Abstract
The chemical nature of the intrinsic surface layer in BaTiO 3 single crystals and the positive and negative surfaces of gadolinium molybdate have been determined using AES and ISS. Potassium and fluorine were detected in BaTiO 3 crystals grown by the Remeika method. The ratio of the AES 417 eV to 411 eV peaks of Ti in BaTiO 3 was stable under ion and electron beam irradiation. ISS showed that the positive and negative surface of gadolinium molybdate crystals were chemically identical, with both types exhibiting similar variations in the Gd and Mo signals with ion bombardment time. However, marked differences in the spectra of sputtered and scattered ions from each type were observed.
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