DOI:10.5488/CMP.12.1.75
Title:
Thermodynamics and dynamical properties of the KH2PO4 type ferroelectric compounds. A unified model
Author(s):
| R.R. Levitskii (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii Str., 79011 Lviv, Ukraine) , | |
| I.R. Zachek (Lviv Polytechnic National University, 12 Bandera Str., 79013 Lviv, Ukraine) , | |
| A.S. Vdovych (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii Str., 79011 Lviv, Ukraine) , | |
| S.I. Sorokov (Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 1 Svientsitskii Str., 79011 Lviv, Ukraine) |
Within the framework of the proposed unified proton ordering model for the ferroelectric compounds of the KH2PO4 family, in the four-particle cluster approximation for the short-range interactions and mean field approximation for the long-range interactions, we calculate thermodynamic and longitudinal dynamic characteristics of the KD2PO4 type ferroelectrics and ND4D2PO4 type antiferroelectrics. Calculations for partially deuterated K(H1-xDx)2PO4 type ferroelectrics and N(H1-xDx)4(H1-xDx)2PO4 type antiferroelectrics are performed within the mean crystal approximation. It is shown that at the proper choice of the theory parameters, a good quantitative description of experimental data for the KH2PO4 family crystals is obtained.
Key words:
ferroelectrics, cluster approximation
PACS:
77.22.Ch, 77.22.Gm, 77.84.Fa
Comments: Figs. 32, Refs. 275, Tabs. 5
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