Pub Date : 2012-09-01DOI: 10.1109/OMEE.2012.6464758
A. Lazarescu, E. Melnic, V. Kravtsov, C. Turta
The heterometallic, single-source precursor with formula {[CoSr(2,3-pdc)2(H2O)5]·3H2O}n (1), has been synthesized and investigated by elemental analysis, IR-spectroscopy, thermal analysis (TGA) and single crystal X-ray diffraction. The compound 1 crystallizes in the triclinic space group P−1 and is self-organized in a polymeric structure of 2D dimension. Thermal decomposition of 1 leads to the formation of oxygen-deficient perovskite SrCoO2.52, as is determined by powder X-ray diffraction.
{"title":"Heteronuclear (Co-Sr) 2,3-pyridinedicarboxylate complex as precursor to the oxygen-deficient perovskite SrCoO2.52","authors":"A. Lazarescu, E. Melnic, V. Kravtsov, C. Turta","doi":"10.1109/OMEE.2012.6464758","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464758","url":null,"abstract":"The heterometallic, single-source precursor with formula {[CoSr(2,3-pdc)<inf>2</inf>(H<inf>2</inf>O)<inf>5</inf>]·3H<inf>2</inf>O}<inf>n</inf> (1), has been synthesized and investigated by elemental analysis, IR-spectroscopy, thermal analysis (TGA) and single crystal X-ray diffraction. The compound 1 crystallizes in the triclinic space group P−1 and is self-organized in a polymeric structure of 2D dimension. Thermal decomposition of 1 leads to the formation of oxygen-deficient perovskite SrCoO<inf>2.52</inf>, as is determined by powder X-ray diffraction.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"7 1","pages":"299-300"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78609741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-09-01DOI: 10.1109/OMEE.2012.6464800
V. Harutyunyan, E. Aleksanyan, E. Hakhverdyan, N. Grigoryan, V. Baghdasaryan, V. Makhov, M. Kirm
The excitations of luminescence in irradiated and non-irradiated ruby crystals are investigated by means of highly polarized synchrotron radiation. In the VUV luminescence spectra the existence of quick and slow emission was observed in irradiated and nonirradiated crystals. The luminescence bands with maximum at 3.8 eV are produced by F+ centers. A new type of quick luminescence was established for the band at 4.6 eV. It is called cross-luminescence and is connected with the recombination of valence band electrons with holes in low-lying core levels. It is shown that the band at 3.0 eV is not due to anionic centers (F-centers), but is determined by a short lifetime emission center.
{"title":"Luminescence and radiation defects in irradiated ruby","authors":"V. Harutyunyan, E. Aleksanyan, E. Hakhverdyan, N. Grigoryan, V. Baghdasaryan, V. Makhov, M. Kirm","doi":"10.1109/OMEE.2012.6464800","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464800","url":null,"abstract":"The excitations of luminescence in irradiated and non-irradiated ruby crystals are investigated by means of highly polarized synchrotron radiation. In the VUV luminescence spectra the existence of quick and slow emission was observed in irradiated and nonirradiated crystals. The luminescence bands with maximum at 3.8 eV are produced by F+ centers. A new type of quick luminescence was established for the band at 4.6 eV. It is called cross-luminescence and is connected with the recombination of valence band electrons with holes in low-lying core levels. It is shown that the band at 3.0 eV is not due to anionic centers (F-centers), but is determined by a short lifetime emission center.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"26 1","pages":"172-173"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85455145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-09-01DOI: 10.1109/OMEE.2012.6464899
M. Omelchenko, M. Panasyuk, V. Kapustianyk
We report the data concerning investigations of photoluminescence spectra of ZnO nanoparticles in the matrixes of liquid crystal materials performed at T = 290 K within a visible region. The mentioned spectra were obtained at polymeric state of Cetylpyridinium Chloride and Disodium Cromoglycate materials.
