translate English to French: Quasielastic neutron scattering (QNS) suggests that in phase III there are two sublattices of cations, one of which becomes completely disordered (with respect to the NH3 rotors) at the III–II phase transition.
La diffusion des neutrons quasi-élastiques (DNQ) suggère que, dans la phase III, il existe deux sous-réseaux de cations dont l'un devient complètement désordonné (par rapport aux rotors NH3) lors de la transition phase III → II.