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AbstractAbstract
[en] Action of carbone dioxide on an aqueous suspension of vanadium pentoxyde gives an acid and yellow solution. The study of the composition of the product obtained by evaporation and of the physicochemical properties by methods as thermogravimetry and determination of electronic and IR spectra, allows to assert the existence of a carboxyvanadic derivative
[fr]
L'action du dioxyde de carbone sur une suspension aqueuse de vanadium conduit a une solution jaune a caractere acide. L'etude de la composition du produit obtenu par evaporation, des proprietes physicochimiques notamment des spectres electroniques et infrarouges, et du comportement thermogravimetrique, permettent d'affirmer l'existence d'un compose carboxyvanadiqueOriginal Title
Action du dioxyde de carbone sur le pentoxyde de vanadium: etude d'un derive carboxyvanadique
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AbstractAbstract
[en] The equilibrium oxygen partial pressure over nonstoichiometric V2O5-x and the related two-phase mixture has been measured by coulometric titration using yttria-stabilized zirconia (YSZ) as the solid electrolyte at temperatures between 880 and 936 K. The nonstoichiometry (x) is observed up to 0.055 at 920 K and is related to the oxygen partial pressure (PO2) as x∝PO2-1/4 in the region of x<0.017. This fact suggests the formation of the defect associate between an oxygen vacancy and a tetravalent vanadium ion. The equilibrium oxygen partial pressure over the coexisting mixture of V2O5 and V4O9 and the standard free energy change of the reaction, 4V2O5→2V4O9+O2 at temperatures between 880 and 936 K are determined. 24 refs.; 8 figs.; 1 table
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AbstractAbstract
[en] Energy of preference of Ti2+, Ti3+, V2+, V3+, V4+, Cr3+, Cr4+, Cr6+ ions to octahedral positions is calculated using the equation connecting heats of oxide atomization and characteristic distances of metal-oxygen
Original Title
Ehnergii predpochteniya ionov Ti2+, Ti3+. V2+, V3+, V4+, Cr3+, Cr6+ k oktaehdricheskim pozitsiyam v kislorodnom okruzhenii
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Source
For English translation see the journal Moscow University Chemistry Bulletin (USA).
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Journal Article
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Vestnik Moskovskogo Universiteta, Seriya 2. Khimiya; ISSN 0579-9384;
; v. 23(1); p. 60-61

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Manukhin, A.V.; Kryukova, L.M.; Nekuryashchikh, E.V.
Riecansky (V.E.) Technical Translations, Balsham, Cambridge (United Kingdom)1991
Riecansky (V.E.) Technical Translations, Balsham, Cambridge (United Kingdom)1991
AbstractAbstract
[en] Electron-microscopic study showed that V205 irradiation by 120 keV electron beam in rather thick crystals provided possibility of procedure of two simultaneous processes: V205->V02 phase transformation - at the boundary with carbon; V205->V409->V02 - the absence of carbon. It is shown that these phase transformations are not the result of thermal effect. (author)
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1991; 3 p; Available from The British Library Document Supply Centre, Boston Spa, Wetherby, West Yorks. LS23 7BQ; Translated from Fizika i Khimiya Obrabotki Materialov (Jul-Aug 1989) v. 23(4) p. 20-23.
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Report
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Translation
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Tsybulev, P.N.; Pinchuk, A.M.; Parkhomenko, N.V.; AN Ukrainskoj SSR, Kiev
Conference on quantum chemistry of solids1990
Conference on quantum chemistry of solids1990
AbstractAbstract
[en] Short note
Original Title
Khemosorbtsiya molekuly vodoroda na oksidakh perekhodnykh metallov
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Latvijskij Gosudarstvennyj Univ., Riga (Latvia). Nauchno-Issledovatel'skij Inst. Fiziki Tverdogo Tela; 101 p; 1990; p. 273; Conference on quantum chemistry of solids; Riga (USSR); 26-30 Nov 1990
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Miscellaneous
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Alexander, D.G.
Ames Lab., Iowa (USA)1971
Ames Lab., Iowa (USA)1971
AbstractAbstract
No abstract available
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Jun 1971; 58 p; Thesis.
