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- W2087127987 abstract "The effect of ferroelectric poling direction on the structure and electronic properties of the LiNbO3 (0 0 0 1) surface was characterized. Low energy and reflection high energy electron diffraction indicated that both the positively and negatively poled surfaces were (1 × 1) with no evidence of longer range periodic reconstructions. Low energy ion scattering spectra from both surfaces were dominated by scattering from oxygen atoms. X-ray and ultraviolet photoelectron spectra also showed little difference between the positively and negatively poled surfaces, with the exception of a high binding energy shoulder on the O 1s core level of the negative surface. Exposure of the surfaces to atomic hydrogen caused reduction of the surface Nb rather than an increase in intensity on the high binding energy side of the O 1s peak, indicating that the shoulder on the O 1s peak on the negative surface was not due to surface hydroxyl groups. Temperature programmed desorption measurements indicated that the nearly stoichiometric LiNbO3 samples were susceptible to loss of Li2O starting at temperatures as low as 500 K, independent of the poling direction. An adatom/vacancy model is proposed in which oxygen ad-anions accumulate on one side of the crystal while oxygen anion vacancies are created on the opposite surface. This model can explain the apparent oxygen termination of both surfaces and the observed (1 × 1) periodicity of the surfaces, and also effectively screens the thickness dependent electric field associated with the polar orientation of the crystal." @default.
- W2087127987 created "2016-06-24" @default.
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- W2087127987 date "2007-10-01" @default.
- W2087127987 modified "2023-10-09" @default.
- W2087127987 title "Geometric and electronic structure of positively and negatively poled LiNbO3 (0 0 0 1) surfaces" @default.
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- W2087127987 doi "https://doi.org/10.1016/j.susc.2007.08.001" @default.
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