Measurements of propagation velocity of ultrasonic wave at a frequency of 10 MHz in pure and deuterated KDP single crystals
Abstract
The results of determination of all elastic constants of a KH_2PO_4 single crystal (KDP), and in the case of KD_{2x}H_{2(1-x)}PO_4 crystals (DKDP) of constants C_{66} i C_{11} and the temperature dependence of the constant C66 at a frequency of 10 MHz are reported. The measurements showed an effect of deuteration on the constant C_{11} and on the change of the temperature dependence of C_{66} in the phase transition region.References
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[2] S. HAUSSUHL, Elastische und thermoelastische Eigenschaften von KH2PO2, KH2AsO4, NH4H2PO4, NH4H2AsO4, und RbH2PO4, Zeit. Kristall. Bd. 120, 401-414 (1964).
[3] LANDOLT-BORNSTEIN,, Numerical data and functional relationships in science and technology, Group III: Crystals and solid state physics, Springer-Verlag, Berlin–Heidielberg 1966.
[4] E. LITOV, E. A. UEHLING, Polarization relaxation in the ferroelectric transition region of KD2PO4, Phys. Rev. Letters, 21, 12, 809-812 (1968).
