96-18E

# 96-18E

By - Posted on 08 February 2012

UDC:
533, 536
PACS:
77.80.-e, 77.80.Bh, 77.84.Fa, 78.20.Fm, 78.20.Hp

Uniaxial pressure influence on phase transition and physical properties of highly deuterated K(H$_x$D$_{1-x})_2$PO$_4$-type ferroelectrics

I.V. Stasyuk
R.R. Levitskii
I.R. Zachek
A.S. Duda
A.P. Moina
M.O. Romanyuk
We performed experimental investigations of deuteration and uniaxial $p=-\sigma _3$ and $p=-\sigma _1$ mechanical stress influence on temperature and wavelength dependences of the birefringence and transition temperature of K(H$_x$D$_{1-x})_2$PO$_4$\ crystals. On the basis of the previously proposed model for a strained KD$_2$PO$_4$ crystal, we study the effects of uniaxial $p=-\sigma _3$ and $p=-\sigma _1=-\sigma _2$ pressures on the phase transition, thermal, dielectric and elastic properties of highly deuterated K(H$_x$D$_{1-x})_2$PO$_4$\ crystals. The obtained results are compared with available experimental data and earlier theoretical calculations, concerning the hydrostatic pressure effects.