Phase transitions in KH2PO4 (KDP) and RbH2PO4 (RDP) at room temperature for pressures up to 14 GPa have been determined by means of capacitance measurements using a diamond anvil cell. Phase transitions occur in KDP near 2.5 and 7.0 GPa. In RDP, a transition was detected near 5.4 GPa.
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Bao et al. (1991) studied this question.
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