Fig. 2: Strategies for the elucidation of the Mo/Nb order and complete crystal structure of Ba7Nb4MoO20ยท0.15 H2O.

a Combined technique to determine the crystal structure and Mo/Nb order of Ba7Nb4MoO20ยท0.15 H2O. b Refined crystal structure showing the M1, M2, M3 and M4 sites of Mo and Nb atoms in Ba7Nb4MoO20ยท0.15 H2Oย where the Mo and Nb atoms are assumed to be completely disordered.