Size-driven ferroelectric effects in TGS induced by high hydrostatic pressure

The parameters P S , E c , ε and T C of TGS monocrystals were investigated under high hydrostatic pressure of up to 2.5 GPa. It has been found that above a critical pressure p c of about ≈ 1.8 GPa the derivative d T C d p starts to be negative and ferroelectricity disappears at about 2.5 GPa. The an...

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Bibliographic Details
Published in:Journal of non-crystalline solids 2010-06, Vol.356 (25), p.1305-1309
Main Authors: Stankowski, J., Waplak, S., Jurga, W., Krupski, M.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Critical pressure
Derivatives
Dielectric constant
Dielectric properties of solids and liquids
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Domain structure
hysteresis
Exact sciences and technology
Ferroelectricity
Ferroelectricity and antiferroelectricity
Hydrostatic pressure
Nanocomposites
Nanomaterials
Nanostructure
Permittivity
Permittivity (dielectric function)
Physics
Size effects
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Summary:The parameters P S , E c , ε and T C of TGS monocrystals were investigated under high hydrostatic pressure of up to 2.5 GPa. It has been found that above a critical pressure p c of about ≈ 1.8 GPa the derivative d T C d p starts to be negative and ferroelectricity disappears at about 2.5 GPa. The analysis of the reciprocal permittivity ε − 1 reveals that after the avalanche-type structure destruction the TGS samples show a relaxor-like behavior. It is suggested that polar nano-regions formed under high critical pressure mutually interact, in contrast to the case of a superparamagnetic. It is concluded that the TGS phase above 2.5 GPa may be referred to as a superparaelectric limit.
ISSN:0022-3093
1873-4812
DOI:10.1016/j.jnoncrysol.2010.04.013