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AbstractAbstract
[en] The diffusion coefficient of Li+ in the γ-lithium vanadium bronze (Li1+xV3O8) has been measured with the long-pulse galvanostatic technique. Values ranging from 1.7 X 10-7 cm2s-1, at x=0.3, to 2.2 X 10-8 cm2s-1, at x=1.4, have been measured. The thermodynamic factors, d ln a/d ln c, determined from the OCV/x curve and from voltage relaxation after the current pulse, have a mean value of ∼ 15. The pseudo two-phase region observed in the OCV/x curve at high Li+ concentrations seems attributable to ordering of Li+ in specific sites and to alteration of the unit cell. This process is reversible as shown by X-ray diffractometry. Finally, from OCV/t plots at different x, the partial molar entropy of Li+ was determined. The values, on account of the large dE(x)/dt measured, are higher than those found for V6O13 or TiS2. 19 refs.; 7 figs
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Journal Article
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Solid State Ionics; CODEN SSIOD; v. 24(2); p. 103-109
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AbstractAbstract
No abstract available
Original Title
Positronenvernichtung in VO2 und V2O3
Source
Netzband, D. (ed.); Bergakademie Freiberg (German Democratic Republic). Sektion Physik; Friedrich-Schiller-Universitaet, Jena (German Democratic Republic). Sektion Physik; Karl-Marx-Universitaet, Leipzig (German Democratic Republic). Sektion Physik; Technische Univ., Dresden (German Democratic Republic). Sektion Physik; Zentralinstitut fuer Kernforschung, Rossendorf bei Dresden (German Democratic Republic); p. 93-94; Aug 1975; Published in summary form only.
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Liang, Jiran; Song, Xiaolong; Li, Peng; Zhou, Liwei; Guo, Jinbang, E-mail: liang_jiran@tju.edu.cn2019
AbstractAbstract
[en] A vanadium dioxide (VO2) and Gold nanotriangle composite sandwich structure (VO2/Au/VO2) was fabricated via nanosphere lithography technique. It exhibits reversible localized surface plasmon resonance tunability through external thermal stimuli VO2 phase transition by tuning the near-field permittivity of Au nanotriangle. Compared optical response to the Au/VO2 (bottom Au top VO2) and VO2/Au (bottomVO2 top Au) composite nanotriangle arrays, VO2/Au/VO2 structure shows a largest wavelength shift of 42 nm and a largest transmittance modulation of 13.2% between the hot-metallic and cold-insulating states. And the wavelength shift of Au/VO2 nanotriangle array is larger than that of VO2/Au array for the higher electric intensity on top surface of Au nanotriangle. The results suggest that this sandwich architecture is one path for designing a plasmonic structure with tunable resonance responses that can be tailored by varying the top and bottom phase materials properties of the hybrid structures. (paper)
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Available from http://dx.doi.org/10.1088/2053-1591/ab27a0; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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Materials Research Express (Online); ISSN 2053-1591;
; v. 6(8); [10 p.]

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AbstractAbstract
[en] An ab-initio cluster calculation of the electronic d-states in VO2 has been made by using the self-consistent statistical exchange multiple scattering method. VO68- octaedron was used to represent the tetragonal phase, and a V2O1012- cluster with paired vanadium atoms was used for the monoclinic phase. Our results are in conflict with an explanation of the semiconducting gap in terms of simple distortion-induced band splitting
[fr]
Un calcul des etats electroniques d de VO2 a partir des premiers principes a ete effectue. On utilise, de maniere auto-coherente, la methode par diffusion multiple, avec traitement statistique de l'echange. Un octaedre de VO68- a ete utilise pour representer la phase tetragonale et un amas V2O1012- avec des atomes de vanadium apparies a ete utilise pour la phase monoclinique. Les resultats obtenus sont en contradiction avec une explication de l'origine de la bande interdite du semiconducteur en terme de separation de bandes induite par la distorsionRecord Type
Journal Article
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J. Phys. (Paris), Lett; v. 36(5); p. L.157-L.160
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