7 Rare Metals That Power Chips, Batteries & Magnets

Gallium, germanium, indium and tantalum enable specialized electronic and optical components. Lithium carries charge in lithium-ion batteries; cobalt supports certain cathode chemistries. Neodymium helps make powerful permanent magnets. Their value comes from what a particular compound, alloy or component can do—not from rarity alone.

A device may use several of these materials, but it does not necessarily contain all seven. To understand its dependence, start with the component, its material specification and the alternatives that the design can accept.

Individual chip patterns on a six-inch semiconductor wafer — A wafer shows the manufactured component stage. Its appearance does not identify which of these seven elements a finished device contains. Photo: Armin Kübelbeck / Wikimedia Commons, CC BY-SA 3.0. Shown uncropped.

“Rare metals” does not mean “rare earths”

In industrial writing, rare metals is a loose label for materials used in smaller, specialized markets. It is not a single chemical family or a reliable measure of how much exists in the ground. A material can be difficult to source because recovery, refining or component production is limited.

Rare-earth elements are a defined group: the 15 lanthanides plus scandium and yttrium. Neodymium is the only rare-earth element in this seven-material list. Germanium is technically a metalloid, although industry often discusses it alongside minor or specialty metals. “Critical mineral” is a separate, policy-dependent designation concerned with economic importance and supply vulnerability. See the DOE explanation of rare earths and the RSC germanium profile.

The useful comparison is therefore element → functional material → component. Pure gallium is not a finished GaN transistor, and a neodymium-containing magnet is not a block of pure neodymium.

On small screens, scroll the table sideways. Keyboard users can focus it and use the arrow keys.

Material	Useful form	Where it contributes	What not to assume
Ga · Gallium	Gallium arsenide (GaAs); gallium nitride (GaN)	Selected radio-frequency, power and optoelectronic devices	Most chips are not made from gallium compounds.
Ge · Germanium	Metal, optical compounds and semiconductor materials	Infrared optics, fiber-optic glass and specialized electronics	Optical glass additives and infrared lenses require different forms.
In · Indium	Indium tin oxide (ITO); indium phosphide (InP)	Transparent electrodes and optical communications devices	A display electrode is not the same component as a processor.
Ta · Tantalum	Powder anode with tantalum oxide dielectric	Compact electrolytic capacitors	A tantalum capacitor is not interchangeable with any equal-value capacitor.
Li · Lithium	Lithium-containing electrode materials and electrolyte salts	Lithium-ion batteries, including LFP	Conventional lithium-ion cells do not require a bulk lithium-metal anode.
Co · Cobalt	Cobalt-containing cathode compounds	LCO, NMC and NCA battery families	LFP cathodes do not use cobalt.
Nd · Neodymium	Neodymium–iron–boron (NdFeB) magnet material	Selected motors, generators, speakers and actuators	Not every motor uses a rare-earth permanent magnet.

The element is only the starting point

A supplier must convert a recovered material into a form a factory can use. Semiconductor production needs controlled purity and crystal or layer properties. Capacitors need suitable powder and a reliable dielectric. Motors need a magnet grade, geometry and coating that suit the operating conditions.

This explains why available ore—or even available metal—does not automatically mean available qualified parts.

Silvery gallium metal inside a clear plastic bag held in a hand — Gallium metal must undergo further processing before it can serve in a semiconductor material. A photograph cannot establish device-grade purity. Photo: GOKLuLe 盧樂 / Wikimedia Commons, CC BY-SA 3.0. Shown uncropped.

Neodymium magnet mounted on a steel bracket from a computer hard drive — A hard-drive magnet assembly combines a magnet with a supporting bracket. Its total weight is not its neodymium content. Photo: Bloodshedder / Wikimedia Commons, public domain.

Four materials behind electronics and optics

These materials perform different jobs around an electronic system. Some form active semiconductor devices; others enable a display, lens or passive component.

Gallium: specialized semiconductors

Gallium compounds extend the options beyond silicon. GaAs is used in radio-frequency and optoelectronic devices; GaN serves applications including power switching, radio-frequency devices and light emitters. The compound and device structure determine the role. The metal alone does not provide a ready-made transistor.

Even “GaN” does not necessarily mean a bulk GaN wafer: a device can use GaN layers grown on a silicon or silicon-carbide substrate. Infineon’s comparison of GaN platforms explains this distinction.

For purchasing, identify the device family and approved fabrication route before treating another gallium supplier as a second source. The USGS gallium chapter also identifies a major upstream constraint: recovery is predominantly tied to bauxite processing, with some recovery from zinc-processing streams.

