80 research outputs found
Nanodomain structures formation during polarization reversal in uniform electric field in strontium barium niobate single crystals
We have studied the ferroelectric nanodomain formation in single crystals of strontium barium niobate Sr 0.61Ba 0.39Nb 2O 6 using piezoelectric force microscopy and Raman confocal microscopy. The nanodomain structures have been created by application of the uniform electric field at room temperature. Four variants of nanodomain structure formation have been revealed: (1) discrete switching, (2) incomplete domain merging, (3) spontaneous backswitching, and (4) enlarging of nanodomain ensembles. Kinetics of the observed micro- and nanodomain structures has been explained on the basis of approach developed for lithium niobate and lithium tantalate crystals. © 2012 American Institute of Physics
Synthesis and Cytotoxic Effect of 1-Aryl-Substituted-6-Imino-2,7-Dioxabicyclo[3.2.1]Octane-4,4,5-Tricarbonitriles
The work was carried out within the framework of scholarship SP-127.2016.4 from the President of the Russian Federation for young scientists and graduate students
Nanodomain structures formation during polarization reversal in uniform electric field in strontium barium niobate single crystals
We have studied the ferroelectric nanodomain formation in single crystals of strontium barium niobate Sr 0.61Ba 0.39Nb 2O 6 using piezoelectric force microscopy and Raman confocal microscopy. The nanodomain structures have been created by application of the uniform electric field at room temperature. Four variants of nanodomain structure formation have been revealed: (1) discrete switching, (2) incomplete domain merging, (3) spontaneous backswitching, and (4) enlarging of nanodomain ensembles. Kinetics of the observed micro- and nanodomain structures has been explained on the basis of approach developed for lithium niobate and lithium tantalate crystals. © 2012 American Institute of Physics
Tip-induced domain growth on the non-polar cuts of lithium niobate single-crystals
Currently, ferroelectric materials with designed domain structures are considered as a perspective material for new generation of photonic, data storage, and data processing devices. Application of external electric field is the most convenient way of the domain structure formation. Lots of papers are devoted to the investigation of domain kinetics on polar surface of crystals while the forward growth remains one of the most mysterious stages due to lack of experimental methods allowing to study it. Here, we performed tip-induced polarization reversal on X- and Y-non-polar cuts in single-crystal of congruent lithium niobate which allows us to study the forward growth with high spatial resolution. The revealed difference in the shape and length of domains induced on X- and Y-cuts is beyond previously developed theoretical approaches used for the theoretical consideration of the domains growth at non-polar ferroelectric surfaces. To explain experimental results, we used kinetic approach with anisotropy of screening efficiency along different crystallographic directions. © 2015 AIP Publishing LLC
Nanodomain structures formation during polarization reversal in uniform electric field in strontium barium niobate single crystals
Исследование возможности регенерации иода из газовых потоков при иодидном рафинировании
The article considers the possibility of recovering elemental iodine vapor from the waste gas in the zirconium refining section Carbon sorbents of various types produced in Russia were used for the refining. The sorbents were tested in laboratory units and directly in the production area. The optimal sorbent kind was found. The characteristics of iodine recovery from saturated sorbents were determined. Recommendations on the filter design are givenРассмотрена возможность улавливания паров элементарного иода из отходящих газов участка рафинирования циркония угольными сорбентами различных типов российского производства. Испытания сорбентов проведены на лабораторных установках и непосредственно на производственном участке. Подобран оптимальный вид сорбента. Определены показатели извлечения иода из насыщенных сорбентов. Выданы рекомендации конструкции фильтра
Light emission in the agglomeration of silver clusters
Small noble-gas droplets are generated by adiabatic expansion and travel over a heated crucible where evaporated Ag atoms are picked up. The subsequent agglomeration of these Ag atoms to clusters is associated with light emission. This effect is caused by the gain in binding energy by the clustering process leading to the ejection, preferably, of excited trimers. The heat released by condensation and coagulation of the Ag atoms on the droplets causes continuous evaporation of the noble-gas atoms, so that under suitable conditions even light emission from the decay of free Ag3∗ species could be observed and analyzed
Fluorescence spectroscopy of silver clusters formed in rare gas droplets
The Pick Up technique allows continuous formation of high density metal
cluster beams in the otherwise hardly accessible size range Me2 to
about
Me50. With an apparatus based on the use of cryo-condensation
pumps, Ar as
inert gas for production of the host clusters by adiabatic expansion and
silver as metal we demonstrate how the various source parameters
influence
the composition and mean size of the resulting cluster distributions.
The
analysis in the gas phase by means fluorescence spectroscopy allows to
conclude that an Ar shell encapsulates the metal clusters
The influence of star-like palladium nanocrystallites on the gas transport parameters of modified palladium-containing membranes
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