NO adsorption on a single crystal and a polycrystalline powder of LiNbO3
- 1 January 1998
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions
- Vol. 94 (15) , 2213-2216
- https://doi.org/10.1039/a801308j
Abstract
NO has been adsorbed as NO2 − and NO3 − on an LiNbO3 single crystal at room temperature. NO− was observed in the XPS spectrum for the N 1s level of the LiNbO3 single crystal after exposure at 200 and 400 °C, respectively. An LiNbO3 polycrystalline powder had only a peak from NO3 − after exposure between room temperature and 400 °C. The oxygen vacancies of lattice oxygen were produced with both LiNbO3 samples after exposure at room temperature. These oxygen vacancies in the LiNbO3 single crystal were partially refilled with NO− after exposure at 200 and 400 °C. On the other hand, the vacancies associated with the polycrystalline powder were partially refilled by the out-diffusion of oxygen ions from the bulk to the surface after exposure at 200 and 400 °C. The ions of lithium and oxygen in the bulk LiNbO3 polycrystalline powder diffuse more easily to its surface than those present in the LiNbO3 single crystal.Keywords
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