Pub Date : 2012-09-01DOI: 10.1109/OMEE.2012.6464783
A. A. Babaryk, I. V. Odynets, V. Baumer, N. Slobodyanik, S. Khainakov, S. Hoffmann
Single crystals of K2Ta4O11 (I), K(TaO2)2PO4 (II) and K3Ta5O11(PO4)2 (III) were synthesized by flux-aided method in the pseudo-quaternary system K2O-P2O5-Ta2O5-MoO3. Tight interrelation of their crystal structures has been found via X-ray diffraction study. Experimental solid-state band gap measurements revealed its semiconductor nature corroborated with DFT calculations. Local structure of PO4 groups in (II) and (III) compounds was probed with 31P MAS NMR spectroscopy.
在K2O-P2O5-Ta2O5-MoO3准四元体系中，采用助熔剂法合成了K2Ta4O11 (I)、K(TaO2)2PO4 (II)和K3Ta5O11(PO4)2 (III)单晶。通过x射线衍射研究发现它们的晶体结构具有紧密的相互关系。实验固态带隙测量显示其半导体性质与DFT计算相证实。(II)和(III)化合物中PO4基团的局部结构用31P MAS NMR进行了探测。
{"title":"Synthesis and structural relationship of complex tantalum phosphates in the flux system K2O-P2O5-Ta2O5-MoO3","authors":"A. A. Babaryk, I. V. Odynets, V. Baumer, N. Slobodyanik, S. Khainakov, S. Hoffmann","doi":"10.1109/OMEE.2012.6464783","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464783","url":null,"abstract":"Single crystals of K<inf>2</inf>Ta<inf>4</inf>O<inf>11</inf> (I), K(TaO<inf>2</inf>)<inf>2</inf>PO<inf>4</inf> (II) and K<inf>3</inf>Ta<inf>5</inf>O<inf>11</inf>(PO<inf>4</inf>)<inf>2</inf> (III) were synthesized by flux-aided method in the pseudo-quaternary system K<inf>2</inf>O-P<inf>2</inf>O<inf>5</inf>-Ta<inf>2</inf>O<inf>5</inf>-MoO<inf>3</inf>. Tight interrelation of their crystal structures has been found via X-ray diffraction study. Experimental solid-state band gap measurements revealed its semiconductor nature corroborated with DFT calculations. Local structure of PO<inf>4</inf> groups in (II) and (III) compounds was probed with <sup>31</sup>P MAS NMR spectroscopy.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"59 1","pages":"99-100"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80251754","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.2012.6464782
S. Tekeli, B. Aktas, S. Salman
In this study, 8 mol % yttria stabilized cubic zirconia (8YSZ) powders as a matrix material and 0-15 wt% La2O3 powders as an additive were used in order to determine the effect of La2O3 addition and amount on the phase stability, microstructure and mechanical properties of 8YSZ. XRD results showed the existence of cubic and hexagonal crystal structures for all addition amounts. Besides, La2O3 up to 5 wt% was completely dissolved in the crystal structure of 8YSZ but, La2O3 with higher than 5 wt% reacted with 8YSZ at high temperatures and formed pyrochloric La2Zr2O7 compound. The hardness values of 8YSZ decreased and fracture toughness increased with the increase in La2O3 amount.
