Some Dielectric and Optical Properties of KD2PO4

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Abstract
The Curie point of KD2PO4 is found to be 222°±1°K, which is 9°K higher than previously reported. It is believed that the higher value is due to more complete deuteration. Other physical properties (at room temperature unless otherwise noted) are as follows: dielectric constant from 208° to 300°K; contour shearmode resonance‐frequency constant from 270° to 320°K; elastic compliance, s66E=165±3×10−12 m2/N; piezoelectric constant, d36=58±2×10−12 C/N; electromechanical coupling, k36=0.22±0.01; optical absorption between 200 and 2600 mμ for both KD2PO4 and KH2PO4 (the transmission of a 7.4‐mm‐thick KD2PO4 sample was greater than 50 percent from 400 to 1850 mμ); zero stress electro‐optic coefficient, r63=26.4±0.7×10−12 m/V; lattice constants for both KD2PO4 and KH2PO4; and spontaneous polarization and coercive field from 150° to 222°K.