A new carbon structure in annealed film coatings of the carbon–lead system

Carbon–lead solid solutions coexisting with amorphous carbon have been obtained for the first time in a film coating deposited by ion-plasma sputtering. During subsequent vacuum annealing of carbon–lead films containing more than 68.5 at % Pb, this element almost completely evaporates to leave an amorphous carbon coating on a substrate. During annealing at 1100$^\circ$C, this amorphous carbon crystallizes into a new hexagonal lattice with unit cell parameters $a$ = 0.7603 nm and $c$ = 0.8168 nm. Characteristic X-ray diffraction data for the identification of this phase are determined.