{"title":"Synthesis and mechanical properties of lanthanum oxide (La2O3)doped 8 mol % yttria-stabilized cubic zirconia (8YSZ)","authors":"S. Tekeli, B. Aktas, S. Salman","doi":"10.1109/OMEE.2012.6464782","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464782","url":null,"abstract":"In this study, 8 mol % yttria stabilized cubic zirconia (8YSZ) powders as a matrix material and 0-15 wt% La<inf>2</inf>O<inf>3</inf> powders as an additive were used in order to determine the effect of La<inf>2</inf>O<inf>3</inf> addition and amount on the phase stability, microstructure and mechanical properties of 8YSZ. XRD results showed the existence of cubic and hexagonal crystal structures for all addition amounts. Besides, La<inf>2</inf>O<inf>3</inf> up to 5 wt% was completely dissolved in the crystal structure of 8YSZ but, La<inf>2</inf>O<inf>3</inf> with higher than 5 wt% reacted with 8YSZ at high temperatures and formed pyrochloric La<inf>2</inf>Zr<inf>2</inf>O<inf>7</inf> compound. The hardness values of 8YSZ decreased and fracture toughness increased with the increase in La<inf>2</inf>O<inf>3</inf> amount.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"37 2 1","pages":"101-102"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80185187","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.2012.6464762
F. Glazunov, I. Danilenko, T. Konstantinova, V. Glazunova, G. Volkova, V.V. Burhovetsky
SOFC composite materials were prepared from nanopowder mixtures of yttria stabilized zirconia - nickel oxide as anode and yttria stabilized zirconia - lanthanum manganite as cathode. The influence of particle size, pore former and sintering temperature on structure and properties of the electrode materials were investigated. The optimal conditions of full reduction of nickel oxide in anode materials were found. Anode material of 55 MPa strength and 38 % porosity was obtained. A SOFC single cell of obtained composite nanopowders was made and tested.
{"title":"Structure and properties of SOFC electrode materials made from nanopowders","authors":"F. Glazunov, I. Danilenko, T. Konstantinova, V. Glazunova, G. Volkova, V.V. Burhovetsky","doi":"10.1109/OMEE.2012.6464762","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464762","url":null,"abstract":"SOFC composite materials were prepared from nanopowder mixtures of yttria stabilized zirconia - nickel oxide as anode and yttria stabilized zirconia - lanthanum manganite as cathode. The influence of particle size, pore former and sintering temperature on structure and properties of the electrode materials were investigated. The optimal conditions of full reduction of nickel oxide in anode materials were found. Anode material of 55 MPa strength and 38 % porosity was obtained. A SOFC single cell of obtained composite nanopowders was made and tested.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"4 1","pages":"291-292"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87776174","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.2012.6464765
S. Kobylianska, O. V’yunov, O. Gavrilenko, A. Belous
We have synthesized Li0.5−yNayLa0.5 Nb2O6 and Li0.5−yNayLa0.5 Ta2O6 defect perovskite solid solutions with 0 < y ≤ 0.5. Lithium ion diffusion in the investigated system exhibits no percolation effect. In the Li0.5−yNayLa0.5 Nb2O6 system, the ionic conductivity as a function of sodium content has a maximum due to two competing factors: the increase in perovskite cell volume and the decrease in lithium ion concentration. The ionic conductivity of Li0.5−yNayLa0.5 Ta2O6 samples decreases with sodium content.
{"title":"The structure and ionic conductivity of Li0.5−yNayLa0.5 {Nb,Ta}2O6 system","authors":"S. Kobylianska, O. V’yunov, O. Gavrilenko, A. Belous","doi":"10.1109/OMEE.2012.6464765","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464765","url":null,"abstract":"We have synthesized Li<inf>0.5−y</inf>Na<inf>y</inf>La<inf>0.5</inf> Nb<inf>2</inf>O<inf>6</inf> and Li<inf>0.5−y</inf>Na<inf>y</inf>La<inf>0.5</inf> Ta<inf>2</inf>O<inf>6</inf> defect perovskite solid solutions with 0 < y ≤ 0.5. Lithium ion diffusion in the investigated system exhibits no percolation effect. In the Li<inf>0.5−y</inf>Na<inf>y</inf>La<inf>0.5</inf> Nb<inf>2</inf>O<inf>6</inf> system, the ionic conductivity as a function of sodium content has a maximum due to two competing factors: the increase in perovskite cell volume and the decrease in lithium ion concentration. The ionic conductivity of Li<inf>0.5−y</inf>Na<inf>y</inf>La<inf>0.5</inf> Ta<inf>2</inf>O<inf>6</inf> samples decreases with sodium content.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"314 1","pages":"285-286"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85301466","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.2012.6464795
O. Yelenich, S. Solopan, A. Tovstolytkin
In this research crystalline ultrafine nanoparticles of AFe2O4 (A = Mn, Fe, Co, Ni, Zn) compounds with spinel structure have been synthesized by the coprecipitation from nonaqueous solutions method. As the nonaqueous medium was used diethylene glycol. The AFe2O4 nanoparticles were characterized using X-Ray diffraction analysis, thermogravimetric analysis, differential thermal analysis, infrared spectroscopy, vibrating sample magnetometry.
