Interestingly, the observed behaviour of the model around room temperature is reminiscent of the experimentally observed room temperature phases of the related TMCMCdBr 3 , and the TMCM 1-x TMFM x CdCl 3 solidsolution at concentrations, x, between 0.3 and 0.5, solid solution. In all three cases, a structure with P6 3 mc symmetry is observed, which corresponds to disorder between the three sites with the same z-polarisation. This suggests a strong competition between a fully ordered Cc-phase stabilised by long-range strain contributions, and an entropically stabilised-but still ferroelectric-P6 3 mc-phase. For TMCMCdBrCl 2 the Cc-phase is observed at lower temperature. Whether the two first mentioned systems also condense to the fully ordered Cc-phase at lower temperature is unknown.