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Your search keyword '"Shkerin, S.N."' showing total 11 results
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11 results on '"Shkerin, S.N."'

5. Raman and Photoluminescence Spectra for Ho, Er, Tm, Yb, Lu, and Y doped Hafnia

Author

null Abdurakhimova R.K., null Yaroslavtseva T.V., null Meshcherskikh A.N., and null Shkerin S.N.

Abstract

Previously obtained and certified HfO2 based samples were investigated by two Raman spectrometers with different wave source. Stokes reflexes have to be independent of the laser frequency so they were distinguished by comparison of different laser results. For the first time the dependence of Stokes lines frequencies on the cation radii of dopants was observed. Frequencies monotonically varied with the ratio of cation-dopant to hafnium radii changes. All non-Stokes reflexes are considered as photoluminescence. They were compared with both the literature data on luminescence of REM cations and the experimental results on zirconia-based materials intrinsic photoluminescence, which was a property of its point defects. Intrinsic photoluminescence is observed for the first time on hafnia-based materials. Keywords: Raman spectroscopy, luminescence, hafnia with cubic structure, REE.

Published
2022

11. Conductivity and structure features of Ce1−x Gd x O2−δ solid electrolytes fabricated by compaction and sintering of weakly agglomerated nanopowders

Author

Ivanov, V.V., Khrustov, V.R., Kotov, Yu.A., Medvedev, A.I., Murzakaev, A.M., Shkerin, S.N., and Nikonov, A.V.

Subjects
*CESIUM, *GADOLINIUM, *CERAMICS, *CARBON dioxide, *POWDER metallurgy
Abstract

Abstract: The conductivity and structure features of Ce1−x Gd x O2−δ ceramics prepared using weakly agglomerated nanopowders with the average particle size of about of 15nm are discussed. The powders were synthesized by the evaporation of coarse-grained target with the use of pulsed CO2-laser radiation. The magnetic pulsed compaction method was applied to press a dry nanopowder to densities up to 55% of theoretical one. Owing to high activity of the starting powder and uniformity of the compacts, the sintering of ceramics up to near full density was realized in non-conventionally low temperature range of 1100–1300°C. The structure of sintered ceramics with average grain sizes from the range of 100–300nm was investigated by X-ray analysis and microscopy methods (AFM, SEM). The structure features are discussed in interrelation with the data on conductivity of ceramics. The significant deviation in lattice parameter of elementary cubic cell for sintered fine-grained ceramics as compared with the known data for conventional coarse-grained material was revealed. [Copyright &y& Elsevier]

Published
2007
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