Elastic Properties of KH2PO4 at the ferroelectric phase transition

A. E. Petrova; S. M. Stishov

doi:10.1016/j.ssc.2013.07.029

paper

Elastic Properties of KH2PO4 at the ferroelectric phase transition

arXiv:1310.3999 · doi:10.1016/j.ssc.2013.07.029

Abstract

We report results of ultrasonic studies of a single crystal of KDP in the temperature range 2-300 K. The longitudinal and transverse sound velocities along [001] and [100] directions were obtained as functions of temperature. The analysis of the temperature evolution of pseudomoduli $c_{11}$ and $c_{33}$ in the ferroelectric phase shows that these quantities can be approximated by the expression $c_{ii} \sim (T - T_{0})^{0.5}$ in the temperature range 0.001K $< T_{c} - T <$ 0.2K.