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Ge
Germanium


Atomic no.:
32
Atom. weight: 72.59
Density: 5.32
Class:
semi metal
Melting point: 937.4°C
Boiling point: 2830°C
Colour: grey shiny
   
Discoverer: C.A. Winkler
Place: Freiberg, Germany
Year: 1886

Discovered in 1886 by C.A. Winkler at Freiberg, Germany. Germanium is a silvery white brittle metalloid member of the carbon group of elements, its physical properties being similar to those of silicon, the element which precedes it in the group. Other elements within the carbon group are relatively common, but germanium is found only in trace amounts in some coals and as a minor component in some ores, the principle one being argyrodite, a double sulfide of silver and germanium (the mineral from which germanium was first isolated). It has an abundance within the Earth's crust of 1.8 ppm and the element is produced by reduction of the oxide, ultra-high purity material being obtained by zone refining (a process in which the element is formed into a rod which is then heated at one end to produce a narrow molten zone. The heater is moved along the length of the rod so that the molten zone travels from one end of the rod to the other. Impurities are more soluble in the molten metal than in the solid and thus concentrate in the liquid zone as it moves to one end of the rod). Germanium is stable in air and water and is unaffected by alkalis and acids, with the exception of nitric acid. It is a poor conductor of electricity but has exceptional properties as a semiconductor material and it is in this area where germanium is primarily used. However, other applications for the material include its use as an alloying element in the production of specific alloys and as an addition to glass in the manufacture of infrared devices.

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 Germanium - precision density-standard cube 1cm3  Art. Nr. 003861  
Germanium - precision density-standard cube 1cm3
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Germanium - monocrystalline 99.999% - Precision density-standard cube 1cm3 NEW! Shiny polished, laser engraved

Using finest materials, each density cube was lapped to 10.0x10.0x10.0mm by a mechanical engineering company with an accuracy of 0.01 millimeter. Each one separately ground and mirror polished it represents the theoretical density of the respective element by its weight. The weight is not affected by the laser inscription. Information such as element symbol, name and density is durable burned at the surface. Each element even shows its specific characteristis in colour and reaction with the laser. Altogether 25 elements are planned in a complete set in a wooden case.

Amount: 1 St. / 1 pc..
Purity : 99,999%
Packing: PE - bag
120.00
- tax free

Availability: 4 in stock

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