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Surface Modification of ZnAg Sample - Sample Preparation for SEM

Application Note for Leica EM RES102 - Material Research

By means of cleaning, polishing and contrast enhancement a soft ZnAg sample should be prepared to obtain information concerning the grain structure and interfaces of the sample.

The sample is contaminated after mechanical polishing. There are still some scratches on the surface. Grain structure is almost invisible. Cleaning, polishing and contrast enhancement are successively carried out.

The deep scratch in the sample is just to recognize the same sample area after each preparation step.

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Preparation Conditions and Results

Mechanical polishing

Cleaning

Acceleration voltage:3 kV
Gun current:1.8 mA
Milling angle:10°
Milling time:30 min

 

Result
The surface looks much better after cleaning (see Fig.2). It was possible to remove all contamination from the sample. A weak grain structure is visible.

Polishing

Acceleration voltage:7 kV
Gun current:2.6 mA
Milling angle:
Milling time:1 h


Result
We could achieve further improvement of the surface quality after polishing. The grain structure looks clearer (see Fig.3).

Contrast Enhancement

Acceleration voltage:4 kV
Gun current:1.8 mA
Milling angle:90°
Milling time:1.5 min

 

Result
The last short contrast enhancement step provides a very clear grain and interface structure.