Germanium: light, signals and sensing

Germanium contributes to several optical and electronic supply chains. Germanium metal is used in infrared optics. Germanium compounds, including germanium tetrachloride and dioxide, are used in making optical-fiber glass. Specialized semiconductor applications use still other forms.

This distinction changes what “supply available” means. A source of germanium metal for infrared lenses does not automatically supply the high-purity chemical required for a fiber-production process. Match the material form, impurity limits and accepted manufacturing route to the actual purchase specification. These uses are described in the USGS germanium chapter.

Indium: transparent conductors and photonics

Indium tin oxide, usually called ITO, combines electrical conductivity with optical transparency. It is used in thin-film electrodes for displays and other optical devices. Indium also appears in compound semiconductors, including indium phosphide, and in some alloys and solders.

A transparent-electrode alternative must meet more than a conductivity target: optical transmission, film uniformity, patterning and adhesion matter to the finished product. For sourcing, distinguish a coating target from a semiconductor wafer or solder alloy. The USGS indium chapter identifies ITO as the leading global use and describes indium’s close connection to zinc-processing supply.

Tantalum: capacitance in a small package

A tantalum capacitor uses a porous tantalum anode covered with a thin tantalum pentoxide dielectric. The large internal surface area helps fit useful capacitance into a compact component. It supports the circuit as a passive part rather than acting as the processor itself. KYOCERA AVX explains this construction.

A replacement needs a circuit-level check. Capacitance and voltage ratings alone do not establish equivalence: consider equivalent series resistance, leakage, surge behavior, temperature, polarity and the manufacturer’s derating requirements. A ceramic, aluminum or polymer-based alternative can change how the circuit behaves.

Lithium and cobalt have different battery roles

Lithium participates in charge transfer

In a rechargeable lithium-ion cell, lithium ions move between the electrodes as the battery charges and discharges. The cell uses lithium-containing materials and electrolyte; “lithium-ion” does not mean that a conventional cell contains a bulk metallic-lithium anode.

Changing from a nickel-based cathode to lithium iron phosphate therefore does not remove lithium. It changes the cathode chemistry and its associated material needs.

Cobalt depends on the cathode chemistry

Cobalt is part of the cathode composition in lithium cobalt oxide (LCO), nickel manganese cobalt (NMC) and nickel cobalt aluminum (NCA) families. Its amount varies with the formulation. Lithium iron phosphate (LFP) cathodes use neither cobalt nor nickel.

Consequently, “this product uses lithium-ion batteries” is not enough to establish cobalt dependence. Ask for the cell model and declared chemistry. The DOE explanation of cobalt in cathodes and the Australian Government’s LFP comparison support this distinction.

18650 and 21700 cylindrical lithium-ion cells shown side by side — 18650 and 21700 describe cell formats. Format alone does not establish cathode chemistry or cobalt content. Photo: Sevenethics / Wikimedia Commons, CC0.

Scroll sideways to compare the full chemistry names.

Cathode family	Contains lithium?	Uses cobalt in the cathode?
LCO · Lithium cobalt oxide	Yes	Yes
NMC · Lithium nickel manganese cobalt oxide	Yes	Yes; proportion varies
NCA · Lithium nickel cobalt aluminum oxide	Yes	Yes; proportion varies
LFP · Lithium iron phosphate	Yes	No

A chemistry change is a product change. Replacing a cell requires checking voltage limits, energy and power requirements, thermal behavior, charging controls, physical fit and validation requirements. A shared cylindrical format is not proof of interchangeability.

Cell chemistry also does not define the material of every terminal, busbar or housing. For assembly work, specify those joining materials separately; the battery laser welding page addresses that manufacturing step.

Neodymium enables compact permanent magnets

Neodymium is an ingredient in NdFeB magnet materials. Their strong magnetic performance allows compact magnetic assemblies in selected motors, generators, speakers and actuators. The working material is an alloy-based magnet, not pure neodymium. The DOE ARPA-E MAGNITO program describes the importance of the Nd₂Fe₁₄B magnet system.

Magnet selection still depends on the whole application. Grade, geometry, operating temperature, resistance to demagnetization and corrosion protection all matter. A stronger room-temperature rating alone does not establish that a magnet will work in a hotter motor.

Some motor designs use alternatives such as induction or switched reluctance rather than rare-earth permanent magnets. Choosing one changes the motor and control system; it is not a direct material swap. DOE’s motor overview explains these different architectures.

