terbium
Let an agent explain terbium as an element and material, relay its properties, uses, supply and handling information from reference and regulatory sources, and separate it from other rare earths and from its compounds.
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Element What terbium is.
Properties
Properties.
Properties
Properties.
- What are the physical, chemical and nuclear properties of terbium? definition
- Is the question about the element, a compound or another rare earth? boundary
Production
Ores and separation.
Production
Production.
- From which ores is terbium obtained, and how is it separated from other rare earths? provenance
- Which entry fits rare earth processing? action
Use Applications.
Applications
Uses.
Applications
Applications.
- How is terbium used in phosphors, magnets, alloys and electronics? provenance
- Which entry fits neodymium magnets? action
Supply
Supply.
Supply
Supply.
- What are production volumes, producers and criticality assessments, with sources? measurement
- Which sources and years are cited? provenance
Safety Handling.
Handling
Handling.
Handling
Handling.
- What handling rules apply to terbium and its compounds? provenance
- Is the question about a specific workplace, which needs its safety officer? boundary
Environment
Environmental issues.
Environment
Environment.
- What environmental issues arise from rare earth mining, with debates attributed? provenance
- Is the presentation neutral? boundary
Context History and research.
History
Discovery.
History
History.
- How was terbium discovered and named? provenance
- Which references are standard? provenance
Research
Research.
Research
Research.
- What research involves terbium, such as recycling and new phosphors? provenance
- Which entry fits rare earth recycling? action
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.MAT
- Other names and narrower kinds
- terbium-135, terbium-136, terbium-137, terbium-138, terbium-139, terbium-140, terbium-141, terbium-141m, terbium-142, terbium-142m1, terbium-142m2, terbium-143
What it is Filled
A silvery-white rare earth metal, chemical element 65, a lanthanide obtained from monazite, bastnasite and ion-adsorption clays; used in green phosphors for displays and lighting, in magnetostrictive alloys, in solid-state devices and as an additive in neodymium magnets to improve high-temperature performance.
Why it exists Filled
Let an agent explain terbium as an element and material, relay its properties, uses, supply and handling information from reference and regulatory sources, and separate it from other rare earths and from its compounds.
Distinguishing features Filled
- Heavy rare earth element
- Green luminescence
- Magnetostrictive properties in alloys
- Supply concentrated in a few countries
What robots and AI may and may not do Filled
Must not
- Misstate the origin of terbium to hide its supply chain.
- Confuse terbium with other rare earths, such as ytterbium or erbium, in records.
- Dispose of rare earth processing residues outside the permits that apply.
- Present rare earth supply as secure or risk-free without evidence.
Only with a human decision
- Committing to sourcing that depends on a single supplier country.
May
- Report terbium's properties, sources and uses from authoritative sources.
- Track terbium content in supply chains for magnets and phosphors.
Moral aspects Filled
- Rare earth mining and processing leave toxic and sometimes radioactive waste.
- Supply concentration makes terbium a tool of trade pressure.
Who is affected
- Communities near mines and refineries
- Workers in processing
- Manufacturers
Owners Filled
Steward
The person or business that holds it; mining rights are granted by the state.
Links to other meta-models Filled
parent
- Q19569 - registry parent class
related
- lanthanide - the series
- phosphor - green emitters
- rare earth ore - monazite and bastnasite
- critical raw material - supply policy
What else AI and robots need to interact with it Filled
Identity and identifiers required Filled
- Vercy registry: vr.tr.terbium
- Wikidata: Q1838 (https://www.wikidata.org/wiki/Q1838)
- chemical symbol: Tb
- CAS number: 7440-27-9
Direct properties required Filled
- atomic number: 65
- melting point: about 1356 degrees C
- density: about 8.2 g per cubic centimetre
- stable isotopes: 1 isotope - terbium-159
Recognition required Filled
- Element 65, lanthanide
- Green emission in phosphors
- Dysprosium and gadolinium are neighbouring rare earths
- Silvery-white, malleable metal that oxidises slowly in air.
Capabilities and actions required Filled
- explain properties and isotopes
- explain uses and supply
- relay handling information
- distinguish it from neighbouring rare earths
Hazards and failure modes required Filled
- Supply disruption and price volatility
- Environmental impact of rare earth mining and processing
- Confusion among rare earths in analysis
Standards and interfaces required Filled
- Critical raw material lists
- Chemical classification and labelling rules
- Trade and export controls on rare earths in some countries
Context of use required Filled
- Phosphors, magnetostrictive alloys, magnets and electronics.
- terbium metal
- terbium oxide and other compounds
- terbium-doped phosphors
- Terfenol-D magnetostrictive alloy
- terbium isotopes, mostly radioactive
Sources Filled
- Wikidata item Q1838: terbium - identity and sense of the item
- Wikipedia: Terbium - general description of the item
Open questions
- Should terbium compounds be separate entries?
- How should supply data be linked?
- The registry entry has merged isotope aliases; should they be split off?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q1838/spec.json