{"title":"Photoluminescence of ZnO nanocrystals at Cetylpyridinium Chloride and Disodium Cromoglycate matrices","authors":"M. Omelchenko, M. Panasyuk, V. Kapustianyk","doi":"10.1109/OMEE.2012.6464899","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464899","url":null,"abstract":"We report the data concerning investigations of photoluminescence spectra of ZnO nanoparticles in the matrixes of liquid crystal materials performed at T = 290 K within a visible region. The mentioned spectra were obtained at polymeric state of Cetylpyridinium Chloride and Disodium Cromoglycate materials.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"1 1","pages":"205-206"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88294799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-09-01DOI: 10.1109/OMEE.2012.6464784
E. Fertman, V. Desnenko, S. Dolya, M. Kajňaková, A. Feher
We have revealed a giant exchange bias (EB) in a colossal magnetoresistance Nd2/3Ca1/3MnO3 manganite at low temperatures, evident of its intrinsic interface exchange coupling. The phenomenon found confirms our previous assumption that the low temperature magnetic structure of the compound is represented by small (nano-sized) ferromagnetic clusters immersed within the charge-ordered antiferromagnetic matrix. Magnetic behavior of the Nd2/3Ca1/3MnO3 perovskite at low temperature is consistent with its cluster-glass magnetic state originating from the self-organized phase separation. Slow relaxation of zero-field-cooled magnetization has been experimentally revealed as well. It confirms the cluster glass magnetic state of the compound.
{"title":"Giant exchange bias in nano phase-segregated Nd2/3Ca1/3MnO3","authors":"E. Fertman, V. Desnenko, S. Dolya, M. Kajňaková, A. Feher","doi":"10.1109/OMEE.2012.6464784","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464784","url":null,"abstract":"We have revealed a giant exchange bias (EB) in a colossal magnetoresistance Nd2/3Ca1/3MnO3 manganite at low temperatures, evident of its intrinsic interface exchange coupling. The phenomenon found confirms our previous assumption that the low temperature magnetic structure of the compound is represented by small (nano-sized) ferromagnetic clusters immersed within the charge-ordered antiferromagnetic matrix. Magnetic behavior of the Nd2/3Ca1/3MnO3 perovskite at low temperature is consistent with its cluster-glass magnetic state originating from the self-organized phase separation. Slow relaxation of zero-field-cooled magnetization has been experimentally revealed as well. It confirms the cluster glass magnetic state of the compound.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"214 1","pages":"97-98"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83472997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-09-01DOI: 10.1109/OMEE.2012.6464796
I. Skab, Y. Vasylkiv, R. Vlokh
We have shown that the conically shaped electric field created in electrooptic crystals can lead to appearance of orbital angular momentum in the outgoing light beam and generating of optical vortex. It is verified experimentally on Bi12GeO20 crystals.
{"title":"Electrooptical method for generating of optical vortices","authors":"I. Skab, Y. Vasylkiv, R. Vlokh","doi":"10.1109/OMEE.2012.6464796","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464796","url":null,"abstract":"We have shown that the conically shaped electric field created in electrooptic crystals can lead to appearance of orbital angular momentum in the outgoing light beam and generating of optical vortex. It is verified experimentally on Bi12GeO20 crystals.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"52 1","pages":"183-184"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73517316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-09-01DOI: 10.1109/OMEE.2012.6464793
R. Ince, F. M. P. Alper, M. Yukselici, A. Aşıkoğlu, C. Allahverdi
Non-linear optical properties of weakly confined CdTe nanocrystals in a glass matrix were studied by electro-modulation spectroscopy. Copper electrodes of about 10 nm thick were deposited on both sides of glass samples of thickness 0.8 mm by physical vapor deposition. Optical transmission spectra of the samples were recorded under dc high voltage applied to the electrodes. The absorption band is observed to broaden. This is most likely caused by state filling.
