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Encyclopedia Britannica



GERMANIUM

This article appears in Volume V11, Page 777 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: GEO-GNU
GERMANIUM (symbol Ge, atomic
weight
  72.5); one of the metallic elements included in the same natural family as carbon, silicon, tin and lead. It was discovered in 1886 by C. Winkler in
argyrodite
 , a
mineral
  found at Freiberg in Saxony. On examination of the metal and its salts it was shown to be identical with the hypothetical
element
  eka,silicon, whose properties had been predicted by D. Mendeleeff many years previously. The
element
  is of extremely rare occurrence, being met with only in
argyrodite
  and, to a very small extent, in euxenite. It may be obtained from argyrodite by
heating
  the
mineral
  in a current of hydrogen; or by
heating
  the dioxide to redness with carbon. _ It forms grey coloured octahedra of specific gravity 5'496 at 20 C., melting at 900 C.; it burns at a red heat, is insoluble in hydrochloric acid, but dissolves in aqua regia, and is also soluble in molten alkalis. Two oxides of germanium are known, the dioxide, GeO2, being obtained by roasting the sulphide and treatment with nitric acid. It is a
white
  powder, very slightly soluble in water, and possesses acid properties. By heating with a small quantity of magnesium it is converted into germanious
oxide
 , GeO. By heating the metal with chlorine, germanic chloride, GeC14j is obtained as a colourless fuming liquid boiling at 86-87 C., it is decomposed by water forming a hydrated germanium dioxide. Germanium dichloride, GeC12, and germanium chloroform, GeHCI3, have also been described.
Germanium compounds on fusion with alkaline carbonates and
sulphur
  form salts known as thiogermanates. If excess of a mineral acid be added to a solution of an alkaline thiogermanate a
white
  precipitate of germanium disulphide, GeS2, is obtained. It can also be obtained by passing sulphuretted hydrogen through a solution of the dioxide in hydrochloric acid. It is appreciably soluble in water, and also in solutions of the
caustic
  alkalis and alkaline sulphides. By heating the disulphide in a current of hydrogen, germanious sulphide, GeS, is formed. It sublimes in thin plates of a dark colour and metallic lustre, and is soluble in solutions of the
caustic
  alkalis. Alkyl compounds of germanium such as germanium tetra-ethyl, Ge(C2H5)4, a liquid boiling at 16o C., have been obtained. The germanium salts are most readily recognized by the white precipitate of the disulphide, formed in acid solutions, on passing sulphuretted hydrogen. The atomic
weight
  of the element was determined by C. Winkler by
analysis
  of the pure chloride GeC14, the value obtained being 7232, whilst Lecoq de Boisbaudran (Comptes rendus, 1886, 103, 452), by a comparison of the lines in the spark spectrum of the element, deduced the value 72.3.


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