Illustrative comparison: two electric vehicles

An EV with an LFP battery and an NdFeB permanent-magnet traction motor can avoid cobalt in its cathode while still depending on neodymium in its motor. An EV with an NMC battery and an induction traction motor can have the opposite pattern in those two assemblies. Other vehicle components may add further dependencies.

This is an architecture example, not a measured bill of materials. It shows why “EV” alone cannot identify either cobalt or rare-earth content.

Where supply can become constrained

A shortage can occur at a different stage from the one a buyer is watching. Mining output, refined material output and qualified component capacity are separate measures.

1. Recover the materialMine it or recover it from another material’s processing stream. By-product recovery depends partly on the host industry.
2. Refine or separate itRemove unwanted elements and produce a suitable chemical or metal. Capacity must match the required specification.
3. Convert it into a usable formMake the target, powder, cathode material, semiconductor structure or magnet material required downstream.
4. Qualify the componentDemonstrate that the part meets the product’s electrical, optical, magnetic or reliability requirements.

For example, USGS reports that China accounted for 99% of worldwide primary low-purity gallium production in 2025. That statistic describes a specific upstream production stage. It is not a statement that China made 99% of all GaN devices, all high-purity gallium, or the gallium-containing parts in a particular product. Source: Mineral Commodity Summaries 2026, gallium.

Concentration also does not move uniformly across materials. The IEA’s 2026 outlook reports higher refining concentration for most key minerals in 2025, while rare earths were an exception with a modest decrease. A single percentage cannot describe all seven supply chains.

Check the second source beyond the invoice. Two component vendors may depend on the same refiner or converter. Ask which upstream stage is independent, whether the alternate part is already approved, and what capacity and lead time the supplier can actually commit.

Substitution and recycling solve different problems

Substitute the function, then validate the design

Substitution starts with the job the material performs. A power-switching design may be evaluated with another semiconductor technology; a battery may use another cathode; a motor may use another architecture. Each route can change performance, packaging, controls or manufacturing.

Set the acceptance criteria before comparing options: for example, conversion losses and thermal limits for a switching stage, usable energy and charging limits for a pack, or torque and temperature performance for a motor. If an alternative cannot meet the required criteria, a lower material exposure does not make it an acceptable replacement.

Separate manufacturing scrap from end-of-life recovery

Clean, segregated manufacturing scrap is different from a mixed discarded product. Used coating targets or known production residues can provide a more controlled feedstock than a shredded device containing many materials. USGS documents indium recovery from ITO scrap and recovery routes for other materials in its 2026 commodity chapters.

For a finished product, collection, disassembly, concentration, recovery yield and the quality of the recovered output all affect what can return to manufacturing. “Recyclable” does not by itself establish that a local process exists, that recovery is economical, or that the output meets a particular component specification.

Ask a recycling supplier to identify the input stream, recovered material, recovery basis and destination. A collection rate, process yield and recycled-content percentage answer different questions and should not be used interchangeably.

What to request before making a sourcing decision

Begin with the actual part or assembly, then work upstream. A useful supplier discussion should establish four things:

The dependency: the part number, material declaration or chemistry, and the function that requires it. An end-product label such as “smartphone” or “EV” is insufficient.
The required form: the grade, purity or impurity limits, dimensions and performance specification. Confirm whether the quoted material is a metal, compound, target, powder or finished component.
The approved supply route: manufacturing sites, relevant upstream processors, change-notification arrangements and the qualification status of alternatives. A seller’s address alone does not establish material origin.
The evidence for a change: representative samples, applicable test results, available capacity and agreed delivery terms. For recycled content, also request its calculation basis and traceability scope.

A certificate of analysis can support a batch’s composition or purity; it does not prove a finished component’s reliability. A material declaration can identify ingredients; it does not establish spare production capacity. Match each document to the decision it can actually support.

Sources and further reading

The production figure above is for 2025, published in the 2026 USGS summary. Device examples describe material roles, not a universal bill of materials.

USGS — Mineral Commodity Summaries 2026: gallium, germanium, indium, tantalum, lithium, cobalt and rare-earth chapters.
IEA — Global Critical Minerals Outlook 2026, executive summary: supply concentration and diversification.
DOE — Rare Earth Elements and RSC — Germanium: terminology and classification.
Infineon — GaN-on-silicon and GaN-on-silicon-carbide: device platform distinctions.
KYOCERA AVX — High-Reliability Solid Tantalum Capacitors: anode and dielectric construction.
DOE — Reducing Reliance on Cobalt and Australian Government — Electric vehicles and the environment: cathode differences.
DOE — Electric Motors Research and Development: motor architectures.

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