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Characterization of nanophase powders prepared by laser synthesis
Author(s) -
Giorgi R.,
Martelli S.,
Turtù S.,
Zappa G.,
Borsella E.,
Botti S.
Publication year - 1994
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.740220154
Subject(s) - silicon , ternary operation , materials science , x ray photoelectron spectroscopy , silicon carbide , auger electron spectroscopy , nitride , silicon nitride , carbide , analytical chemistry (journal) , aluminium , auger , carbon fibers , characterization (materials science) , chemical engineering , metallurgy , nanotechnology , chemistry , composite material , atomic physics , composite number , physics , layer (electronics) , chromatography , computer science , nuclear physics , engineering , programming language
Sibased (SiCN and SiCAl) nanopowders prepared by laser synthesis process have been studied by XPS and XAES analyses. The changes of the silicon coordination as a function of the carbon fraction in SiCN powders have been investigated by a detailed analysis of Si 2p and Si KLL lines and the measurements of the Auger parameter E k (Si KLL) + E b (Si 2p). The non‐linear dependence of the Auger parameter on the carbon fraction has been interpreted as due to the formation of a carbonitride nanophase, indicating that the ternary powders are not merely a mixture of silicon carbide and silicon nitride. In SiCAl powders it has been found that the incorporation of aluminium results in a modified structure of the silicon carbide, as shown by the variation of the different spectral features.