Isotope Exchange of Gaseous Oxygen with Oxide LaMno3+δ Nanograins Boundary

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Isotope exchange of oxygen 18О2 with the boundary of nanograins of oxide LaMnO3+ obtained by the method of shock-wave loading was investigated in the temperature range of 400 – 500 °C. It was established that the temperature dependence of the isotope exchange rate is described by the Arrhenius expression, the activation energy and the pre-exponential factor being 1.67 eV and 1.8∙102 cm/s, respectively. Comparison with literature data has shown that for oxide LaMnO3+, a significant difference in activation energies and pre-exponential factors is observed for the isotope exchange rate with a ‘defect-free’ surface and the nanograin boundary. In case of the boundary, these parameters were higher: the activation energy about two times, and the pre-exponential factor, by almost 7 orders of magnitude.

Info:

Periodical:

Defect and Diffusion Forum (Volumes 297-301)

Edited by:

Andreas Öchsner, Graeme E. Murch, Ali Shokuhfar and João M.P.Q. Delgado

Pages:

1301-1305

DOI:

10.4028/www.scientific.net/DDF.297-301.1301

Citation:

A. Y. Fishman et al., "Isotope Exchange of Gaseous Oxygen with Oxide LaMno3+δ Nanograins Boundary ", Defect and Diffusion Forum, Vols. 297-301, pp. 1301-1305, 2010

Online since:

April 2010

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$35.00

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