{"title":"CdTe nanocrystals studied through in-situ electro-modulation spectroscopy","authors":"R. Ince, F. M. P. Alper, M. Yukselici, A. Aşıkoğlu, C. Allahverdi","doi":"10.1109/OMEE.2012.6464793","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464793","url":null,"abstract":"Non-linear optical properties of weakly confined CdTe nanocrystals in a glass matrix were studied by electro-modulation spectroscopy. Copper electrodes of about 10 nm thick were deposited on both sides of glass samples of thickness 0.8 mm by physical vapor deposition. Optical transmission spectra of the samples were recorded under dc high voltage applied to the electrodes. The absorption band is observed to broaden. This is most likely caused by state filling.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"39 1","pages":"75-76"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88198706","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-09-01DOI: 10.1109/OMEE.2012.6464904
A. Luchechko, I. Syvorotka, Y. Zakharko, I. Syvorotka
Absorption, emission spectra under UV and X-ray excitations, as well as luminescence decay kinetics of GGG:Bi single crystalline films were studied. The emission spectra observed in the spectral region 350–700 nm at room temperature consist two elementary bands peaked at 446 and 521 nm. The influence of growth conditions on the optical-luminescent properties of GGG: Bi3+ garnet have been revealed. The ratio of the bands intensities in luminescence spectra under different types of excitation and their temperature dependencies were determined.
{"title":"Luminescence of Bi3+ ions in GGG epitaxial films","authors":"A. Luchechko, I. Syvorotka, Y. Zakharko, I. Syvorotka","doi":"10.1109/OMEE.2012.6464904","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464904","url":null,"abstract":"Absorption, emission spectra under UV and X-ray excitations, as well as luminescence decay kinetics of GGG:Bi single crystalline films were studied. The emission spectra observed in the spectral region 350–700 nm at room temperature consist two elementary bands peaked at 446 and 521 nm. The influence of growth conditions on the optical-luminescent properties of GGG: Bi3+ garnet have been revealed. The ratio of the bands intensities in luminescence spectra under different types of excitation and their temperature dependencies were determined.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"29 1","pages":"215-216"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85219037","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-09-01DOI: 10.1109/OMEE.2012.6464760
O. Kyrpa, O. Vasylyev, M. Brychevs'kyi, E. Pryshchepa, A. Smirnova
The dependencies of ionic oxygen conductivity of 10Sc1CeSZ electrolytes made of different zirconia powders those differ by their impurities and production technologies, and sintered in air at different temperatures after uniaxial pressing are analyzed in terms of their Arrhenius equations in 400–900°C temperature range. Deviation from a typical linear dependence of conductivity on temperature that is the most clearly visible in the electrolyte made of the purest powder is observed as a kink on the temperature dependency. A position of the kink point is determined by powder properties and is practically independent on temperature of powder sintering.
{"title":"On the dependence of ionic conductivity of ScSZ electrolytes on temperature of their sintering","authors":"O. Kyrpa, O. Vasylyev, M. Brychevs'kyi, E. Pryshchepa, A. Smirnova","doi":"10.1109/OMEE.2012.6464760","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464760","url":null,"abstract":"The dependencies of ionic oxygen conductivity of 10Sc1CeSZ electrolytes made of different zirconia powders those differ by their impurities and production technologies, and sintered in air at different temperatures after uniaxial pressing are analyzed in terms of their Arrhenius equations in 400–900°C temperature range. Deviation from a typical linear dependence of conductivity on temperature that is the most clearly visible in the electrolyte made of the purest powder is observed as a kink on the temperature dependency. A position of the kink point is determined by powder properties and is practically independent on temperature of powder sintering.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"11 1","pages":"295-296"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84275667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-09-01DOI: 10.1109/OMEE.2012.6464898
B. Padlyak, B. Pieprzyk, A. Drzewiecki, V. Adamiv, Y. Burak, I. Teslyuk
The high optical quality glasses with CaB4O7:Tb, LiCaBO3:Tb, CaB4O7:Dy, and LiCaBO3:Dy compositions containing 0.5 and 1.0 mol. % Tb2O3 and Dy2O3 have been obtained. By electron paramagnetic resonance (EPR) and optical spectroscopy it was shown that the Tb and Dy impurities are incorporated in the CaB4O7 and LiCaBO3 glass network as Tb3+ (4f8, 7F6) and Dy3+ (4f9, 6H15/2) ions, exclusively. All observed f - f transitions of Tb3+ and Dy3+ centres in optical absorption, luminescence excitation and emission spectra have been identified. Luminescence kinetic shows single exponential decay for Tb3+ and Dy3+ centres in the CaB4O7 and LiCaBO3 glasses. Lifetimes for main emitting levels of Tb3+ and Dy3+ centres in all investigated glasses were determined at T = 300 K. Spectroscopy shows that obtained glasses are promising luminescent materials.
