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LOCALIZATION OF B3+ CATIONS IN THE LiNbO3 CRYSTAL STRUCTURE AND ITS EFFECT ON THE CRYSTAL PROPERTIES

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Abstract

It is shown that B3+ ions can embed in trace amounts into the faces of the oxygen tetrahedra in the LiNbO3 crystal structure (the faces bordering the lithium octahedron or the vacant oxygen octahedra) or into the oxygen plane separating oxygen-octahedral layers. By interacting with the oxygen atoms of octahedra O6, B3+ ions substantially distort the anionic framework of the crystal structure and change the octahedra′s polarizability determining nonlinear optical properties of the crystal. The structural units of the cationic sublattice in B3+ containing crystals are ordered along the polar axis while the Li/Nb ratio increases due to the reduced concentration of NbLi point defects serving as deep electronic traps. It is shown that the B2O3 flux (an active complexing agent) significantly changes the properties of the charge and those of the melt so that the melt acquires some specific structure, while the Curie temperature of the crystals increases.

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Funding

The reported study was partially funded by RFBR, project number 19-33-90025.

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Correspondence to R. A. Titov.

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Translated from Zhurnal Strukturnoi Khimii, 2021, Vol. 62, No. 2, pp. 235-243 https://doi.org/10.26902/JSC_id68329 .

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Sidorov, N.V., Titov, R.A., Voskresenskiy, V.M. et al. LOCALIZATION OF B3+ CATIONS IN THE LiNbO3 CRYSTAL STRUCTURE AND ITS EFFECT ON THE CRYSTAL PROPERTIES. J Struct Chem 62, 221–229 (2021). https://doi.org/10.1134/S0022476621020050

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  • DOI: https://doi.org/10.1134/S0022476621020050

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