本文采用非水溶液共沉淀法合成了具有尖晶石结构的AFe2O4 (A = Mn, Fe, Co, Ni, Zn)晶体超细纳米颗粒。采用二甘醇作为非水介质。采用x射线衍射分析、热重分析、差热分析、红外光谱分析、振动样品磁强分析等方法对纳米AFe2O4进行了表征。
{"title":"Synthesis and Properties of AFe2O4 (A = Mn, Fe, Co, Ni, Zn)-based nanoparticles coprecipitated from nonaqueous solutions","authors":"O. Yelenich, S. Solopan, A. Tovstolytkin","doi":"10.1109/OMEE.2012.6464795","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464795","url":null,"abstract":"In this research crystalline ultrafine nanoparticles of AFe2O4 (A = Mn, Fe, Co, Ni, Zn) compounds with spinel structure have been synthesized by the coprecipitation from nonaqueous solutions method. As the nonaqueous medium was used diethylene glycol. The AFe2O4 nanoparticles were characterized using X-Ray diffraction analysis, thermogravimetric analysis, differential thermal analysis, infrared spectroscopy, vibrating sample magnetometry.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"56 1","pages":"71-72"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85407293","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.2012.6464766
E. Naumovich, M. V. Patrakeev, A. Shaula, V. Kharton
The present work is focused on the analysis of oxygen migration processes in layered oxide materials, employing molecular dynamics (MD) simulations validated by various experimental results. In addition to standard MD approaches, a new technique was developed to explore anisotropic diffusion by analyzing transfer between special sites - ion trajectory nodes determined without using crystallographic information on the ideal anion positions. Applicability of this approach was demonstrated by the simulations of anisotropic oxygen transport in La2NiO4+δ.
{"title":"Ionic transport in anisotropic oxide lattices: In-depth analysis of molecular dynamics data and selected experimental results","authors":"E. Naumovich, M. V. Patrakeev, A. Shaula, V. Kharton","doi":"10.1109/OMEE.2012.6464766","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464766","url":null,"abstract":"The present work is focused on the analysis of oxygen migration processes in layered oxide materials, employing molecular dynamics (MD) simulations validated by various experimental results. In addition to standard MD approaches, a new technique was developed to explore anisotropic diffusion by analyzing transfer between special sites - ion trajectory nodes determined without using crystallographic information on the ideal anion positions. Applicability of this approach was demonstrated by the simulations of anisotropic oxygen transport in La2NiO4+δ.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"18 1","pages":"283-284"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81808516","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.2012.6464789
Y. Shpotyuk, I. Polovynko
Optical changes caused by 60Co γ-irradiation are studied in glassy-like As2S3. The observed long-wave shift in the range of fundamental optical absorption edge accompanied by increase in transmittance is explained as a manifestation of complicated nature of radiation-induced structural transformations associated with coordination topological defects and additional shrinkage input from natural physical ageing.
{"title":"Optical-spectroscopic signature of radiation-induced instability in glassy arsenic sulphides","authors":"Y. Shpotyuk, I. Polovynko","doi":"10.1109/OMEE.2012.6464789","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464789","url":null,"abstract":"Optical changes caused by 60Co γ-irradiation are studied in glassy-like As2S3. The observed long-wave shift in the range of fundamental optical absorption edge accompanied by increase in transmittance is explained as a manifestation of complicated nature of radiation-induced structural transformations associated with coordination topological defects and additional shrinkage input from natural physical ageing.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"109 1","pages":"83-84"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79599139","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.2012.6464853
K. Gas, E. Lusakowska, P. Baroni, S. Petit, W. Szuszkiewicz
In order to investigate the temperature dependence of the ZnO phonon dispersion the inelastic neutron scattering measurements were performed on large, single crystal of this compound. The acoustic branches were determined at several temperatures between liquid helium temperature and room temperature along selected high-symmetry directions in the Brillouin zone.
