Domains in KH<sub>2</sub>PO<sub>4</sub>

Bornarel, Jean

doi:10.1080/00150198708224840

Cited by 36 publications

(30 citation statements)

References 31 publications

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“…Such a domain structure seems to be quite stable, but some arrangements happen in the temperature interval of a few degrees below the transition temperature as noted in KDP studies. 33,36 The FP phase transition behaves in a similar way. The paraelectric phase nuclei appear in the sample corners ͓Fig.…”

Section: B Domain Structurementioning

confidence: 86%

“…Furthermore, it has already been suggested to add an additional term d which is the domain structure contribution. 33 This term depends on the density of the domain walls 2,33,36,39 and clearly on temperature as illustrated in Fig. 9.…”

Section: ͑6͒mentioning

confidence: 94%

“…For example, dielectric measurements may be simultaneously performed with diffraction of a laser beam to attempt the mean domain width. 36,37,40,41 Small electrical hysteresis cycles at a given temperature will be useful to ensure that the observed domain texture is the equilibrium one. 36 In the same way thermal cycles may be used to obtain similar results.…”

Section: ͑6͒mentioning

confidence: 99%

“…Optical observations of the domain texture performed simultaneously with dielectric measurements allowed us to demonstrate the domain contribution in the dielectric properties at low temperatures 29,34,35 as nearer the transition temperature. 33,36 This effect is known even if the variation law of this dielectric constant contribution of the domains versus the temperature must be clarified near the transition. Earlier studies during the phase coexistence of DKDP carried out under an external thermal gradient of about 0.2 K mm Ϫ1 confirm this contribution of the domains in the dielectric properties 25,26 and suggest also that the presence of the phase front in the crystal leads to an increase of its electric permittivity value.…”

Section: Introductionmentioning

confidence: 99%

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Phase front and domains during the paraelectric-ferroelectric transition inKD2PO4:Optical observation and dielectric contributions

Bornarel

Cach

1999

Phys. Rev. B

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Observations of the phase front and the domains during the paraelectric-ferroelectric KD 2 PO 4 phase have been performed in very good thermal homogeneity conditions ͑thermal gradient equal to 2ϫ10 Ϫ3 K mm Ϫ1 ). Simultaneously, dielectric and loss constants have also been measured. The phase fronts exhibit a quasiplanar shape perpendicular to the c ferroelectric axis. The ferroelectric region is quasimonodomain when its c dimension is lower than 100 m. The dielectric constant is demonstrated as the sum of three contributions: a monodomain mono Ј , a contribution of domains d Ј proportional to mono Ј with a coefficient depending on the domain texture, and a contribution due to the existence of the phase front during the phase coexistence.

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Section: B Domain Structurementioning

confidence: 86%

Section: ͑6͒mentioning

confidence: 94%

Section: ͑6͒mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Phase front and domains during the paraelectric-ferroelectric transition inKD2PO4:Optical observation and dielectric contributions

Bornarel

Cach

1999

Phys. Rev. B

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“…The abrupt decrease of the dielectric constant is then attributed to the freezing of domain walls. At least three models to describe this fieezing effect have been proposed: by those (1) Bornarel [14,18,22], (2) Fedosov and Sidorkin [15] and (3) Kuramoto and Nakamura [16,19,2 1,231. These models can explain some experimental results, but some questions are still open.…”

Section: Introductionmentioning

confidence: 99%