Formation of dendrite domain structures in stoichiometric lithium niobate at elevated temperatures

Formation of the dendrite-type self-organized domain structures during polarization reversal at elevated temperatures (above 230°C) has been revealed and studied in stoichiometric lithium niobate LiNbO3 single crystals. Optical, confocal Raman, scanning electron, and piezoelectric force microscopy have been used for domain visualization. It has been shown experimentally that formation of the dendrite-like structures has been attributed to correlated nucleation caused by a field distribution in the vicinity of the charged domain walls. © 2012 American Institute of Physics

Sizes and fluorescence of cadmium sulfide quantum dots

Cadmium sulfide quantum dots have been synthesized by wet chemical deposition from an aqueous solution. The sizes of the quantum dots determined by dynamic light scattering directly in the colloidal solution and by intermittent-contact atomic force microscopy in the dry sediment agree with each other. It has been found that splitting of the fluorescence peaks of the quantum dots can be affected by the disorder of the atomic structure of cadmium sulfide quantum dots. © 2013 Pleiades Publishing, Ltd

Self-organized growth of dendrite domains in lithium niobate and lithium tantalate single crystals

The equipment of the Ural Center for Shared Use “Modern nanotechnology” UrFU was used. The research was made possible by Russian Science Foundation (Project №14-12-00826)

Electron beam poling of [001]c-poled PMN-39PT single crystal

The equipment of the Ural Center for Shared Use “Modern Nanotechnology” UrFU has been used. The research was made possible in part by Government of the Russian Federation (Act 211, Agreement 02.180 A03.21.0006) and RFBR (grant 17-52-80116-BRICS_a)

Charged domain walls in lithium tantalate with compositional gradients produced by partial VTE process

The morphology of a single charged domain wall, appeared under the action of composition gradients produced by partial VTE procedure by Cherenkov-type second harmonic generation microscopy, was observed in detail. The width of the charged domain wall was estimated as 70 μm. Non-through and through narrow domains, grown from the charged domain wall, were revealed. The maximum length of non-through domains with submicron diameter was about 100 μm. The growth of narrow domains from the charged domain wall was demonstrated and attributed to the action of pyroelectric field. The widening of domains occurred after achieving the polar surface. © Published under licence by IOP Publishing Ltd.Russian Science Foundation, RSF: 19-12-00210The equipment of Ural Centre for Shared Use “Modern Nanotechnology” Ural Federal University was used. The research was made possible by Russian Science Foundation (project № 19-12-00210)

Charged domain walls in lithium tantalate with compositional gradients produced by VTE process

The equipment of Ural Center for Shared Use “Modern Nanotechnology” Ural Federal University was used. The research was made possible by Russian Science Foundation (Project № 19-12-00210)

STUDY OF 3D-KINETICS OF DOMAIN STRUCTURE DURING POLARIZATION REVERSAL IN SBN SINGLE CRYSTALS BY SECOND HARMONIC GENERATION MICROSCOPY

The 3D domain structure kinetics in SBN single crystals was investigated. Domain imag-ing in the crystal bulk was realized by Čerenkov-type second harmonic generation micros-copy. Three types of domains have been revealed: domain with a broad domain boundary, cylindrical domain and conical domain.Благодарности: Исследование выполнено за счет гранта Российского научного фонда (проект № 19-72-00008). Использовано оборудование УЦКП «Современные нанотехнологии» УрФУ

INFLUENCE OF ELECTRIC FIELD ON INITIAL DOMAIN STRUCTURE IN LITHIUM TANTALATE WITH COMPOSITIONAL GRADIENT

The AC electric field has been applied to lithium tantalate with compositional gradient produced by vapor transport equilibration (VTE) procedure. Decay of the initial domain struc-ture accompanied by charged domain walls formation has been revealed.Работа выполнена с использованием оборудования УЦКП «Современные нанотехнологии» ИЕНиМ УрФУ. Исследование выполнено при финансовой поддержке РФФИ в рамках научного проекта 19-32-90050