On the Anomalous Increase of the Permittivity during Slow Switching Processes in Triglycine Sulphate

Fousek, J.; Málek, Z.; Salim, Ahmed; Ali, N.

doi:10.1088/0370-1328/80/5/120

Cited by 3 publications

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“…[1,2] While there exist a number of such data for ceramic materials [1,3,4], information for single crystals is rather scarce. Understandably, for nonferroelastic ferroelectrics such as TGS only data on ∆ε are available; [5] on the other hand for crystals which are both ferroelectric and ferroelastic with more than two domain states, dense domain systems are rather chaotical, difficult to approach theoretically. In the present paper, we have in mind ferroelectric and ferroelastic crystals with only two domain states.…”

Section: Introductionmentioning

confidence: 99%

Extrinsic contributions in a nonuniform ferroic sample: Dielectric, piezoelectric and elastic

2001

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The contribution ∆ε of extremely small motions of domain walls to small-signal permittivity of a multidomain ferroelectric sample has been a research issue for many years. In ferroelastic ferroelectrics such motions contribute also to their piezoelectric (by ∆d) and elastic (by ∆s) properties.Data about their simultaneous existence are scarce but those available point to mutual proportionality of ∆ε, ∆d and ∆s, as expected. To understand the magnitude of extrinsic contributions, the origin of the restoring force acting on domain walls must be understood. In the present contribution the theory has been developed based on the model of a plate-like sample in which the ferroelectric-ferroelastic bulk is provided with a nonferroic surface layer. Motion of domain walls in the bulk results in a change of electric and elastic energy both in the bulk and in the layer, which provides the source of restoring force. This makes it possible to determine all mentioned extrinsic contributions. We discuss the applicability of the model to available data for single crystals and also for ceramic grains.PACS numbers:

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