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Pis'ma v Zhurnal Èksperimental'noi i Teoreticheskoi Fiziki, 2008, Volume 87, Issue 2, Pages 124–128
(Mi jetpl25)
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This article is cited in 13 scientific papers (total in 13 papers)
CONDENSED MATTER
Grain boundary self-diffusion of tracer 18O atoms in nanocrystalline oxide LaMnO3 + δ
V. B. Vykhodetsa, E. V. Vykhodetsb, B. A. Gizhevskiia, R. G. Zakharovc, E. A. Kozlovd, T. E. Kurennykha, S. A. Petrovac, I. Sh. Trakhtenberga, A. Ya. Fishmanc a Institute of Metal Physics, Ural Division, Russian Academy of Sciences, ul. S. Kovalevskoi 18, Yekaterinburg, 620041, Russia
b Ural State Technical University, ul. Mira 19, Yekaterinburg, 620002, Russia
c Institute of Metallurgy, Ural Division, Russian Academy of Sciences, ul. Amundsena 101, Yekaterinburg, 620016, Russia
d Russian Federal Nuclear Center VNIITF, Snezhinsk, Chelyabinsk region, 456770, Russia
Abstract:
Diffusion coefficients of tracer 18O atoms at boundaries of nanograins of LaMnO3 + δ oxide have been measured in the temperature range of 400–500°C. The samples of the nanocrystalline oxide are prepared with the use of the shockwave loading method. The concentration profile of the tracer atoms after diffusion annealing is measured with the use of the nuclear microanalysis method. The activation energies of the grain boundary diffusion amounts to about 2 eV and the boundary width is ~0.05 nm. The measured coefficients of the grain boundary diffusion at 500°C exceed the corresponding coefficients of the volume diffusion by seven orders of magnitude.
Received: 29.11.2007 Revised: 13.12.2007
Citation:
V. B. Vykhodets, E. V. Vykhodets, B. A. Gizhevskii, R. G. Zakharov, E. A. Kozlov, T. E. Kurennykh, S. A. Petrova, I. Sh. Trakhtenberg, A. Ya. Fishman, “Grain boundary self-diffusion of tracer 18O atoms in nanocrystalline oxide LaMnO3 + δ”, Pis'ma v Zh. Èksper. Teoret. Fiz., 87:2 (2008), 124–128; JETP Letters, 87:2 (2008), 115–119
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