V. B. Vykhodets, T. E. Kurennykh
SOLUBILITY OF DEUTERIUM IN ALUMINA NANOPOWDERS
DOI: 10.17804/2410-9908.2016.5.006-014 The paper presents data on the effect of surface oxygen deficiency in nanoparticles on the catalytic properties of oxide nanopowders. Data on the interaction of nanopowders with gaseous hydrogen are the test modeling catalytic properties. Alumina nanopowders synthesized using laser evaporation of a ceramic target dissolve deuterium during their annealing in gaseous deuterium. It is only the surface atomic layer of nanoparticles with very large oxygen deficiency that has the ability to dissolve deuterium. Oxygen deficiency and deuterium solubility are adjustable properties of nanoparticles. They can be changed by annealing nanopowders in oxygen. Stoichiometric alumina virtually does not dissolve deuterium. A technological scheme is proposed for synthesizing oxide nanopowders with controllable surface oxygen deficiency, physical-chemical and functional properties.
Keywords: deuterium, alumina nanopowder, catalytic properties, oxygen nonstoichiometry, nuclear reaction analysis References: 1. Vykhodets V.B., Jarvis E., Kurennykh T.E., Davletshin A.E., Obukhov S.I., Beketov I.V., Samatov O.M., Medvedev A.I. Extreme deviations from stoichiometry in alumina nanopowders. Surface Science, 2014, vol. 630, pp. 182–186. DOI: 10.1016/j.susc.2014.08.009.
2. Vykhodets V.B., Jarvis E., Kurennykh T.E., Beketov I.V., Obukhov S.I., Samatov O.M., Medvedev A.I., Davletshin A.E., Whyte T. Inhomogeneous depletion of oxygen ions in oxide nanoparticles. Surface Science, 2016, vol. 644, pp. 41–147. DOI: 10.1016/j.susc.2015.10.011.
3. Jarvis E.A.A., Carter E.A. Metallic Character of the Al2O3(0001)-( x)R ± 9° Surface Reconstruction. J. Phys. Chem B, 2001, vol. 105, iss. 18, pp. 4045-4052. DOI: 10.1021/jp003587c.
4. French T.M., Somorjai Gabor A. Composition and surface structure of the (0001) face of a-alumina by low-energy electron diffraction. J. Phys. Chem., 1970, vol. 74, no. 12, pp. 2489–2495.
5. Sundaresan A., Bhargavi R., Rangarajan N., Siddesh U., Rao C. N. R. Ferromagnetism as a universal feature of nanoparticles of the otherwise nonmagnetic oxides. Phys. Rev. B, 2006, vol. 74, iss. 16, pp. 161306(R). DOI: 10.1103/PhysRevB.74.161306.
6. Sudakar C., Kharel P., Suryanarayanan R., Thakurc J.S., Naikd V.M., Naika R., Lawes G. Room temperature ferromagnetism in vacuum-annealed TiO2 thin films. JMMM, 2008, vol. 320, iss. 5, pp. L31–L36. DOI: 10.1016/j.jmmm.2007.07.026.
7. Hong N., Sakai J., Poirot N., Brisé V. Room-temperature ferromagnetism observed in undoped semiconducting and insulating oxide thin films. Phys. Rev. B, 2006, vol. 73, iss. 13, pp. 132404. DOI: 10.1103/PhysRevB.73.132404.
8. Coey J.M.D. High-temperature ferromagnetism in dilute magnetic oxides. J. Appl. Phys., 2005, vol. 97, iss. 10, part 2, pp. 10D313. DOI: 10.1063/1.1849054.
9. Venkatesan M., Fitzgerald C.B., Coey J.M.D. Unexpected magnetism in a dielectric oxide. Nature, 2004, vol. 430, iss. 7000, pp. 630. DOI: 10.1038/430630a.
10. Dutta P., Seehra M.S., Zhang Y., Wender I. Nature of magnetism in copper-doped oxides: ZrO2, TiO2, MgO, SiO2, Al2O3, and ZnO. J. Appl. Phys., 2008, vol. 103, iss. 7, pp. 07D104. DOI: 10.1063/1.2830555/.
11. Coey J.M.D., Venkatesan M., Stamenov P., Fitzgerald C.B., Dorneles L.S. Magnetism in hafnium dioxide. Phys. Rev. B, 2005, vol. 72, iss. 2, pp. 024450. DOI: 10.1103/PhysRevB.72.024450.
12. Vykhodets V.B., Klotsman S.M, Levin A.D. Oxygen diffusion in alpha Titanium. 2. Calculation of concentrational profile of impurity by nuclear microanalysis. Fizika Metallov i Metallovedenie, 1987, vol.64, iss. 5, pp. 920–923.
Article reference
Vykhodets V. B., Kurennykh T. E. Solubility of Deuterium in Alumina Nanopowders // Diagnostics, Resource and Mechanics of materials and structures. -
2016. - Iss. 5. - P. 6-14. - DOI: 10.17804/2410-9908.2016.5.006-014. -
URL: http://eng.dream-journal.org/issues/2016-5/2016-5_97.html (accessed: 12/02/2024).
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