School of Physics Lecture Demonstration Manual

Eh-1 Curie Point of Gadolinium

Published: Tuesday 14 March 2006 - Updated: Tuesday 29 March 2011

Aim

To demonstrate the disappearance of ferromagnetism in Gadolinium above a certain temperature called the Curie Point.

Apparatus

Diagrams

Click on pictures to enlarge.

Curie Point Diagram

Description

Gadolinium has a Curie Point temperature of 17°C. At this temperature it loses its ferromagnetism and becomes paramagnetic. This is illustrated by suspending a thin sheet of Gadolinium from a retort stand. It is attracted to a permanent magnet. The heat from a 100W light globe is sufficient to raise its temperature above its Curie Point whereupon the strong magnetism of the Gadolinium disappears.

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