Published
europium
vr.tr.europium · thing-q1396
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.
Thing Registry Physical world and living systems PHY.MAT
Bundle → Layer → Finding → QuestionsClassifiersWhat it isWhy it existsDistinguishing featuresWhat robots and AI may and may not doMoral aspectsOwnersLinks to other meta-modelsIdentity and identifiersDirect propertiesRecognitionCapabilities and actionsHazards and failure modesStandards and interfacesContext of useSources
Bundle → Layer → Finding → Questions Filled
4 bundles · 8 layers · 8 findings · 16 questions
Element What europium is.
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.
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.
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.
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
Classifiers Filled
- Family
- Thing Registry
- Category
- Physical world and living systems
- Entry kind
- thing
- Plane
- PHY
- Domain
- PHY.MAT
- Other names and narrower kinds
- europium-152, europium-161, europium-165, europium-166, europium-130, europium-131, europium-132, europium-133, europium-134, europium-135, europium-136, europium-136m
What it is Filled
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.
Why it exists Filled
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.
Distinguishing features Filled
- Most reactive rare earth
- Red and blue phosphor activator
- Divalent and trivalent chemistry
- Supply from rare earth processing
What robots and AI may and may not do Filled
Must not
- Advise storing europium in contact with air or water.
- Describe rare earth supply as ethically sourced without evidence.
- Disclose details of banknote security features that could aid counterfeiting.
- Present supply forecasts as certain.
Only with a human decision
- Any purchase, storage or disposal of europium.
May
- Explain europium's properties and uses, citing references.
- Relay safety data sheet guidance on its reactivity.
- Describe rare earth supply chains with sources and dates.
Moral aspects Filled
- Rare earth mining harms environments and communities.
- Security features protect money from counterfeiters.
Who is affected
- Mining communities
- Workers
- The public relying on secure banknotes
Owners Filled
Steward
The licensed holder of the material.
Links to other meta-models Filled
parent
- Q19569 - registry parent class
related
- lanthanide - the series
- phosphor - red and blue 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.europium
- Wikidata: Q1396 (https://www.wikidata.org/wiki/Q1396)
- chemical symbol: Eu
- CAS number: 7440-53-1
Direct properties required Filled
- 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
Recognition required Filled
- Element 63, lanthanide
- Red and blue luminescence in phosphors
- Samarium and gadolinium are neighbouring rare earths
- Silvery-white soft metal that oxidises quickly in air; compounds glow red or blue under ultraviolet light.
Capabilities and actions required Filled
- explain properties and isotopes
- explain uses and supply
- relay handling information
- distinguish from neighbouring rare earths
Hazards and failure modes required Filled
- Rapid oxidation and reactivity with water
- Supply disruption
- Environmental impact of rare earth mining
Standards and interfaces required Filled
- Critical raw material lists
- Chemical classification and labelling rules
- Trade controls on rare earths in some countries
Context of use required Filled
- Phosphors, security features, control rods and research.
- europium metal
- europium oxide and other compounds
- europium-doped phosphors
- europium isotopes
- europium in banknote security inks
Sources Filled
- Wikidata item Q1396: europium - identity and sense of the item
- Wikipedia: Europium - general description of the item
Open questions
- 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?
Machine files
Provenance
thing registry research (pass 2) · unreviewed
Built from: models/things/publications/thing-q1396/spec.json