{"title":"Modification of the ZnO acoustic phonon dispersion with temperature: Inelastic neutron scattering data","authors":"K. Gas, E. Lusakowska, P. Baroni, S. Petit, W. Szuszkiewicz","doi":"10.1109/OMEE.2012.6464853","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464853","url":null,"abstract":"In order to investigate the temperature dependence of the ZnO phonon dispersion the inelastic neutron scattering measurements were performed on large, single crystal of this compound. The acoustic branches were determined at several temperatures between liquid helium temperature and room temperature along selected high-symmetry directions in the Brillouin zone.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"43 1","pages":"39-40"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80759183","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.2012.6464863
M. Kosmyna, P. Mateychenko, B. P. Nazarenko, V. Puzikov, A. N. Shekhovtsov, W. Paszkowicz, O. Ermakova, P. Romanowski, A. Yasukevich, N. Kuleshov, V. Kisel, A. Gulevich, M. Demesh
Pure and Yb-doped Ca9Y(VO4)7 (CYVO) single crystals were grown using the Czochralski method. Their crystal structure was determined using powder diffraction and the defect structure was characterized using high-resolution diffraction. The undoped crystal is found to be composed of a transparent and an opaque parts. In the latter, yttrium-rich inclusions were detected. Spectral-kinetic characteristics of Yb3 -doped crystals is reported.
{"title":"Growth and characterization of pure and Yb-doped Ca9Y(VO4)7 single crystals","authors":"M. Kosmyna, P. Mateychenko, B. P. Nazarenko, V. Puzikov, A. N. Shekhovtsov, W. Paszkowicz, O. Ermakova, P. Romanowski, A. Yasukevich, N. Kuleshov, V. Kisel, A. Gulevich, M. Demesh","doi":"10.1109/OMEE.2012.6464863","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464863","url":null,"abstract":"Pure and Yb-doped Ca9Y(VO4)7 (CYVO) single crystals were grown using the Czochralski method. Their crystal structure was determined using powder diffraction and the defect structure was characterized using high-resolution diffraction. The undoped crystal is found to be composed of a transparent and an opaque parts. In the latter, yttrium-rich inclusions were detected. Spectral-kinetic characteristics of Yb3 -doped crystals is reported.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"11 1","pages":"19-20"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75644550","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.2012.6464745
N. Krutyak, V. Mikhailin, D. Spassky, I. Tupitsyna, A. Dubovik
Luminescent properties of magnesium tungstate were investigated. Two samples of MgWO4 single crystals grown by different methods were studied. Only intrinsic luminescence attributed to exciton emission was detected for the both samples and. It was shown that the temperature dependence of the low-energy edge in the excitation spectra obeys Urbach rule. Steepness coefficient that was deduced from this dependence indicates self-trapping of excitons in MgWO4. The absence of cation d states in the valence band is a distinctive feature of MgWO4 that is shown to be manifested in the luminescence excitation spectra.
{"title":"Luminescent properties of MgWO4 crystals","authors":"N. Krutyak, V. Mikhailin, D. Spassky, I. Tupitsyna, A. Dubovik","doi":"10.1109/OMEE.2012.6464745","DOIUrl":"https://doi.org/10.1109/OMEE.2012.6464745","url":null,"abstract":"Luminescent properties of magnesium tungstate were investigated. Two samples of MgWO4 single crystals grown by different methods were studied. Only intrinsic luminescence attributed to exciton emission was detected for the both samples and. It was shown that the temperature dependence of the low-energy edge in the excitation spectra obeys Urbach rule. Steepness coefficient that was deduced from this dependence indicates self-trapping of excitons in MgWO4. The absence of cation d states in the valence band is a distinctive feature of MgWO4 that is shown to be manifested in the luminescence excitation spectra.","PeriodicalId":6332,"journal":{"name":"2012 IEEE International Conference on Oxide Materials for Electronic Engineering (OMEE)","volume":"60 1","pages":"235-236"},"PeriodicalIF":0.0,"publicationDate":"2012-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83301458","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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