Arrowhead-like diamond crystals formed by hot-filament chemical vapor deposition

Arrowhead-like diamond crystals have been formed by using a simple method o f hot-filament-assisted chemical vapor deposition. These are contact twins with {111} as the twin plane, of which each individual is composed, of {100 }, {110} and {111} faces. These twins flatten along (110) face and elongate parallel to (111) contact. plane. The flattened (110) face consists of man y {110} terraces sided by [110] and [112] steps. So the twinned crystal loo ks like an arrowhead. These twins are formed just underneath the uppermost substrate temperature for diamond growth. (C) 1999 Published by Elsevier Sc ience S.A. All rights reserved.