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(a) Fit of the α-[Mo8O26] cluster structure to the d-PDF obtained from the sample with 15% Mo. (b) Fit of the best-fitting α-[Mo8O26]-derived cluster structure. (c) Fit of the β-[Mo8O26] cluster structure to the d-PDF. (d) Fit of the best-fitting β-[Mo8O26]-derived cluster structure. In all fits, the experimental PDF is displayed as blue dots, the calculated model as a red line and the difference curve as a green line.
