A superlattice with monoclinic symmetry based on the compound V6C5

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Abstract
The ordered distribution of carbon vacancies in the compound V6C5 has been analysed by electron diffraction and dark-field electron microscopy. The dominant structure is that based on a superlattice with monoclinic symmetry having a lattice orientation relation with the disordered cubic matrix which may be summarized: The unit cell parameters, neglecting a distortion of the f.c.c. vanadium atom structure, are The vacancy distribution is related to that previously observed for this compound and found in the present investigation in minor fraction. The difference in the vacancy distribution is determined by the alternative stacking sequences of partially filled octahedral carbon atom layers. Hence one structure may be derived from the other by an ordering in the distribution of stacking faults which have been identified in the carbon sub-lattice.

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