Terbium - Periodic Table of Videos
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The team at periodicvideos has created a TED-Ed Lesson for every element of the periodic table. In this video, discover terbium from the Ytterby quarry in Sweden.
The alloy of terbium, named terfenol, has the unusual property of expanding and contracting when exposed to magnetic fields. For this reason, it is used in actuators, naval sonar systems, and sensors.
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