Lect26_notes

23 etching polishing including electropolishing

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Unformatted text preview: are scattered from the very near surface •  Mechanical damage in top layer can preclude the formation of the Kossel cones that create the Kikuchi pattern CBEMS 164 – XRD, SEM & Microanalysis: Lecture 26 ! 22 Mounting to an Al Stub! ! ! ! ! ! ! •  Can use: –  Conducting paint –  Conducting double stick carbon paint –  Superglue / crystal bond •  Must ensure a conducting pathway to ground exists. –  Carbon paint or silver paint –  Double stick carbon tape/pads not mechanically stable   Remember – carbon and silver paint both need time to dry – outgassing organic solvents in the SEM vacuum is NOT OK!!! Once mounted, can consider plasma cleaning CBEMS 164 – XRD, SEM & Microanalysis: Lecture 26 ! 23 Etching! ! ! ! ! ! ! •  Polishing (including electropolishing) leaves a sample with no topology –  Phase (Z) contrast may be possible with BS imaging •  Samples can be etched to reveal features (e.g. grain boundaries) –  Thermal etching - heating –  Chemical etching –  Ion beam etching - impinging ion beam of specimen surface CBEMS 164 – XRD, SEM & Microanalysis: Lecture 26 ! 24 Recipes for Chemical Etching! ! ! ! ! ! ! •  Al (e...
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This note was uploaded on 01/16/2014 for the course CBEMS 164 taught by Professor Porter,j during the Fall '08 term at UC Irvine.

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