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bonds attests for the presence of ordered BN domains and of carbon domains; (ii) the elemental profiles show that BN layers and carbon layers are immiscible with a radial organisation into two to five domains; and (iii) the sets of layers at free surfaces – including the inner surfaces of tubes – are always made of carbon. The origin of this chemical organisation, which is most likely obtained during the growth, is discussed. For the hafnium-boride metallic particles coated by C/BN envelopes, a model based on the solidification from the outside to the inside of isolated liquid-like droplets is proposed: the carbon phase solidifies first according to theoretical phase diagrams, and forms the outer shells. For the tubes, a directional eutectic solidification process is shown to account for the observed C/BN/C sequence, in a vapour–liquid–solid scheme, with an hafnium-rich liquid-like particle at the tip of the tube.
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Received: 26 November 1998 / Accepted: 14 January 1999
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Suenaga, K., Willaime, F., Loiseau, A. et al. Organisation of carbon and boron nitride layers in mixed nanoparticles and nanotubes synthesised by arc discharge . Appl Phys A 68, 301–308 (1999). https://doi.org/10.1007/s003390050892
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DOI: https://doi.org/10.1007/s003390050892