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The neutron powder profiles for CBr2C12 and CBrC13 have been recorded at temperatures ranging from about 260 K to 5 K. The profiles at theo highest temperatures are consistent with fcc structures with a = 8.597(2) A and a = 8.526(2) A respectively. CBrC13 has a second plastic phase observed at 245 K. The remaining profiles, below 250 K for CBr2CI2, or below 225 K for CBrC13, can be analysed in terms of the C2/c space group with 2 = 32. This is the same as for the ordered phases of CBr4 and CC14. Orientational disorder of the molecules leads to the structural similarity of all members of the family, Tests for partial ordering were not successful.

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