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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Veröffentlicht in:	Journal of the European Ceramic Society 2001, Vol.21 (10-11), p.1677-1680
Hauptverfasser:	HAN WEI, BEUERMANN, L, HELMBOLD, J, BORCHARDT, G, KEMPTER, V, LILIENKAMP, G, MAUS-FRIEDRICHS, W
Format:	Artikel
Sprache:	eng
Schlagworte:	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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Zusammenfassung:	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