Self-crystallizing molecular models. III

Structures of typical molecular crystals are simulated in a `quantitative' way by the use of molecular models composed of two kinds of ferrite: one is magnetized barium ferrite and the other is a manganese-zinc ferrite of high permeability. These two components represent the permanent electric multipole and the electric polarizability of a molecule, repectively. On the basis of these molecular models, some predictions are made as to the unestablished crystal structures. The low temperature modification of C₂H₂ is probably either Pnnm (D¹²_2h) or Cmca(D¹⁸_2h). The lowest-temperature forms of CH₄ and CD₄are probably in the space groups I2m (D¹¹_2d), P4₂/nmc (D¹⁸_4h), Pban (D⁴_2h) or C2/c (C⁶_2h). The crystal structure of OsF₈ is probably R (C²_3i).