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XPS surface analyses of LaPO 4 ceramics prepared by precipitation with or without excess of PO 4 3−
Author(s) -
Jørgensen Sissel,
Horst Jens Anton,
Dyrlie Oddvar,
Larring Yngve,
Ræder Henrik,
Norby Truls
Publication year - 2002
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.1306
Subject(s) - x ray photoelectron spectroscopy , phosphate , precipitation , lanthanum , transmission electron microscopy , grain boundary , analytical chemistry (journal) , chemistry , conductivity , mineralogy , materials science , nuclear chemistry , inorganic chemistry , crystallography , chemical engineering , microstructure , nanotechnology , environmental chemistry , physics , organic chemistry , meteorology , engineering
Lanthanum phosphate (LaPO 4 ) powders were synthesized by precipitation with and without excess of phosphate and sintered at 1450° C. Bulk and surfaces of different origin and treatments were investigated using powder x‐ray diffraction, transmission electron microscopy and x‐ray photoelectron spectroscopy. The XPS data are reported and interpreted in some detail, and they indicate that phosphate excesses do remain in surfaces and appear to be accompanied by sodium accumulated in the surface from an unknown source. It is likely that grain boundaries are similarly phosphate enriched and a generally higher electrical conductivity of phosphate‐excess LaPO 4 samples is discussed in view of this. Copyright © 2002 John Wiley & Sons, Ltd.
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