What is yttrium? Yttrium (symbol Y, atomic number 39) is a silvery-white transition metal that spans some of the most commercially significant applications in modern technology — from LED lighting and cancer radiotherapy to solid oxide fuel cells and jet engine superalloys. Despite being grouped with the rare earth elements (REEs) in geology, processing, and trade, yttrium is technically not a lanthanide; it sits in Group 3 of the periodic table alongside scandium, above lanthanum in the column but outside the lanthanide series. This distinction matters less commercially than it does chemically — yttrium is mined alongside heavy rare earths (HREEs), processed in the same facilities, and subject to the same supply chain constraints.
What Is Yttrium? Classification and Properties
Yttrium has an atomic weight of 88.91 g/mol and a melting point of 1,522°C. In air, it forms a stable protective oxide layer — yttria (Y₂O₃) — which prevents further oxidation at ambient temperatures, though finely divided yttrium is pyrophoric. The metal is ductile, relatively soft, and has no significant radioactive isotopes in its natural form.
Geologically, yttrium occurs in xenotime (yttrium phosphate) and in the ion-adsorption clay deposits of Jiangxi province, China — the same deposits that supply the bulk of global dysprosium and terbium. It is also found in monazite and bastnäsite, typically as a minor constituent. Because yttrium behaves chemically like the heavy lanthanides and is concentrated in the same ore bodies, it is classified as a heavy rare earth element (HREE) for all practical commercial purposes.
Commercially, yttrium is traded primarily as yttrium oxide (Y₂O₃) — also called yttria — and as yttrium metal. China accounts for the large majority of global production, with secondary sources in Malaysia (xenotime from tin tailings), India, and a small number of Western projects.
Yttrium Uses in LED Phosphors
The dominant commercial application for yttrium is in LED phosphors. Yttrium aluminium garnet (YAG) doped with cerium (Ce:YAG) is the primary phosphor used to convert blue LED chip emissions into white light — the mechanism underpinning the vast majority of modern LED lighting. When blue photons from a gallium nitride (GaN) chip strike the YAG phosphor layer, the cerium ions absorb and re-emit at longer wavelengths, producing the warm-to-cool white spectrum familiar in household, commercial, and automotive lighting.
YAG’s dominance in LED phosphors stems from its chemical stability at elevated temperatures, high luminous efficiency, and compatibility with high-power chips. Each tonne of YAG phosphor requires significant yttrium oxide content — yttrium accounts for roughly 45% of the YAG crystal by weight. The LED transition from fluorescent and incandescent sources drove a structural shift in yttrium demand from the early 2000s onward. Older fluorescent lamp technology used yttrium vanadate (YVO₄) and yttrium oxide phosphors, which are less efficient but still found in legacy installations and certain display backlight applications.
Yttrium in Cancer Radiotherapy
Yttrium-90 (Y-90) is a beta-emitting radioisotope with a half-life of approximately 64 hours. It is the active agent in selective internal radiation therapy (SIRT), a minimally invasive procedure used to treat primary liver cancer (hepatocellular carcinoma) and colorectal cancer that has spread to the liver. In SIRT, millions of microscopic spheres loaded with Y-90 are delivered via catheter into the hepatic artery, where they lodge in the small vessels supplying the tumour and irradiate it from within over approximately two weeks.
Two commercial products dominate the market: SIR-Spheres, manufactured by Sirtex Medical, and TheraSphere, manufactured by Boston Scientific following its acquisition of BTG. Both are approved in major markets including the US, EU, and Australia. Clinical adoption has expanded steadily — SIRT is now included in major oncology treatment guidelines for select patient populations. The quantities of yttrium involved are tiny — micrograms per dose — but the purity requirements are extremely high and the value per kilogram of usable material is substantial, making this one of the most commercially significant medical isotope applications in the REE adjacent space.
Yttrium in Solid Oxide Fuel Cells
Yttria-stabilised zirconia (YSZ) is the standard electrolyte material in solid oxide fuel cells (SOFCs). Pure zirconia (ZrO₂) undergoes a phase transition on heating that renders it mechanically unstable; adding yttrium oxide at approximately 8 mol% stabilises the cubic crystal structure and introduces oxygen vacancies that enable high-temperature oxide ion conductivity. At operating temperatures of 700–1,000°C, YSZ allows O²⁻ ions to migrate through the electrolyte from the cathode to the anode, completing the electrochemical cycle that generates electricity.
Commercial SOFC manufacturers include Bloom Energy (NYSE: BE), whose Energy Servers power data centres and industrial facilities across the US and Japan, and Ceres Power (LSE: CWR), which licenses its steel cell SOFC technology to partners including Bosch and Doosan. SOFCs operate on natural gas, hydrogen, and biogas, making YSZ a material of growing interest as decarbonisation drives demand for high-efficiency distributed power and hydrogen-compatible generation. Volumes remain modest relative to magnet or phosphor applications, but strategic significance is rising.
Other Yttrium Applications
Microwave and Radar
Yttrium iron garnet (YIG) is a synthetic garnet with exceptional microwave properties — specifically, an extremely narrow ferromagnetic resonance linewidth that makes it the preferred material for microwave filters, oscillators, and circulators in radar and electronic warfare systems. YIG-tuned oscillators and bandpass filters are found in phased-array radar, electronic countermeasures, and satellite communications. Defence electronics demand high-purity YIG single crystals, which are a niche but strategically sensitive end-use.
