Study of SrO segregation on SrTiO3(100) surfaces

Annealing as-received lanthanum doped (5 at% La) SrTiO3(100) single crystals in air at 1300 C for 120 h results in the formation of insulating islands on the surface which have typical dimensions of up to 50 micron. These surfaces were investigated by metastable impact electron spectroscopy (MIES),...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2001, Vol.21 (10-11), p.1677-1680
Main Authors: HAN WEI, BEUERMANN, L, HELMBOLD, J, BORCHARDT, G, KEMPTER, V, LILIENKAMP, G, MAUS-FRIEDRICHS, W
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Dielectric, piezoelectric, ferroelectric and antiferroelectric materials
Dielectrics, piezoelectrics, and ferroelectrics and their properties
Electrotechnical and electronic ceramics
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Niobates, titanates, tantalates, pzt ceramics, etc
Physics
Solubility, segregation, and mixing
phase separation
Technical ceramics
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Summary:Annealing as-received lanthanum doped (5 at% La) SrTiO3(100) single crystals in air at 1300 C for 120 h results in the formation of insulating islands on the surface which have typical dimensions of up to 50 micron. These surfaces were investigated by metastable impact electron spectroscopy (MIES), ultraviolet photoelectron spectroscopy (UPS), X-ray photoelectron spectroscopy (XPS), metastable impact electron emission microscopy (MIEEM) and photoelectron emission microscopy (PEEM). The insulating islands consist of stoichiometric SrO. Between these islands an additional Sr enrichment is found in the top surface layers. 15 refs.
ISSN:0955-2219
1873-619X
DOI:10.1016/S0955-2219(01)00091-7