A new X-ray topographic defect contrast on swept quartz crystals

Sebastian, M. T.; Zarka, A.; Capelle, B.

doi:10.1107/s0021889888002614

Cited by 17 publications

(2 citation statements)

References 18 publications

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“…In this case, the intensity enhancement is reported to be due to the negative spacecharge collection (separation of the alkali charge compensators) which distort the crystal lattice (Sebastian, Zarka & Capelle, 1988;Sebastian & Klapper, 1990). In contrast to KTP and the ion conductors mentioned above, the field-induced intensity enhancement in quartz persists over several days after switching off the electric field and can be eliminated by X-ray irradiation.…”

Section: 2y-ray Topographymentioning

confidence: 99%

X-ray diffraction study of KTP (KTiOPO₄) crystals under a static electric field

Sebastian¹,

Klapper²,

Bolt³

1992

J Appl Cryst

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X-ray diffraction studies are made on ion-conducting potassium titanyl phosphate (KTP) crystals with in situ DC electric field along different crystallographic directions. The X-ray rocking curves recorded with an electric field along the polar b axis (which is the direction of ion conduction) show a strong enhancement of the 040 reflection intensity (reflecting planes normal to the b axis) whereas the hOl reflections (reflecting planes parallel to the polar axis) do not show any intensity change. For an electric field normal to the polar axis no intensity change, either in 040 or in hOl reflections, occurs. This observation is supplemented by X-ray topography. The 040 X-ray topographs recorded with in situ electric field along b exhibit strong extinction contrast in the form of striations parallel to the polar (ion-conduction) axis. The 040 intensity increase and the striation contrast are attributed to lattice deformation by the space-charge polarization due to the movement of the K ÷ ions under the influence of the electric field.

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Section: 2y-ray Topographymentioning

confidence: 99%

X-ray diffraction study of KTP (KTiOPO₄) crystals under a static electric field

Sebastian¹,

Klapper²,

Bolt³

1992

J Appl Cryst

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“…Synthetic crystals are generally twin free, since they are grown on untwinned seeds below the inversion point. The electric twins have been induced by mechanical stress 13-51, using intensity light beams [6,7], by passing through the transition point [8,9];an original method by thermal treatment in the temperature gradient of [10][11][12][13][14][15] function of direction, temperature, thickness for +SX resonator plates. In the second part of the paper the influence of the electric twins on the frequency spectrum and on the temperaturefrequency dependence is discussed.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of the dauphine twins in quartz crystal up to the transition point

Iliescu¹,

Enculescu²,

Chirilǎ

1997

Ferroelectrics

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The paper presents two original methods for obtaining electrical twins up to the transition point in quartz crystal: a) thermal treatment in a temperature gradient of 10-1.5 degreekm at about 5OO0C and b) applying an electric field of 14kVkm at 50OoC. The twinning time dependence on the temperature, the dynarmc of twin domain formation as a function of directions. thickness. temperature gradient, for +SX resonator plates are discussed. The influence of the Dauphine tuins on the performances of piezoelectric resonators: resonant frequency. dynamic inductance and equivalent dynamic capacity was previously reported [I].This paper presents the influence of twinning area on the frequency spectrum of a resonator plate of + 5 X a t and the changing of the frequency-temperature characteristic urhen the resomtor plate becomes minned.

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X‐ray Topographic Defects' Contrast on Synthetic Quartz

Chirilǎ

Csiki

1993

Cryst. Res. Technol.

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In the present study the linear defects in several synthetic quartz have been surveyed by X-ray topography using Lang method. The grown-in dislocations produced by layers displacement around holes, precipitates or inclusions are discussed. Each growth zone is described with their own defects pattern and some correlations with the external morphology of the crystal are stated. There are also pointed out the asymmetry of the defects for every growth zone and the specific role in the growth mechanism of the s-growth zone. In the final part of the work there are outlined the general and the specific conclusions.Dans l'ktude prksente sont analiskes les defaults lineaires dans quelques quartz de synthese par topographie avec rayons X, la mkthode Lang. Ainsi, sont discutkes les dislocations produit par le deplacement des plans cristallins autour de nus, de precipitations ou d'inclusions. Chaque secteur de croissance est dkcrit ayant sa propre structure de defaults qui ont ses implications dans la morphologie extkrieur de cristal-I1 est met en kvidence l'asymetrie de defauts pour chaque secteur de croissance et en meme temp le r61e particulier de secteur de croissance s dans la mkcanisme de croissance. A la fin de l'etude sont prksentkes les conclusions genkrales et spkcifiques.

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A new X-ray topographic defect contrast on swept quartz crystals

Cited by 17 publications

References 18 publications

X-ray diffraction study of KTP (KTiOPO₄) crystals under a static electric field

X-ray diffraction study of KTP (KTiOPO₄) crystals under a static electric field

Dynamics of the dauphine twins in quartz crystal up to the transition point

X‐ray Topographic Defects' Contrast on Synthetic Quartz

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A new X-ray topographic defect contrast on swept quartz crystals

Cited by 17 publications

References 18 publications

X-ray diffraction study of KTP (KTiOPO4) crystals under a static electric field

X-ray diffraction study of KTP (KTiOPO4) crystals under a static electric field

Dynamics of the dauphine twins in quartz crystal up to the transition point

X‐ray Topographic Defects' Contrast on Synthetic Quartz

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Product

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X-ray diffraction study of KTP (KTiOPO₄) crystals under a static electric field

X-ray diffraction study of KTP (KTiOPO₄) crystals under a static electric field