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

• DOI: 10.1007/bf01594231
• Publication Date: 2005-04-28T20:32:11Z
• Authors: K. Szot; M. Pawelczyk; J. Herion; Ch. Freiburg; J. Albers; R. Waser; J. Hulliger; J. Kwapulinski; J. Dec
• Keywords: 02 engineering and technology; 0210 nano-technology

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.