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Figure 2
The calculated PDF from the average structure at 300 K (Forrester et al., 2006BB10; Kisi et al., 2006BB15; Terado et al., 2006BB31) compared with the 300 K PDF data obtained using (a) X-rays and (b) neutrons. The label `a' indicates the lattice a parameter, which includes Pb—Pb, B-site—B-site and O—O atom pairs. Asterisks * indicate the B-site—O peaks (denoted B—O) in the neutron data in part (b). The arrows in part (b) show the peaks corresponding to the different Pb—O distances that result from displacement of Pb2+ towards the nearest O atoms.

IUCrJ
Volume 3| Part 1| January 2016| Pages 20-31
ISSN: 2052-2525
doi:10.1107/S2052252515018722