The self-diffusion of lithium in congruent LiNbO3 single crystals was investigated at low temperatures between 379 and 523 K by neutron reflectometry. From measurements on 6LiNbO3 (amorphous film)/natLiNbO3 (single crystal) samples, Li self-diffusivities were determined in single crystals down to extremely low values of 1 × 10-25 m2 s-1 on small length scales of 1-10 nm. The measured diffusivities are in excellent agreement with (extrapolated) literature data obtained by experiments based on Secondary Ion Mass Spectrometry and Impedance Spectroscopy. The tracer diffusivities can be described by a single Arrhenius line over ten orders of magnitude with an activation enthalpy of 1.33 eV, which corresponds to the migration energy of a single Li vacancy. A deviation from the Arrhenius behaviour at low temperatures, e.g., due to defect cluster formation is not observed. © 2014 the Owner Societies.
CITATION STYLE
Hüger, E., Rahn, J., Stahn, J., Geue, T., Heitjans, P., & Schmidt, H. (2014). Lithium diffusion in congruent LiNbO3 single crystals at low temperatures probed by neutron reflectometry. Physical Chemistry Chemical Physics, 16(8), 3670–3674. https://doi.org/10.1039/c3cp54939a
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