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Temperature dependences of the dielectric constant along the ferroelectric c-axis have been measured at various pressures up to 7. 9 GPa in KH2PO4 and KD2PO4. The vanishing of the ferroelectric state has been observed at 1. 7 GPa in KH2PO4 and at 6. 3 GPa in KD2PO4. The Curie constant C of KH2PO4 is almost independent of pressure. On the other hand, that of KD2PO4 above 4 GPa decreases about three fourths of that at atmospheric pressure. The crossover of the order-disorder type to the displacive one under high pressure is discussed on the mechanism of phase transition to explain these experimental results of KD2PO4.

Hydrogen Bonding. Pressure Effect on Hydrogen-Bond Ferroelectrics KH2PO4 and KD2PO4.