Electricity
and Magnetism > Magnetic Materials > Ferromagnetism
|
DCS#
5G50.10b |
CURIE POINT OF
GADOLINIUM
APPARATUS
piece of gadolinium
|
202-20-D5 |
| magnet |
202-20-D5 |
liquid nitrogen
|
202-11-B |
DESCRIPTION
The Curie
temperature
of gadolinium is 19° C. Cool the gadolinium chunk in liquid
nitrogen and suspend it from the magnet. As it warms to room
temperature it will drop from the magnet.
NOTES
With careful spacing
of the magnet and cup, it's possible to set the
chunk of gadolinium in the cup of LN2 and let it jump to the magnet
when it cools. When it warms past its Curie temperature, it will
fall
back into the cup. The cycle continues until the liquid nitrogen
evaporates.