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.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
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.
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.
What it is for: Phosphors, magnetostrictive alloys, magnets and electronics.
It can be explain properties and isotopes; explain uses and supply; relay handling information; distinguish it from neighbouring rare earths.
Distinguishing features
Heavy rare earth element
Green luminescence
Magnetostrictive properties in alloys
Supply concentrated in a few countries
What it looks like
Silvery-white, malleable metal that oxidises slowly in air.
Physical character
atomic number: 65
melting point: about 1356 degrees C
density: about 8.2 g per cubic centimetre
stable isotopes: 1 isotope - terbium-159
How it is recognised
Element 65, lanthanide
Green emission in phosphors
Dysprosium and gadolinium are neighbouring rare earths
Related models
is a kind of - the series
is used in - green emitters
is obtained from - monazite and bastnasite
is related to - supply policy
In practice
Families and kinds
terbium metal
terbium oxide and other compounds
terbium-doped phosphors
Terfenol-D magnetostrictive alloy
terbium isotopes, mostly radioactive
Identifiers
chemical symbol Tb
CAS number 7440-27-9
Standards and regulation
Critical raw material lists
Chemical classification and labelling rules
Trade and export controls on rare earths in some countries
Failure modes and hazards
Supply disruption and price volatility
Environmental impact of rare earth mining and processing
Confusion among rare earths in analysis
Also called
+25
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.terbium
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Element What terbium is.
Chemistry.
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.
Uses.
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.
Safety.
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.
Context.
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
What the second pass must settle
- Should terbium compounds be separate entries?
- How should supply data be linked?
- The registry entry has merged isotope aliases; should they be split off?