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Hydrothermal Strontium Titanate Films on Titanium: An XPS and AES Depth‐Profiling Study
Author(s) -
Pilleux Mauricio E.,
Grahmann Carlos R.,
Fuenzalida Víctor M.
Publication year - 1994
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1994.tb09763.x
Subject(s) - x ray photoelectron spectroscopy , strontium titanate , hydrothermal circulation , titanium , materials science , analytical chemistry (journal) , strontium , mineralogy , carbon fibers , aqueous solution , auger , thin film , chemistry , chemical engineering , metallurgy , nanotechnology , composite material , environmental chemistry , organic chemistry , composite number , engineering , physics , atomic physics
SrTiO 3 films in the 100‐nm thickness range were grown on Ti foils by a 2–4 h hydrothermal treatment at 225°C in an aqueous solution of Sr(OH) 2 . X‐ray diffraction showed the principal reflections of cubic SrTiO 3 . Photoelectron analysis revealed the presence of carbon contamination and suggested the presence of hydroxyl groups on the surface, which disappeared in the film bulk. The Auger depth profiles showed three distinct zones. The outermost layer, besides the common carbon contamination, had a large number of OH groups. The second zone was a clean, almost carbon‐free SrTiO 3 film. The third zone was a diffuse interface region where the Sr and O concentrations slowly decreased toward the substrate.