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Nature of the surface layer in ABO3-type perovskites at elevated temperatures

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Abstract

X-ray diffraction measurements showed that in the surface layer of perovskite structure BaTiO3, SrTiO3, PbTiO3 and KNbO3 crystals at elevated temperatures (500–1000°C) reactions take place in the solid phase, associated with segregation in the direction to the surface of AO complexes, leading to the formation of a whole homologue series of crystalline compounds with the general formula AO · (ABO3) n ,n = l, 2,....., 10, ∞ Lowered oxygen partial pressure may inhibit the segregation processes and in the range of temperatures for which vaporisation of the AO complexes from the surface does not yet take place a suitable choice of oxygen pressure may lead to resynthesis of the compound.

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Szot, K., Pawelczyk, M., Herion, J. et al. Nature of the surface layer in ABO3-type perovskites at elevated temperatures. Appl. Phys. A 62, 335–343 (1996). https://doi.org/10.1007/BF01594231

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