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Electrogyration effect
in lead germanate crystal family.
1. Electrogyration in the solid
solutions based on lead germanate crystals
1,2Shopa Y., 2Adamenko
D., 2Vlokh R., 2Vlokh O.
Shopa Y.1,2, Adamenko D.2, Vlokh R.2 and Vlokh O.2
1Ivan
Franko National University of Lviv, 8 Kyrylo and Mefodiy St., 79005 Lviv,
Ukraine
2Institute
of Physical Optics, 23 Dragomanov St., 79005 Lviv, Ukraine
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Keywords: electrogyration, ferroelectric phase
transition, optical activity, lead germanate crystals, phase diagram
PACS: 33.55.Ad, 78.20.Jq, 78.20.Ek, 77.80.-e
Ukr. J. Phys. Opt.
8 197 - 208
doi: 10.3116/16091833/8/4/197/2007
Received: 01.10.2007
We present the results of studies of electrogyration effect in the solid
solutions Pb5(Ge(1-x)Six)3O11
and
(Pb(1-x)Bax)5Ge3O11.
We show that substitutions of Pb with Ba and Ge with Si do not lead to
the changes in electrogyration coefficients, defined in the units of reciprocal
electric polarization. At the same time, the main contribution to the changes
in electrogyration coefficients, defined in the units of reciprocal electric
field strength, is given by critical behaviour of the dielectric permittivity
in the vicinity of Curie temperature. It follows from a simple thermodynamic
analysis that a hypothetical tricritical point can exist on the x,T-phase
diagram for the solid (Pb(1-x)Bax)5Ge3O11
solutions.
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