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Terbium Compounds
   Terfenol-D
Terfenol-D Tb0.3Dy0.7Fe1.9
The alloy has an extremely high magnetostriction; it expands and contracts in magnetic fields. It sees application in magnetomechanical sensors, actuators, and acoustic and ultrasonic transducers or in naval sonar systems.
Developed in the 1950's at the Naval Ordnance Laboratory in America. It is named after terbium, iron (Fe), Naval Ordnance Laboratory (NOL), and the D comes from dysprosium.