(a) Neutron PDF data of annealed A48 (annealed for 48 h) and A240 (annealed for 240 h) and nonannealed FC (fast cooled) and SC (slow cooled) LiNi_0.5Mn_1.5O₄ samples. (b) Structure of the ordered^[7] LiNi_0.5Mn_1.5O₄ (S.G. P4₃32) polymorph viewed along the [{110}] direction. All oxygen atoms are omitted for clarity. (c) Least-squares refinements of the disordered (S.G. Fd3¯m ) and ordered (S.G. P₄332) structure models using local PDF data of the disordered LiNi_0.5Mn_1.5O₄ sample, which has local Ni/Mn ordering in the short-range (agrees well with the ordered model), and long-range Ni/Mn disordering (agrees well with the disordered model).^[59]