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Effect of temperature on chromium segregation to CoO(100) and NiO(100) surfaces
Author(s) -
Hirschwald W.,
Sikora I.,
Stolze F.,
Oblakowski J.
Publication year - 1989
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.740140809
Subject(s) - non blocking i/o , chromium , annealing (glass) , atmospheric temperature range , x ray photoelectron spectroscopy , analytical chemistry (journal) , materials science , chemistry , metallurgy , thermodynamics , chemical engineering , biochemistry , physics , chromatography , engineering , catalysis
Surface concentrations of chromium in CoOCr 2 O 3 and NiOCr 2 O 3 single crystals in dependence on bulk concentration and annealing temperature were determined by means of SIMS and XPS. From the temperature dependence, the heat of segregation Δ H s was calculated. Its value changed with bulk Cr concentration in the CoOCr 2 O 3 system, whereas for the NiOCr 2 O 3 system Δ H s was found to be constant in the whole range of bulk concentrations and temperatures studied.