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Figure 5
(a) Measured diffraction patterns before illumination (black), after 10 min of illumination (red) and after another 30 min of illumination (blue). The data are shifted vertically for visibility. Panels (b) and (c) show details of diffraction maximum 220 after the first and second illuminations. The diffraction profiles of individual maxima after illumination are broadened and asymmetrical, and this effect gradually relaxes when the sample is kept in the dark. The peak denoted by an asterisk belongs to PbI2 impurity.

Journal logoJOURNAL OF
APPLIED
CRYSTALLOGRAPHY
ISSN: 1600-5767
Volume 59| Part 3| June 2026| Pages 879-888
https://doi.org/10.1107/S1600576726002475
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