germanium
Let an agent identify germanium and its properties, relay production, uses, isotopes and history from reference sources, relay safety information, and distinguish it from silicon and other metalloids.
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 identify germanium and its properties, relay production, uses, isotopes and history from reference sources, relay safety information, and distinguish it from silicon and other metalloids.
A chemical element with symbol Ge and atomic number 32, a hard, brittle, greyish-white metalloid in the carbon group, a semiconductor with a diamond-like crystal structure; germanium was the material of the first transistors, is now used mainly in fibre optics, infrared optics, solar cells and polymerisation catalysts, is recovered as a by-product of zinc and coal processing, and has five stable isotopes.
What it is for: Fibre optics, infrared optics, semiconductors and catalysts.
It can be relay properties and isotopes; explain production and uses; relay history and safety; distinguish from related elements.
Distinguishing features
Metalloid semiconductor
First transistor material
By-product of zinc
Infrared transparency
What it looks like
A lustrous, hard, greyish-white brittle solid with a metallic sheen.
Physical character
atomic number: 32 Z
standard atomic weight: 72.63 u
melting point: 938.3 degrees C
band gap: 0.67 eV - at room temperature
How it is recognised
Element 32, symbol Ge
Metalloid semiconductor in the carbon group
Silicon and tin are the neighbouring group members
Related models
is a kind of - in registry terms
is a kind of - in the carbon group
is adjacent to - element 31
is adjacent to - element 33
In practice
Families and kinds
germanium metal and crystals
germanium compounds such as the dioxide and tetrachloride
isotopes from germanium-58 to germanium-89, with five stable isotopes
silicon-germanium alloys
Identifiers
symbol Ge
CAS 7440-56-4
Standards and regulation
Chemical safety data sheets
Critical raw material listings in the EU and elsewhere
Export controls in some producing countries
Failure modes and hazards
Toxicity of some compounds such as germane gas
Supply concentration and export restrictions
Confusion with silicon in device contexts
Also called
+6
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Identify What germanium is.
Identity.
Properties
Properties.
Properties
Properties.
- What are the physical, chemical and semiconductor properties of germanium? definition
- Is the question about germanium or a related element such as silicon? boundary
Isotopes
Isotopes.
Isotopes
Isotopes.
- Which isotopes exist, and which are stable or useful, such as in neutrino research? definition
- Which entry fits the specific isotope? action
Industry Production and uses.
Supply.
Production
Production.
Production
Production.
- How is germanium recovered and refined, and who produces it, with sources? provenance
- Which sources are cited? provenance
Uses
Uses.
Uses
Uses.
- How is germanium used in fibre optics, infrared optics, electronics and catalysts? provenance
- Which entry fits a specific application? action
Safety Safety and supply.
Regulation.
Hazards
Hazards.
Hazards
Hazards.
- What hazards do germanium and its compounds present? provenance
- Is the user asking about a personal exposure, which needs a clinician or poison centre? boundary
Supply
Critical material status.
Supply
Supply.
- Why is germanium listed as a critical material, and what export controls apply? provenance
- Is the information current? boundary
Context History.
Context.
Discovery
Discovery.
Discovery
Discovery.
- How was germanium predicted by Mendeleev and discovered by Winkler in 1886? provenance
- Which references are standard? provenance
Electronics
Role in electronics history.
Electronics
Electronics.
- What role did germanium play in the first transistors, and why was it replaced by silicon? provenance
- Which entry fits the history of the transistor? action
What the second pass must settle
- Should isotopes be separate entries?
- How should reference data be linked?
- The registry entry has merged aliases naming isotopes; should they be split off?