A combinatorial nanoprecursor route for direct solid state chemistry: Discovery and electronic properties of new iron-doped lanthanum nickelates up to La4Ni2FeO10 − δ

► A new high-throughput combinatorial process for materials discovery is described. ► Layered lanthanum nickelates are formed directly, without the need for comminution. ► Fe is doped into Ruddlesden Popper type La4Ni3 − xFexO10 to a maximum of x = 1. ► DC electrical conductivity of all phase pure materials is reported.