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Germanium (Ge)
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Germanium 32Ge72.61
1886 von C.A. Winkler in Freiberg, Deutschland, entdeckt.
[Lateinisch, Germania= Deutschland]
French: germanium
English: germanium
Italian: germanio
Spanish: germanio
Beschreibung: Hochrein ist es ein silberweißes, sprödes, halbmetallisches Element. In Luft und Wasser ist es beständig, von Säuren (außer Salpetersäure) und Alkalien wird es nicht angegriffen. Verwendet in Halbleitern, Legierungen und Spezialgläsern für Infrarotgeräte.
Further Materials properties
| Crystal structure: |
(cell dimensions/pm), space group, |
|---|---|
| X-ray diffractions mass absorption coefficients: | CuKa 75.6 (µ/r) / cm2g-1 MoKa 64.8 (µ/r) / cm2g-1 |
| Neutron scattering length: | 0.8193 b/10-12 cm |
| Thermal neutron capture cross-section: | 2.2 sa / barns |
| Density: | 5323 kg/m-3 [293 K]; 5490 [liquid at m.p.] |
| Melting point: | 937.45°C / 1210.6°K |
| Boiling point: | 2829.85°C / 3103°K |
| Molar volume: | 13.64 cm3 |
| Thermal conductivity: | 59.9 [300 K] W m-1K-1 |
| Coefficient of linear thermal expansion: | 5.57 x 10-6 K-1 |
| Electrical resistivity: | 0.46 [295 K] Ωm |
| Mass magnetic susceptibility: | -1.328 x 10-9(s) kg-1m3 |
| Young's modulus: | 79.9 GPa |
| Rigidity modulus: | 29.6 GPa |
| Bulk modulus: | n.a. |
| Poisson's ratio: | 0.32 GPa |
| Radi: | Ge2+ 90; Ge4- 272; atomic 123; covalent 122 |
| Electronegativity: | 2.01 (Pauling); 2.02 (Allred); 4.6 eV (absolute) |
| Effective nuclear charge: | 5.65 (Slater); 6.78 (Clementi); 7.92 (Froese-Fischer) |
| Number of Isotopes (incl. nuclear isomers): | 24 |
| Isotope mass range: | 64-> 83 |
Biological data
| Biological role: | None, but germanium acts to stimulate metabolism. |
|---|---|
| Toxicity | |
| Toxic intake: | Germanium salts gernerally have low toxicity |
| Lethal intake: | LD50 (various, ingestion, rats etc.) = 500 - 5000 mg Kg-1 |
| Hazards: | The fumes of GeCl, liquid can irritate the eyes and lungs |
| Level in humans | |
| Blood: | c 0.44 ppm |
| Bone: | n.a. |
| Liver: | 0.15 ppm |
| Muscle: | 0.14 ppm |
| Daily dietary intake: | 0.4 - 1.5 mg |
| Total mass of element in average [70 kg] person: |
5 mg |
Geological data
| Minerals: | ||||
|---|---|---|---|---|
| Mineral | Formula | Density | Hardness | Crystal apperance |
| Germanite | Cu26Fe4Ge2S32 | 4.46 | 4 | cub, met. pale greyish-pink |
| Chief ores: | not mined as such: widely distributed in other minerals and Ge is recovered as a by-product of zinc and copper refining |
|---|---|
| World production: | 80 tonnes/year |
| Main mining areas: | see copper and zinc. |
| Reserves: | n. a. |
| Specimen: | available as chips, pieces or powder. Safe. |
| Abundances | |
|---|---|
| Sun: | 3160 (relative to H = 1 x 1012) |
| Earth's crust: | 1.8 ppm |
| Seawater | |
| Atlantic surface: | 0.07 x 10-6 ppm |
| Atlantic deep: | 0.14 x 10-6 ppm |
| Pacific surface: | 0.35 x 10-6 ppm |
| Pacific deep: | 7.00 x 10-6 ppm |
| Residence time: | 20 000 years |
| Classification: | recycled |
| Oxidation state: | IV |
Source: Emsley, J. (1998) The Elements (3rd Edition)
Other sizes and specifications on request
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