Pictures to: 2.3 Swirl Defects in Si (Investigated in a HVTEM)

Part 3
 

 
Months after I thought I was done with archiving the swirl work, I found another file full of pictures not yet selected. Here is a small number of these finds.
 
First, a few optical pictures showing the swirl pattern on our 33 mm FZ crystals. The pulling speed is also indicated.
   
 
Swirl defects in Si
Probably <100> oriented
   
 
Swirl defects in Si
Probably 111 >oriented
   
 
Swirl defects in Si
At the lowest growth speed dislocations were generated
   
One more example to specimens preparation
   
 
Swirl defects in Si
Top: 2.3 mm diamter specimen, though-light view
Bottom: Looking at the surface
   
 
Swirl defects in Si
Huge defect shown at two different diffraction conditions.
Here, as in other examples, the very long and straight dislocations dipoles are
decorated by second order agglomerates.
 
Swirl defects in Si
A rather weird assembly
Of course, the major part of this defect might have been etched out by specimen preparation, witness the etch pits.
 
Swirl defects in Si
Complex defect shown at two different diffraction conditions.
A simple unfaulted loop seems to be at the heart of the defect..
   
 
Swirl defects in Si
Complex defect shown at two different diffraction conditions.
.
   
Here are the links to the rest
     
   

Swirl pictures
Part 1
Part 2
     

With frame With frame as PDF

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© H. Föll (Archive H. Föll)