Magnetic properties of La(${\mathrm{Fe}}_{\mathrm{x}}$${\mathrm{Al}}_{1\mathrm{-}\mathrm{x}}$${)}_{13}$ determined via neutron scattering and Mössbauer spectroscopy

La(${\mathrm{Fe}}_{\mathrm{x}}$ ${\mathrm{Al}}_{1\mathrm{-}\mathrm{x}}$ ${)}_{13}$ pseudobinary intermetallic compounds, which can be stabilized for 0.46<x<0.92, have been studied by neutron diffraction and Mössbauer spectroscopy. Neutron measurements on an antiferromagnetic x=0.91 sample at 4.2 K reveal a long-range-order antiferromagnetic state, consisting of ferromagnetic clusters, coupled antiferromagnetically. Mössbauer-effect measurements show a drop of the hyperfine field at the Fe nucleus at the ferromagnetic-antiferromagnetic phase boundary x≃0.88. Both these microscopic measurements indicate a transition from α-iron-like ferromagnetism to γ-iron-like antiferromagnetism due to the extremely high coordination of Fe atoms.