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Germanium is sot metallic of silvery shade. It's a component of the fourth group of periodic system, the place it is designated as Ge. It pertains to hint components. Its atomic weight is 72.59 and particular weight is 5.33 g/cm3. It was invented in 1886 by German scientist. Its title derived from a name of his motherland — Germany. It cannot be met in a pure state. It will possibly only be met as an additive in nickel-tungsten mines, sedimentary rocks, carbone, silicates, turf, thermal water. It may also be saved in algaes.

Technical characteristics
Germanium is relatively brittle steel. It is not uncovered to chilly or scorching strain working as much as a temperature of 550 °C. Surface movie makes it pretty resistant to effect of air, water, salt acid in standard conditions. It weakly reacts with caustic sodas however could be simply dissolved with chloronitrous acid or alkali resolution of hydrogen superoxide. Chemical valency is +2 +four. Chemical compounds with excessive valence are extra stable. Essentially the most ceaselessly is used dioxide GeO2. .

Physical properties of Ge
Manufacture

Germanium is obtained by non-ferrous ore processing and out of coal ash. Germanium content is outlined with a assist of emission spectrum evaluation, the place it's discovered by forming of germanium-molybdenum vivid-yellow acid. It's smelted by metallurgic technique at a temperature of 800−1800°C. To obtain engineering preis tantal , it should be purified in quartz columns with a help of salt acid by thermal diffusion methodology that is meant to do crystallization. Manufacture of single-crystalline germanium used in semi-conducting devices specifies by GOST 16 153−80 and technical situations.

Utility
This metal relates to semi-conductors which might be used as excessive-frequency single-crystallines for manufacture of transistors, photoconductive resistors, photodiodes, and diodes. There are made Hall units, resistant thermometers, lenses of X-ray spectrum evaluation. High-tensile germanium spatter is utilized in jewellery and dentoprosthetic technique. Some alloys on its foundation are meant to be utilized in anticorrosion coverings. Additives of GeO2 dioxide are utilized in alloys, steel mill-merchandise — wire, bar, sheets.

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