Abstract
Synthetic diamond powder of micron size was annealed in an argon atmosphere at 1900 K during 15 min. An incomplete phase transition diamond → graphite was studied by the TEM (transmission electron microscopy) methods. Disruption of (111) diamond planes packing and the lonsdaleite layers formation took place in the process of annealing. Particles contained fragments of graphite, diamond and layers with defect structure. Among the fringes with the interplanar spacing d 111 = 0.206 nm, corresponding to {111} diamond planes, some areas with the doubled interplanar distances 2 d 111 were found, which were formed as a result of some sp 3 -bonds rupture during the heating.
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