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Figure 7
HS-POM images of the polycrystalline powders after milling for 30 min showing the change in polarization colour at different defect density zones during the heating process. (a) HS-POM image of the pure β form, (b)–(d) rapid first-step phase transition, (d)–(h) slow second-step phase transition [crystals in (h) are α form]. Defect areas are marked by red circles.

IUCrJ
Volume 8| Part 4| July 2021| Pages 584-594
ISSN: 2052-2525
https://doi.org/10.1107/S2052252521004401