The crystal structure of martensitic ZrIr and ZrRh

The crystal structures of the martensitic shape memory alloys ZrIr and ZrRh have been determined using neutron powder diffraction data. These materials belong to a new structure type, space group Cmcm, Z = 8, with a = 3.3686(4) Å, b = 19.608(3) Å, c = 4.3982(5) Å for ZrIr and a = 3.3394(4) Å, b = 19.590(3) Å, c = 4.3940(5) Å for ZrRh.