Longitudinal Field Influence on the Phase Transition and Physical Properties of the Kh2po4 Family Ferroelectrics

Details Longitudinal Field Influence on the Phase Transition and Physical Properties of the Kh2po4 Family Ferroelectrics Longitudinal Field Influence on the Phase Transition and Physical Properties of the Kh2po4 Family Ferroelectrics

2000-08-22

arxiv.org/abs/cond-mat/0008314v1

Physics

Condensed Matter

Materials Science

18 pages, 7 figures in EPS format

Scientific paper

We verify whether the previously developed model of a KD2PO4 crystal, with the shear strain eps6 taken into account, is able to describe the longitudinal electric field E3 influence on the KH2PO4 family ferroelectrics. Major effects of the strain eps6 are splitting of the Slater energies of the short-range correlations and the effective field created by piezoelectric coupling. Calculated TC-E3 phase diagrams, field dependences of polarization, susceptibility, and elastic constant of deuterated KD2PO4 and pure KH2PO4 well accord with the available experimental data. For a consistent description of all dielectric and piezoelectric characteristics of the crystals, phonon degrees of freedom must be taken into account.

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