The drive for increasing energy efficiency and reducing greenhouse gas emissions has garnered increasing support for the use of fuel cell technology, which offers the potential for applications ranging from transport to stationary power generation. In terms of the latter, solid oxide fuel cells, which represent all solid state systems operating at elevated temperature (500-1000C), are the preferred option. In this area, there is a drive to develop new materials with improved properties. In this experiment we aim to investigate the structures of a range of new sulfate/chromate doped Ruddlesden Popper systems of interest as new cathode materials for such applications. A key aim is to investigate any ordering of the chromate/sulfate groups and improve our understanding of their accommodation in these technologically important structures.