The high-pressure phase IV of potassium dihydrogen phosphate (KH2PO4, KDP) has been determined at 1.62 GPa/296 K. It is monoclinic, space group P21/c, Z = 12, and on decompression transforms into monoclinic phase I. The interplay of OH
O bonding networks and K+ coordination types leads to an exceptionally large number of KDP polymorphs, at least 13 according to the literature.
Dalton Transactions
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