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3.4 Weak Beam Contrast of Stacking Faults in TEM |
| | 3.4.1 Background |
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I can't say more than what I already did in the overview
of content: |
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This is a „on the side“ topic that let to a highly technical paper (No.
16 on the list) for which Barry Carter did most of the work. I wouldn’t have included it here except for a special
reason: It contains the first HRTEM picture that was actually taken to solve a problem! The problem was that stacking faults
showed unexpected contrast behavior under certain conditions but that it was usually not quit clear if what you saw really
was a stacking fault or, e.g. a micro-twin. Read the paper if you want to know more. By some fancy preparations and TEM
work, I was able to show by HRTEM tha the defect we investigated was indeed a intrinsic / extrinsic stacking fault combination.
My former Ph. D advisor M Wilkens supplied the theory.
The picture shows it all: Two intrinsic and one extrinsic stacking
fault meet at the dark area.
The paper actually caused some discussion and "comments" in the literature; see,
e.g., No 39 in my publication list. |
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To th euninitiated this mya look like some minor details but bear in mind that
what you see in a TEM is a highly abstract thing that can cause in many quite dufferent pictures. What, in your opinion,
should a stacking fault actually look like? It is important that the TEM users are able to interprete thier pictures unambigously.
And that is not always easy. |
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© H. Föll (Archive H. Föll)
