Abstract
The topotactic reduction of La 1− x Sr x MnO 3 (0.2< x<0.4) perovskite phases to the corresponding La 1− x Sr x MnO 2.5 brownmillerite phases with NaH is described. Neutron and electron diffraction data show the x = 0.25 and 0.2 phases adopt structures with an unusual ordered L–R–L–R alternation of twisted chains of Mn(II) tetrahedra within each anion-deficient layer. This is accompanied by Mn(II)/(III) charge ordering within the remaining MnO 6 octahedral layers. In contrast, the x = 0.4 phase adopts a structure in which the twisted chains of tetrahedra are disordered.
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