The applicants seek 3 days of beam time on POLARIS to study hydrogen release systems comprising M(NH3)6X2 (M=Mg, X=Cl) coupled with LiH and MgH. Mg(NH3)6Cl2 is an important class of material for both ammonia storage and hydrogen storage which can theoretically store 51.7% NH3 and indirectly store 9.7% H2. When Mg(NH3)6Cl2 is coupled with LiH, this system can theoretically release 4.9%H2 and when coupled with MgH2 can theoretically release 4.5%H2.In order to understand the mechanisms involved in these hydrogen release systems, when each molecule of NH3 and H2 is released and also allow us to determine an optimum hand milling time at room temperature, PND is pivotal. This will be coupled with PXD, TGA/MS, IR and Raman in order to aid in the understanding the mechanisms involved.