In order to understand the emergence of multiferroic behaviour in the RMnO3 type compounds, it is neccessary to understand the relationship between structural parameters such as the Mn-O-Mn bond angle, ionic radii of the R atom and the complex nature of the magnetic ordering that they exhibit. We have investigated SmMnO3 by doping with 'Y' at the Sm site to induce multiferroic behaviour in Sm1-xYxMnO3 for x~ 0,4 to 0.5. We propose to carry out Powder Diffraction experiments to investigate the changes in the magnetic ordering that take place going from the Neel temperature , through the transition at T~25K. This transition is coincident with the ferroelectric transition, in Sm0.5Y0.5MnO3, indicative of lock in transition at this temperature similar to that seen in multiferroics such as TbMnO3. A non absorbing isotope of Sm will be used for the synthesis of the sample for this experiments.