Rotational Striations and Diffusion in Barium Sodium Niobate Crystals | Zendy

Aleksandrovskii A.L. | Zendy; Naumova I.I. | Zendy; Posmykiewicz P. | Zendy

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Rotational Striations and Diffusion in Barium Sodium Niobate Crystals

Author(s) -

Aleksandrovskii A.L.,

Naumova I.I.,

Posmykiewicz P.

Publication year - 1982

Publication title -

crystal research and technology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.377

H-Index - 64

eISSN - 1521-4079

pISSN - 0232-1300

DOI - 10.1002/crat.2170170508

Subject(s) - materials science , barium , diffraction , annealing (glass) , ferroelectricity , diffusion , anisotropy , optics , bragg's law , melting point , rotational diffusion , mineralogy , condensed matter physics , crystallography , chemistry , optoelectronics , thermodynamics , dielectric , composite material , physics , metallurgy

The possibility of inducing rotational growth striae with a small period in barium sodium niobate crystals (BSN) is examined. Crystals grown had a period stability up to 1 percent and were suitable material for anisotropic light diffraction by ferroelectric domains. However intense striae were produced only for periods λ > 5 m̈m. With the help of Bragg optical diffraction by growth striae the diffusion coefficient D in solid phase responsible for striae smoothing during annealing was measured. The magnitude D ≈ 10 ‐11 cm 2 s ‐1 at the melting point was obtained. Such D value leads to the vanishing of striae with λ < 5 m̈m in BSN crystals during growth.

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