Cathodoluminescence Deep Level Spectroscopy of Etched and In-Situ Annealed 6H-SiC

1998 ◽  
Vol 512 ◽  
Author(s):  
A. P. Young ◽  
K. Aptowitz ◽  
L. J. Brillson
Keyword(s):  
Electron Beam ◽  
Deep Level ◽  
Surface Region ◽  
Energy Electron ◽  
Temperature Dependent ◽  
Near Surface ◽  
Electron Beam Excitation ◽  
Beam Excitation ◽  
Variable Energy

ABSTRACTThrough variable-energy electron beam excitation (0.5 keV-2.0 keV), we observe depth dependent differences in the cathodoluminescence spectra of 6H-SiC (0001) Si-terminated surfaces. The etched SiC exhibits three deep level defects in the near-surface region, including a defect peak observed at 0.92 eV, known to be associated with vanadium. In-situ annealing produces a dramatic relative decrease in the luminescence from vanadium impurities near the surface after annealing to 500 °C, and then the subsequent re-emergence of vanadium in the nearsurface regime after annealing to 810 °C. This temperature-dependent redistribution suggests either diffusion or segregation of vanadium from the bulk up toward the near-surface region.

Application of low energy electron beam excitation of dense gases and liquids for astro-particle physics

2011 ◽  
Vol 24 (3) ◽  
pp. 288-293
Author(s):  
A. Ulrich ◽  
T. Heindl ◽  
R. Krücken ◽  
T. Marrodan Undagoitia ◽  
A. Morozov ◽  
...  
Keyword(s):  
Electron Beam ◽  
Particle Physics ◽  
Low Energy ◽  
Energy Electron ◽  
Dense Gases ◽  
Electron Beam Excitation ◽  
Low Energy Electron ◽  
Beam Excitation

Nanoscale Mechanical Properties of In-Situ Tribofilms Generated from ZDDP and F-ZDDP with and without Antioxidants

2007 ◽  
Vol 7 (12) ◽  
pp. 4378-4390 ◽  
Author(s):  
Anuradha Somayaji ◽  
Ramoun Mourhatch ◽  
Pranesh B. Aswath
Keyword(s):  
Electron Microscopy ◽  
Wear Debris ◽  
Surface Region ◽  
Nucleation And Growth ◽  
Near Surface ◽  
Transmission Electron ◽  
Dialkyl Dithiophosphates ◽  
Wear Tests ◽  
Diphenyl Amine

Tribofilms with thickness ranging from 100–200 nm were developed in-situ during wear tests using a zinc dialkyl dithiophosphates (ZDDP) and fluorinated ZDDP (F-ZDDP). The influence of the antioxidant alkylated diphenyl amine on the formation and properties of these tribofilm is examined. Results indicate that the thickness of the tribofilms formed when F-ZDDP is used is always thicker than the tribofilm formed with ZDDP. In addition, in the presence of antioxidants the tribofilm thickness is increased. The hardness of these tribofilms in the absence of the antioxidants is significantly higher at the near surface region (0–30 nm) when compared to the films formed in the presence of antioxidant. Nanoscratch tests conducted to examine the abrasion resistance of the tribofilms also indicate that the tribofilms formed by F-ZDDP are more resistant to scratch compared to films formed by ZDDP. In the presence of antioxidant, tribofilms formed by F-ZDDP are significantly thicker while both films behave in a similar fashion in nanoscratch tests. Transmission electron microscopy of the wear debris formed during the tests were examined and results indicate the nucleation and growth of nanoparticles of Fe3O4 with an approximate size of 5–10 nm embedded within an otherwise amorphous tribofilm.

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