IYPT 2019 Elements 065: Terbium: Sonar, green light and triboluminescence

Element 65 in our International Year of the Periodic Table series is terbium. Terbium and its compounds are used in sonar and phone and TV screens, and some of its compounds have the interesting property of being triboluminescent. An alloy of terbium, dysprosium and iron, terfenol-D, has the unusual property of changing shape in magnetic […]