39
Sample Seeding with
Seeding Post
This allows a crystal to grow from a single point
from the Seeding Post (1). A small block of
silver mounted to the cooling inlet forms a cold
spot at –196ºC which acts as the seeding point in
the cooling procedure outlined below.
Make sure that the tube from the Dewar flask is
connected to the inlet pipe (2) which passes
through the seeding point
1. Prepare the sample as described in the manual
using a G16.
2. Adjust the X-Y manipulators so that the sam-
ple assembly is placed centrally on the silver
block.
3. Find out where the sample melts by freezing
the sample and then slowly heating (5C/min).
Note when the last crystal melts.
4. Use the X-Y manipulators move the sample
over to the seeding point.
5. Replace the lid and cool to between 0.5 and
1ºC above the melting point measured in step
3.
6. Leave the sample in this position for about 2
minutes and then move it back to the centre of
the silver block.
7. Slowly program the temperature to cool down
at about 5°/min or slower and observe the
crystals growing from the seeding point.
1
2
Sample moved over
the seeding point
Seeding Post
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