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(a–c) OM images and (d–f) PXRD patterns of the PCA crystals produced by batch cooling crystallization (a,d) without an additive, and at (b,e) 20 wt% and (c,f) 50 wt% of FUM under no agitation in the 0.5 L vessel (scale bar = 200 μm). The characteristic diffraction peaks of Form I PCA, Form II PCA, and FUM are labeled by ☐, ✴, and +, respectively.
