A definitive structural model of LiCaN from powder neutron diffraction (PND) is an important first step towards a systematic study of the process and mechanism of hydrogenation in this system. We propose here to investigate LiCaN and a small number of related samples at ambient and elevated temperature. The PND experiment is especially vital in complementing PXD, sorption (volumetric, gravimetric) and thermal analysis in particular since it is the only technique which will give us definitive structures, stoichiometries and information on thermal displacements of the materials; this is especially important in the location of lithium nitrogen, deutrerium (which will use to replace H in these ex-situ experiments) and hence associated vacancies and cation distributions. We intend this study to form a foundation for future work.