DOI:10.5488/CMP.15.33705 arXiv:1210.2226
Title:
Longitudinal relaxation of mechanically clamped KH2PO4 type crystals
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) |
Within the framework of a modified proton ordering model of the KH2PO4 family ferroelectric crystals, taking into account a linear over the strain ϵ6 contribution into the proton system energy, we obtain an expression for longitudinal dynamic dielectric permittivity of a mechanically clamped crystal using the four-particle cluster approximation and the dynamic Glauber approach. At a proper choice of the model parameters, we obtain a good quantitative description of available experimental data for these crystals.
Key words:
ferroelectric, cluster approximation, dielectric permittivity, relaxation times
PACS:
77.84.-s, 77.22.-d, 77.80.-e, 77.22.Ch
| Full text [pdf, ps] | << List of papers |