Superalloys
Small additions of yttrium — typically in the form of yttrium oxide or as a master alloy — improve the oxidation resistance and hot corrosion resistance of nickel-based superalloys at elevated temperatures. This so-called reactive element effect strengthens the adherent alumina scale that protects the alloy surface in turbine environments. End-users include jet engine manufacturers and industrial gas turbine producers; major engine families from GE Aerospace and Rolls-Royce incorporate yttrium-bearing superalloy components in their hot sections.
Lasers
The Nd:YAG laser — neodymium-doped yttrium aluminium garnet — is one of the most widely used solid-state lasers globally, operating at 1,064 nm in the near-infrared. Applications span industrial metal cutting and welding, ophthalmology (laser eye surgery), dermatology, military rangefinding and target designation, and dental procedures. YAG is the host crystal; yttrium enables the stable garnet structure that allows efficient optical pumping. For context on neodymium’s role in this system, see our what is neodymium guide.
Yttrium Price and Supply Chain
Yttrium oxide trades at a mid-range price relative to the REE peer group — materially more expensive than lanthanum and cerium oxides, but significantly cheaper than the critical magnet elements terbium and dysprosium. Indicative market pricing as of early 2026 is shown below; note that yttrium is not tracked on the Shanghai Metals Market (SMM) primary price list, and pricing varies by purity grade and contract terms.
| Product | Indicative Price ($/kg) | Purity | Source / Notes |
|---|---|---|---|
| Yttrium Oxide (Y₂O₃) | $3–$5 | 99.9% | Estimated range, FOB China, early 2026 |
| Yttrium Metal | $25–$40 | 99.9% | Estimated range, FOB China, early 2026 |
| Yttrium-90 (medical grade) | Value per dose — not traded by kg | Radioisotope | Commercial product pricing via Sirtex / Boston Scientific |
For comparison, terbium traded above $970/kg domestic China in April 2026, and dysprosium at approximately $221/kg — illustrating the wide price dispersion across the HREE group. Yttrium oxide’s relatively modest price reflects its greater abundance in ion-adsorption clay deposits compared to the critical magnet HREEs.
China dominates global yttrium production via Jiangxi’s ion-adsorption clay deposits, processed primarily by state-affiliated groups. China Southern Rare Earth is one of the six major Chinese state-consolidated producers and a significant yttrium supplier. Outside China, Northern Minerals (ASX: NTU) is developing its Browns Range HREE project in Western Australia — yttrium is a meaningful co-product alongside dysprosium and terbium at that deposit. See the Northern Minerals profile for project status and timeline detail. Malaysia’s Lynas plant processes xenotime-bearing monazite that contains yttrium, though volumes are modest.
Is Yttrium a Critical Mineral?
Yttrium is listed as a critical raw material under the EU Critical Raw Materials Act and features on the US Department of Energy critical minerals list. The supply concentration risk is structurally identical to the HREE group: China’s Jiangxi deposits are the dominant global source, processed under the same MIIT production quota and export control framework that governs dysprosium and terbium. Disruption to Chinese HREE supply — whether through quota tightening, export licensing changes, or processing restrictions — would affect yttrium availability in parallel with the magnet metals.
For a broader overview of which minerals fall under China’s export control framework, see our analysis of the top 10 China export control minerals. For context on how yttrium fits within the wider REE family, see what are rare earth elements.
This article is for informational purposes only and does not constitute investment advice. Prices and data are subject to change without notice.
What is yttrium used for?
Yttrium’s primary uses are in LED phosphors (yttrium aluminium garnet, or YAG, converts blue LED light to white), cancer radiotherapy (yttrium-90 microspheres treat liver cancer via selective internal radiation therapy), solid oxide fuel cells (yttria-stabilised zirconia is the standard electrolyte), microwave and radar components (yttrium iron garnet), and as an additive in nickel superalloys for jet engines. Nd:YAG lasers, used in industrial cutting and surgery, also rely on a yttrium garnet host crystal.
Is yttrium a rare earth element?
Yttrium is grouped with the rare earth elements in geology, mining, and trade — it occurs in the same heavy rare earth ore deposits as dysprosium and terbium and is processed in the same facilities. Chemically, however, yttrium is a transition metal in Group 3 of the periodic table, not a lanthanide. In commercial and regulatory contexts, including EU and US critical minerals lists, yttrium is treated as a rare earth element.
What is yttrium-90 used for in medicine?
Yttrium-90 is a beta-emitting radioisotope used in selective internal radiation therapy (SIRT) to treat liver cancer, including hepatocellular carcinoma and colorectal liver metastases. Microspheres loaded with Y-90 are delivered via catheter into the hepatic artery, where they irradiate tumours from within over approximately two weeks. The two main commercial products are SIR-Spheres (Sirtex Medical) and TheraSphere (Boston Scientific).
Where is yttrium mined?
China accounts for the large majority of global yttrium production, primarily from ion-adsorption clay deposits in Jiangxi province — the same deposits that supply most of the world’s dysprosium and terbium. Secondary production comes from xenotime processing in Malaysia and monazite processing in India. Outside Asia, Northern Minerals’ Browns Range project in Western Australia is a notable development-stage source, where yttrium is a co-product alongside heavy rare earths.
What is the current yttrium price?
Yttrium oxide (Y₂O₃, 99.9% purity) is estimated at approximately $3–$5 per kg FOB China as of early 2026, based on available market data. Yttrium metal trades at a significant premium, in the $25–$40/kg range. Yttrium is not included in the Shanghai Metals Market’s primary daily price list, so prices should be confirmed directly with suppliers or specialist brokers. Medical-grade yttrium-90 is not traded by the kilogram — it is priced as a finished radiopharmaceutical product.
