Characterization of bond formation in SiC and Si3N4 implanted with Ti, Fe, and Co

2001 ◽  
Vol 16 (2) ◽  
pp. 512-523 ◽  
Author(s):  
Didier Zanghi ◽  
Agnès Traverse ◽  
Sébastien Gautrot ◽  
Odile Kaïtasov
Keyword(s):  
Absorption Spectroscopy ◽  
Bond Formation ◽  
Local Environment ◽  
Heat Of Reaction ◽  
X Ray ◽  
Implantation Process ◽  
X Ray Absorption

Ti, Fe, and Co ions were implanted in two ceramics, SiC and Si3N4, to reach concentrations on the order of 10% over a depth of about 50–60 nm. X-ray absorption spectroscopy was performed at the K edge of the implanted ions to identify their local environment at the end of the implantation process. Ti was found to form Ti–C and Ti–N bonds whereas Co and Fe precipitated and formed clusters in Si3N4. CoSi was detected in SiC whereas, in the same matrix, Fe clusters coexist with FeSi. A coherent interpretation of these results is given in terms of the heat of reaction for all possible systems. We also successfully interpret in the same way some results found in literature in the case of implanted oxides.

Titanium environment in TiO2–BaO–ZnO–B2O3 glasses by x-ray absorption spectroscopy

2000 ◽  
Vol 15 (3) ◽  
pp. 793-797 ◽  
Author(s):  
N. Watanabe ◽  
A. Y. Ramos ◽  
M. C. M. Alves ◽  
H. Tolentino ◽  
O. L. Alves ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
Local Environment ◽  
Titanium Content ◽  
Optical Performance ◽  
X Ray ◽  
X Ray Absorption

The local environment of titanium in glasses of the system TiO2–BaO–ZnO–B2O3 was studied by x-ray absorption spectroscopy. In all glasses, for TiO2 content varying from 35 to 49 mol%, the titanium atoms are mainly fourfold coordinated network formers. For the glass with the highest titanium content, about 20% of the titanium enters into a sixfold environment, indicating the presence of precrystalline nuclei. These nuclei are responsible for the decrease of the optical performance of the glass above threshold titanium content, prior to any observable crystallization.

Characterization of an Oxo(porphyrinato)manganese(IV) Complex by X-ray Absorption Spectroscopy

1995 ◽  
Vol 34 (3) ◽  
pp. 343-346 ◽  
Author(s):  
John M. Charnock ◽  
C. David Garner ◽  
Alfred X. Trautwein ◽  
Eckard Bill ◽  
Heiner Winkler ◽  
...  
Keyword(s):  
Absorption Spectroscopy ◽  
X Ray ◽  
X Ray Absorption
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