence of interstitial precipitation in {1012} pyramidal planes; the fault plane has a ‘zigzag’ configuration and a Burgers vector of the type 1/18〈8081〉.Keywords
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