Pd-Fe alloys are of interest due to the unusual interplay between the magnetic and mechanical properties they display. Examples include shape-memory effects in Fe-rich alloys, and the pressure induced zero thermal expansion (Invar' behaviour) of Pd-rich alloys. Previous work has shown that Pd3Fe undergoes a large volume collapse under a pressure of 12GPa, with a loss of magnetic order. At this pressure the sample also displays almost zero thermal expansion up to 550K. From subsequent simulations and inelastic studies, it is not clear whether the sample becomes magnetically spin-disordered or geometrically frustrated (non-collinear). This study proposes a 3 day single-crystal neutron diffraction study on WISH in order to characterise the magnetic structure of the sample in this high pressure phase. This study hopes to provide insight into the nature ofInvar' behaviour in binary alloys.