{"title":"Synthesis and optical spectroscopy of borate glasses, doped with terbium and dysprosium","authors":"B. Padlyak, B. Pieprzyk, A. Drzewiecki, V. Adamiv, Y. Burak, I. Teslyuk","doi":"10.1109/OMEE.2012.6464898","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464898","url":null,"abstract":"The high optical quality glasses with CaB4O<inf>7</inf>:Tb, LiCaBO<inf>3</inf>:Tb, CaB<inf>4</inf>O<inf>7</inf>:Dy, and LiCaBO<inf>3</inf>:Dy compositions containing 0.5 and 1.0 mol. % Tb<inf>2</inf>O<inf>3</inf> and Dy<inf>2</inf>O<inf>3</inf> have been obtained. By electron paramagnetic resonance (EPR) and optical spectroscopy it was shown that the Tb and Dy impurities are incorporated in the CaB<inf>4</inf>O<inf>7</inf> and LiCaBO<inf>3</inf> glass network as Tb<sup>3+</sup> (4f<sup>8</sup>, <sup>7</sup>F<inf>6</inf>) and Dy<sup>3+</sup> (4f<sup>9</sup>, <sup>6</sup>H<inf>15/2</inf>) ions, exclusively. All observed f - f transitions of Tb<sup>3+</sup> and Dy<sup>3+</sup> centres in optical absorption, luminescence excitation and emission spectra have been identified. Luminescence kinetic shows single exponential decay for Tb<sup>3+</sup> and Dy<sup>3+</sup> centres in the CaB<inf>4</inf>O<inf>7</inf> and LiCaBO<inf>3</inf> glasses. Lifetimes for main emitting levels of Tb<sup>3+</sup> and Dy<sup>3+</sup> centres in all investigated glasses were determined at T = 300 K. Spectroscopy shows that obtained glasses are promising luminescent materials.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"47 1","pages":"207-208"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86696469","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2012-09-01DOI: 10.1109/OMEE.2012.6464862
A. Doroshenko, D. Kosyanov, P. Mateychenko, N. Matveevskaya, S. Parkhomenko, V. Puzikov, A. Tolmachev, R. Yavetskiy, Y. Kopylov, V. B. Kravchenko
Nd:YAG ceramics were fabricated by solid-state reactive sintering of commercial powders and vacuum sintering of custom made co-precipitated nanopowders. The densities, microstructure, average grain size, residual porosity, optical transmittances of the sintered ceramics were compared. Nd:YAG ceramics produced by solid-state reactive sintering possess higher transmittance compared to vacuum-sintered ceramics from co-precipitated nanopowders, which is however still lower than that of single crystals. The possible ways to improve optical quality of Nd:YAG ceramics are discussed.
{"title":"Comparison of Nd:YAG optical ceramics produced by different sintering routes","authors":"A. Doroshenko, D. Kosyanov, P. Mateychenko, N. Matveevskaya, S. Parkhomenko, V. Puzikov, A. Tolmachev, R. Yavetskiy, Y. Kopylov, V. B. Kravchenko","doi":"10.1109/OMEE.2012.6464862","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464862","url":null,"abstract":"Nd:YAG ceramics were fabricated by solid-state reactive sintering of commercial powders and vacuum sintering of custom made co-precipitated nanopowders. The densities, microstructure, average grain size, residual porosity, optical transmittances of the sintered ceramics were compared. Nd:YAG ceramics produced by solid-state reactive sintering possess higher transmittance compared to vacuum-sintered ceramics from co-precipitated nanopowders, which is however still lower than that of single crystals. The possible ways to improve optical quality of Nd:YAG ceramics are discussed.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"125 1","pages":"21-22"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89437230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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