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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 (D122h) or Cmca(D182h). The lowest-temperature forms of CH4 and CD4are probably in the space groups I{\bar 4}2m (D112d), P42/nmc (D184h), Pban (D42h) or C2/c (C62h). The crystal structure of OsF8 is probably R{\bar 3} (C23i).
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