Terbium (symbol Tb, atomic number 65) is a heavy rare earth element (HREE) and one of the most commercially significant — and expensive — in the NdFeB permanent magnet supply chain. As of March 2026, terbium oxide traded at $1,182.00/kg FOB China per Shanghai Metals Market (SMM) data, placing it among the highest-priced magnet rare earths by weight. Classified as critical by the US, EU, and Japanese governments, terbium supply remains almost entirely dependent on a single country.
What Is Terbium and Where Does It Come From?
Terbium is a silvery-white metal belonging to the lanthanide series. It occurs naturally in ionic clay deposits concentrated in Jiangxi and Fujian provinces in southern China, and in hard rock mineral assemblages including bastnäsite and monazite. China accounts for approximately 85–90% of global terbium production, according to USGS Mineral Resources Program data. Southern China’s ionic clay deposits — the primary commercial source of heavy rare earths — are subject to progressive depletion, adding structural pressure to long-term supply.
Outside China, commercially significant separation of terbium oxide remains limited. Lynas Rare Earths (ASX: LYC) and MP Materials (NYSE: MP) — the two largest non-Chinese rare earth producers — do not yet produce separated terbium oxide at commercial scale.
What Is Terbium Used For?
The dominant commercial application for terbium is as a performance additive in NdFeB permanent magnets. Added in small quantities, terbium improves coercivity — the magnet’s resistance to demagnetisation at elevated operating temperatures. This property is critical for EV traction motors and direct-drive wind turbine generators, both of which operate in high-heat environments. Terbium works in combination with dysprosium, the other principal heavy rare earth additive in high-performance NdFeB magnets; the two elements are often used together, with the precise blend determined by operating temperature requirements and relative cost.
While terbium is used in smaller absolute quantities than dysprosium in magnet manufacturing, it commands a higher price per kilogram. The second significant application is in terbium-doped phosphors — green-emitting phosphors used in fluorescent lighting, colour displays, and solid-state lighting systems. Terbium also appears in magneto-optical data storage and as an activator in green phosphors for specialist display applications. Defence and sonar systems provide additional demand through terbium’s use in magnetostrictive alloys.
What Is Driving Terbium Demand in 2026?
NdFeB magnet demand from EV motors and offshore wind turbines is the primary long-term growth driver for terbium, directly mirroring the demand trajectory for dysprosium. Both elements are sourced from the same southern Chinese ionic clay deposits and face the same supply constraints.
The transition from fluorescent lighting to LED technology has reduced phosphor-related terbium demand over the past decade. However, magnet applications have more than compensated: analysts at Adamas Intelligence project NdFeB magnet demand to grow significantly through 2030, with heavy rare earth additives including terbium and dysprosium among the tightest components in the supply chain.
Terbium Price and Market Structure
Terbium oxide traded at $803.96/kg domestic China and $1,182.00/kg FOB China as of March 2026, per Shanghai Metals Market (SMM) benchmark data. The spread between domestic and export pricing reflects China’s export licensing regime and logistics costs. For current spot data and historical price series, see the terbium price tracker.
As with dysprosium, terbium is traded primarily through long-term offtake agreements between Chinese producers and magnet manufacturers. Spot market liquidity is limited, and published benchmark prices should be treated as indicative rather than transactable.
Terbium Supply Chain: The Western Gap
Western government programmes targeting heavy rare earth independence explicitly include terbium alongside dysprosium as priority elements. The US Department of Defense has funded feasibility work on HREE separation capacity, and the EU Critical Raw Materials Act identifies terbium as a strategic raw material. Despite this, no Western project had reached commercial-scale separated terbium oxide production as of early 2026.
The timeline constraint is processing infrastructure, not resource availability. Ionic clay deposits with terbium content exist in Australia, Brazil, and parts of Africa, but the hydrometallurgical separation facilities required to produce oxide-grade material at commercial scale represent a capital and technical barrier that most non-Chinese projects have not yet cleared.
Terbium Outlook 2026
Terbium’s price and supply dynamics are structurally linked to dysprosium — both are heavy rare earths extracted from the same deposit type, with the same dominant producer geography and the same end-use demand drivers. Any sustained increase in EV production volumes or wind turbine deployment tightens demand for both elements simultaneously. Supply diversification remains a multi-year project. For investors and procurement teams tracking magnet rare earth exposure, terbium and dysprosium should be assessed as a paired risk.
This article is for informational purposes only and does not constitute investment advice. Prices are subject to change without notice.
What is terbium used for?
Terbium’s primary commercial use is as a high-temperature performance additive in NdFeB permanent magnets, where it improves coercivity alongside dysprosium. It is also used in terbium-doped phosphors for fluorescent lighting and displays, magneto-optical data storage, and defence sonar systems.
What is the current terbium price per kg?
As of March 2026, terbium oxide traded at $803.96/kg domestic China and $1,182.00/kg FOB China per Shanghai Metals Market (SMM) benchmark data. See the terbium price tracker at /terbium-price/ for current and historical data.
Why is terbium so expensive?
Terbium is expensive because supply is highly concentrated — China accounts for approximately 85–90% of global production from ionic clay deposits in southern China that are progressively depleting. Demand is growing from EV and wind turbine magnet applications, and no Western producer yet separates terbium oxide at commercial scale
Who produces terbium?
China dominates global terbium production, primarily from ionic clay deposits in Jiangxi and Fujian provinces. Lynas Rare Earths (ASX: LYC) and MP Materials (NYSE: MP) are the largest non-Chinese rare earth producers but do not yet produce separated terbium oxide at commercial scale.
What is the difference between terbium and dysprosium?
Both are heavy rare earth additives used in NdFeB permanent magnets to improve high-temperature performance, and both are sourced primarily from southern Chinese ionic clay deposits. Terbium is used in smaller quantities but commands a higher price per kilogram. The two elements are frequently blended in magnet production depending on operating temperature requirements and cost.
