The aim of the present proposal is to establish the structure of the ferroelectric phase of CdTiO3 and to determine the nature of the ferroelectric-paraelectric phase transition. This will be achieved through the use of high resolution powder neutron diffraction, collected at fine temperature intervals on a suitably enriched 114CdTiO3 sample. CdTiO3, like BaTiO3 and PbTiO3, is a displacive type ferroelectric, however whilst the structures and phase transitions in BaTiO3 and PbTiO3 are well understood there is considerable uncertainty regarding the nature of the ferroelectric phase in CdTiO3.