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Figure 5
(a) Portion of the raw PND at 685°C (above), highlighting continued presence of the X-point peaks (arrowed) above TC, together with the corresponding region at 1000°C. (b) Corresponding Rietveld fit using the P4/mbm model. (c) Corresponding Rietveld fit at 1000°C (I4/mmm model): the peak at d ≃ 2.40 Å is a Bi2Ti2O7 impurity due to partial decomposition under these conditions.

IUCrJ
Volume 6| Part 3| May 2019| Pages 438-446
ISSN: 2052-2525
https://doi.org/10.1107/S2052252519003804