0000000000172092

AUTHOR

V. T. Kalinnikov

showing 3 related works from this author

Physical and Chemical Principles of Obtaining Thermally Resistant Containers for Treatment of High Purity Niobium and Tantalum Compounds

2011

Mathematical modelling of the distribution of strain in layered quartz ceramics with protective coating of niobium (tantalum) pentoxide from two sides is reported. It is found that fragmentation of the basic layer (decreasing the area of the continuous boarder between layers) and smoothing of sharp edges of the base fragments should reduce the strains on the boundary between the substrate and coating and, correspondingly, enhance the thermal resistance of the samples. Treatment of the niobium pentoxide coating by concentrated light induces a network of fractal micro- and nano-size fractures that compensates the difference of thermal expansion between the layers.

Materials scienceThermal resistanceTantalumNiobiumchemistry.chemical_elementengineering.materialCondensed Matter PhysicsThermal expansionElectronic Optical and Magnetic Materialschemistry.chemical_compoundCoatingchemistryvisual_artvisual_art.visual_art_mediumengineeringPentoxideCeramicNiobium pentoxideComposite materialFerroelectrics
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Storage of information in lithium niobate single crystals

2011

Reported studies of recording information were made with a number of LiNbO 3 compositions: stoichiometric and congruent single crystals. The present study shows that recording is possible in pure LiNbO 3 single crystals and in single crystals containing inactive cation dopants. Recording in stoichiometric crystals is likely possible because of a considerable amount of electrons localised in shallow traps. Absence of recorded information in pure congruent crystals were observed.

Crystallographychemistry.chemical_compoundOptical imagingMaterials scienceDopantchemistryOptical recordingLithium niobateNonlinear opticsIntegrated opticsElectronStoichiometry2011 International Symposium on Applications of Ferroelectrics (ISAF/PFM) and 2011 International Symposium on Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials
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Effects of Ionising Radiation on Optical Properties of Lithium Niobate Single Crystals

2005

Studies of thermal and γ-irradiation effects on the optical properties in congruent lithium niobate single crystals containing Mg and Gd dopants including samples with double dopants Y, Mg are reported. Formation of defects at irradiation and thermal treatment of the samples is explored by analysis of the behaviour of electron absorption spectra. Considerable increase of absorption with the dose of γ-radiation is observed at 500 nm. The changes of absorption examined under different conditions are explained by creation and destruction of Nb 4+ defects.

Materials scienceDopantLithium niobateAnalytical chemistryThermal treatmentCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsIonizing radiationchemistry.chemical_compoundchemistryElectron absorptionThermalIrradiationAbsorption (electromagnetic radiation)Ferroelectrics
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