europium
Let an agent explain europium as an element and material, relay its properties, uses, supply and handling information from reference 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 europium as an element and material, relay its properties, uses, supply and handling information from reference sources, and separate it from other rare earths and from its compounds.
A soft silvery rare earth metal, chemical element 63 and a lanthanide, the most reactive of the rare earths, obtained from monazite and bastnasite; used in red and blue phosphors for displays, lighting and banknote security features, in nuclear control rods and in medical imaging agents.
What it is for: Phosphors, security features, control rods and research.
It can be explain properties and isotopes; explain uses and supply; relay handling information; distinguish from neighbouring rare earths.
Distinguishing features
Most reactive rare earth
Red and blue phosphor activator
Divalent and trivalent chemistry
Supply from rare earth processing
What it looks like
Silvery-white soft metal that oxidises quickly in air; compounds glow red or blue under ultraviolet light.
Physical character
atomic number: 63
melting point: about 826 degrees C
density: about 5.2 g per cubic centimetre - lowest of the lanthanides
stable isotopes: europium-151 and europium-153 isotopes - europium-151 is very weakly radioactive
How it is recognised
Element 63, lanthanide
Red and blue luminescence in phosphors
Samarium and gadolinium are neighbouring rare earths
Related models
is a kind of - the series
is used in - red and blue emitters
is obtained from - monazite and bastnasite
is related to - supply policy
In practice
Families and kinds
europium metal
europium oxide and other compounds
europium-doped phosphors
europium isotopes
europium in banknote security inks
Identifiers
chemical symbol Eu
CAS number 7440-53-1
Standards and regulation
Critical raw material lists
Chemical classification and labelling rules
Trade controls on rare earths in some countries
Failure modes and hazards
Rapid oxidation and reactivity with water
Supply disruption
Environmental impact of rare earth mining
Also called
+16
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.europium
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 europium is.
Chemistry.
Properties
Properties.
Properties
Properties.
- What are the physical, chemical and nuclear properties of europium? definition
- Is the question about the element, a compound or another rare earth? boundary
Production
Ores and separation.
Production
Production.
- From which ores is europium obtained, and how is it separated? provenance
- Which entry fits rare earth processing? action
Use Applications.
Uses.
Phosphors
Phosphors and security.
Phosphors
Phosphors.
- How is europium used in displays, lighting and banknote security features? provenance
- Which entry fits phosphors? action
Other
Nuclear and medical uses.
Other
Other.
- How is europium used in control rods and imaging agents, in general terms? provenance
- Which references are standard? provenance
Safety Handling and supply.
Safety.
Handling
Handling.
Handling
Handling.
- What handling rules apply to europium metal and compounds? provenance
- Is the question about a specific workplace, which needs its safety officer? boundary
Supply
Supply.
Supply
Supply.
- What are production volumes, producers and criticality assessments, with sources? measurement
- Which sources and years are cited? provenance
Context History and research.
Context.
History
Discovery.
History
History.
- How was europium discovered and named? provenance
- Which entry fits the discoverer? action
Research
Research.
Research
Research.
- What research involves europium, such as luminescent probes? provenance
- Which entry fits luminescent materials? action
What the second pass must settle
- Should europium phosphors be a separate entry?
- How should supply data be linked?
- The registry entry has merged isotope aliases; should they be split off?