Research to develop single phase materials that are polar and ferromagnetic at room temperature is driven by the hope of switching ferroelectric order with an applied electric field, and vice versa, for applications including data storage. Corundum-derived oxides of ABO3 or A2BBO6 stoichiometry can accommodate magnetic cations and show long-range magnetic order and at the same time, often adopt polar crystal structures. This proposal focuses on tin-substitued Fe3InO6. Substituting with tin gives a polar crystal structure without being detrimental to the magnetic behaviour. This proposal seeks to understand the crystal and magnetic structures of InFe2.5Sn0.5O6 and how they are coupled. This will give greater insight into polar magnetic materials and how their properties can be optimised.