The kinetics of the isotope exchange between gaseous oxygen enriched with the 18O
isotope and two LaMnO3+δ oxide samples – a nanopowder and a bulk nanocrystal – has been
studied. The 18O isotope concentration has been measured by the acceleration nuclear microanalysis
method. The coefficients of the volume and the nanograin boundary self-diffusion of oxygen have
been evaluated at 500 °C. They are equal to 3.5·10
−20 and 1.5·10
−13 cm2/s, respectively.
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