Assertion: oxalic acid's form | /r/HasProperty | given in morphological study
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text: + (Lewis acid–base interaction) and formed a complex as confirmed from FTIR and NMR analyses (a schematic showing the probable interaction, which controls the crystallization of the perovskite, is given in The morphological study was performed with a field emission scanning electron microscope (FESEM) to understand the effect of OA addition, as shown in Figures 3 a,b and S1 .