Uses & Applications

Applications and End-Uses for Terbium

Terbium (Tb) is a high-criticality rare earth element with annual global production of approximately 320 tonnes REO. Terbium is a heavy rare earth element used alongside dysprosium to enhance the high-temperature performance of neodymium permanent magnets. It produces the brightest known green phosphor and is used in Terfenol-D, a magnetostrictive alloy for sonar systems and precision actuators. Terbium is among the most supply-critical rare earths due to very limited production outside China and Myanmar.

Key Applications

The primary end-uses of Terbium span multiple sectors. The following applications represent the most significant sources of global demand:

• Permanent magnets (NdFeB additive) - Terbium is valued in permanent magnets (ndfeb additive) for its unique physical and chemical properties that are difficult to replicate with alternative materials.
• Green phosphors for displays - Key alternatives include Europium-doped alternatives, organic emitters. Terbium produces the most efficient narrow-band green phosphor; demand has declined with LED transition but no replacement matches its spectral purity
• Solid-state devices - Terbium is valued in solid-state devices for its unique physical and chemical properties that are difficult to replicate with alternative materials.
• Magnetostrictive alloys (Terfenol-D) - Key alternatives include Galfenol (Fe-Ga alloy). Galfenol is a terbium-free magnetostrictive alloy under development; lower performance than Terfenol-D but avoids rare earth supply risk for sonar and sensor applications

Product Forms and Specifications

Terbium is commercially available in 3 primary product forms, each serving different industrial requirements:

Demand Outlook

Terbium appears on both the USGS Critical Minerals List and the EU Critical Raw Materials List, underscoring its strategic importance across Western economies. Growing demand from electrification, digitalization, and defense modernization is expected to place additional pressure on the Terbium supply chain through the end of this decade.