Neutron diffraction studies were performed to determine the structure
of the ordered ZrV2D2 phase with the wave vector k = (1/2 1/2 1/2). Th
e genetic relation was established between this structure and the supe
r-structures es ZrV2D3, k = (001) and ZrV2D4, k = 0. The ZrV2D2 supers
tructure was found to be a progenitor of all the other Lifshitz hydrog
en superstructures based on cubic Laves phases.