NMR properties:

Magnetogyric Ratio NMR frequency Natural abundance (NA) Nuclear spin (I) Quadrupole moment (Q) Reference sample
73 Ge -0.93603110^7 rad/sT 3.48832MHz 7.76% 9.5 -19.6fm²

Me4Ge +5% C6D6

73 Ge
32

(Latin Germania, Germany) Mendeleev predicted the existence of Germanium in 1871 as ekasilicon, and
the element was discovered by Winkler in 1886.
Sources
The metal is found in
l argyrodite, a sulfide of germanium and silver ;
l germanite, which contains 8 percent of the element;
l zinc ores;
l coal; and
l other minerals.
The element is commercially obtained from the dusts of smelters processing zinc ores, as well as
recovered from combustion by-products of certain coals. A large reserve of the elements for future uses
in insured in coal sources.
Germanium can be separated from other metals by fractional distillation of its volatile tetrachloride. The
techniques permit the production of germanium of ultra-high purity.
Properties

The element is a gray-white metalloid. In its pure state, the element is crystalline and brittle, retaining its
luster in air at room temperature. It is a very important semiconductor material. Zone-refining techniques
have led to production of crystalline germanium for semiconductor use with an impurity of only one part
in 10 10.
Uses
When germanium is doped with arsenic , gallium , or other elements, it is used as a transistor element in
thousands of electronic applications. The most common use of germanium is as a semiconductor.
Germanium is also finding many other applications including use as an alloying agent, as a phosphor in
fluorescent lamps, and as a catalyst.
Germanium and germanium oxide are transparent to the infrared and are used in infrared spectroscopes
and other optical equipment, including extremely sensitive infrared detectors.
The high index of refraction and dispersion properties of its oxide's have made germanium useful as a
component of wide-angle camera lenses and microscope objectives.
The field of organogermanium chemistry is becoming increasingly important. Certain germanium
compounds have a low mammalian toxicity, but a marked activity against certain bacteria, which makes
them useful as chemotherapeutic agents.