Isotope Exchange between 18O2 Gas and Mechanoactivated Oxides of the Family Rare Earth – Manganese – Oxygen

Anatoly Yakovlevich Fishman; G.A. Kozhina; Tatiana Eugenievna Kurennykh; E.V. Vykhodets; Vladimir Borisovich Vykhodets

doi:10.4028/www.scientific.net/DDF.354.153

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Isotope Exchange between ¹⁸O₂ Gas and Mechanoactivated Oxides of the Family Rare Earth – Manganese – Oxygen

Abstract:

The results of measurements of the bulk diffusion of tracer oxygen atoms in the oxides LnMnO₃₊_δ (Ln = La, Nd, Sm) in the temperature range 400 – 750°С are presented. The measurements were carried out on micro-and nanopowders. Nanoscale powders were prepared by mechanical activation. A method based on the study of the kinetics of oxygen isotope exchange between the powder and gaseous oxygen enriched with ¹⁸O isotope was used to obtain data on the diffusion coefficients. The average concentration of ¹⁸O isotope in the powders was measured using NRA technique. The obtained diffusion coefficients lay in the range of 10^-21- 10^-24m²/s, the diffusion activation energy for all the oxides have been close to 1 eV. These results suggest that the migration of tracer oxygen in oxides LаMnO₃₊_δ, NdMnO₃₊_δ and SmMnO₃₊_δ at low temperatures is realized via structural defects. As for the oxide LaMnO₃₊_δ, its oxygen diffusion coefficients at low temperatures have been lower than the values extrapolated from high temperatures. Such behavior of diffusion properties has not been previously observed in other metal oxides. In this regard, the vacancy formation energy in the rare earth manganites has been supposed to increase with decreasing temperature.

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Defect and Diffusion Forum (Volume 354)

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153-158

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.354.153

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Online since:

June 2014

Authors:

Anatoly Yakovlevich Fishman*, G.A. Kozhina, Tatiana Eugenievna Kurennykh, E.V. Vykhodets, Vladimir Borisovich Vykhodets

Keywords:

Diffusion, Manganites, Mechanoactivation, Nuclear Microanalysis, Oxides, Oxygen Isotope Exchange

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