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Figure 5
Comparison of the PDF data collected for ACP and brushite, and different considered backgrounds: CaCl2, Na2HPO4 and deionized water. The first two peaks in the ACP and brushite data represent mainly the P–O and Ca–O distances, with some O–O contributions. The PDF profiles for CaCl2·H2O and Na2HPO4 have similar locations for these initial peaks, but ACP and brushite also contain structure that is not inherited from the reactant solutions. The water PDF does not have a peak in the same location as peaks in ACP and brushite, ensuring that no signal from the sample is accidentally subtracted.

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