Abstract
The Hartman-Perdok theory enables one to establish the order of morphological importance of the ADP (NH4H2PO4) crystal faces from its crystal structure. Periodic Bond Chains (PBC's) have been obtained using the N−HN…O strong bonds between the ionic [NH4]+ and [H2PO4]- crystallization units. The PBC's are parallel to 100, [001],
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