Surface sensitivity of low energy electron Mössbauer spectroscopy (LEEMS) using57Fe

1992 ◽  
Vol 69 (1-4) ◽  
pp. 819-822 ◽  
Author(s):  
G. Klingelhöfer ◽  
U. Imkeller ◽  
E. Kankeleit ◽  
B. Stahl
Keyword(s):  
Mössbauer Spectroscopy ◽  
Mossbauer Spectroscopy ◽  
Low Energy ◽  
Energy Electron ◽  
Surface Sensitivity ◽  
Mößbauer Spectroscopy ◽  
Low Energy Electron

Precipitation of Copper and Cobalt at Grain Boundaries in Silicon

1989 ◽  
Vol 163 ◽  
Author(s):  
U. Jendrich ◽  
H. J. Möller
Keyword(s):  
Particle Size ◽  
Mössbauer Spectroscopy ◽  
Grain Boundary ◽  
Grain Boundaries ◽  
Cooling Rate ◽  
Polycrystalline Silicon ◽  
Mossbauer Spectroscopy ◽  
Low Energy ◽  
Surface Source ◽  
Mößbauer Spectroscopy

AbstractThe precipitation of copper and (radioactive) cobalt at low energy grain boundaries in polycrystalline silicon and bicrystals is investigated. The metals are diffused in from a surface source between 800 - 1000 °C and the precipitation after cooling down is studied by TEM (for Cu) and Mößbauer spectroscopy (for Co). The precipitates are metal suicides. For copper it is shown that they appear in form of colonies containing hundreds of precipitates with a particle size between 5-60 nm. In the grain boundary they nucleate preferentially at dislocations and steps. The distribution and size of the precipitates depend on the cooling rate after the diffusion. In the vicinity of the grain boundary the volume is depleted from the impurities.

In Situ Nitride Growth Studies by Low Energy Electron Microscopy (LEEM) and Low Energy Electron Diffraction (LEED)

1997 ◽  
Vol 3 (S2) ◽  
pp. 611-612
Author(s):  
E. Bauer ◽  
A. Pavlovska ◽  
I.S.T. Tsong
Keyword(s):  
Low Energy ◽  
Energy Electron ◽  
Ex Situ ◽  
Electron Microscopic ◽  
Insulating Layer ◽  
Light Emitting ◽  
Surface Sensitivity ◽  
Microscopic Studies ◽  
Low Energy Electron

Nitride films play an increasing role in modern electronics, for example silicon nitride as insulating layer in Si-based devices or GaN in blue light emitting diodes and lasers. For this reason they have been the subject of many ex situ electron microscopic studies. A much deeper understanding of the growth of these important materials can be obtained by in situ studies. Although these could be done by SEM, LEEM combined with LEED is much better suited because of its excellent surface sensitivity and diffraction contrast. We have in the past studied the high temperture nitridation of Si(l11) by ammonia (NH3)and the growth of GaN and A1N films on Si(l11) and 6H-SiC(0001) by depositing Ga and Al in the presence of NH3 and will report some of the results of this work for comparison with more recent work using atomic nitrogen instead of NH3.

Silicide Formation at Fe-Si Interfaces Studied by Mössbauer Spectroscopy and Rutherford Backscattering

1980 ◽  
Vol 3 ◽  
Author(s):  
R. L. Cohen ◽  
L. C. Feldman ◽  
K. W. West ◽  
P. J. Silverman
Keyword(s):  
Mössbauer Spectroscopy ◽  
Room Temperature ◽  
Mossbauer Spectroscopy ◽  
Rutherford Backscattering ◽  
Silicide Formation ◽  
Substrate Preparation ◽  
Surface Sensitivity ◽  
Mößbauer Spectroscopy ◽  
Natural Iron ◽  
Enhanced Surface

EXTENDED ABSTRACTWe have deposited the Mössbauer isotope Fe 57 on (111) Si surfaces at room temperature and measured the Mössbauer spectrum using conversion electron Mössbauer spectroscopy for enhanced surface sensitivity. Samples were examined as a function of substrate preparation and thermal anneal. Rutherford backscattering was used to monitor sample preparation. The Fe 57 layers have been coated with natural iron (2.2% Fe 57) or silver to prevent them from oxidizing when exposed to air. The known distinctive Mössbauer spectra of Fe, FeSi, FeSi 2 , Fe in Si, and Si in Fe allows the identification of these phases in the samples.

scholarly journals An X-ray Diffraction and Mössbauer Spectroscopy Study of the Reaction between Hematite and Aluminum Activated by Ball Milling

1998 ◽  
Vol 53 (5) ◽  
pp. 239-244 ◽  
Author(s):  
Giorgio Concas ◽  
Anna Corrias ◽  
Enrico Manca ◽  
Giaime Marongiu ◽  
Giorgio Paschina ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
Ball Milling ◽  
Mossbauer Spectroscopy ◽  
Low Energy ◽  
Al Alloy ◽  
Spectroscopy Study ◽  
X Ray Diffraction ◽  
Powder Mixtures ◽  
X Ray ◽  
Mößbauer Spectroscopy

Abstract The reaction between hematite and aluminum in presence of allumina as diluent activated by Ball Milling powder mixtures in different energetic conditions has been investigated. To this purpose, the powders at different milling times have been characterized by X-ray Diffraction and Mössbauer Spectroscopy. A self-substained combustion reaction was observed when the strongest energetic conditions of milling were adopted. The intermediate products of the reaction also depend on the energetic conditions: the formation of hercynite is favoured by the use of strong energetic conditions while the formation of an Fe-Al alloy was observed when a low energy per single hit is transferred to the powders.

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