{"id":617,"date":"2018-12-03T16:50:47","date_gmt":"2018-12-03T16:50:47","guid":{"rendered":"http:\/\/periodic-table.com\/?p=617"},"modified":"2018-12-03T16:50:47","modified_gmt":"2018-12-03T16:50:47","slug":"germanium","status":"publish","type":"post","link":"https:\/\/periodic-table.com\/germanium\/","title":{"rendered":"Germanium"},"content":{"rendered":"

Germanium was discovered in 1886. Germanium belongs to the carbon family and used in electronic devices as semiconductors.<\/em><\/strong><\/p>\n

History and Discovery<\/strong><\/h3>\n

Dmitri Mendeleev predicted the existence of germanium in 1869. He named it eka-silicon and proposed some of the physical characteristics of the then unknown metal. Later, Clemens Winker discovered germanium from a rare mineral known as argyrodite, in 1886 [1]. He successfully prepared various compounds with chlorides, fluorides, and dioxide, and found that the physical characteristics of germanium were almost the same as were predicted by Mendeleev. Germanium became a significant element in 1945, when it was used semiconductor in electronic, mostly diodes. Its symbol is Ge. In 1948, germanium transistors were developed and opened new horizons in electronic industry. In 2000, around 80% of the world\u2019s germanium production was used in the manufacturing of optical fibers communication networks and laser infrared night vision systems. The element was named germanium <\/em>by Winkler that was derived from Germania <\/em>(Germany), his homeland.<\/p>\n

Germanium<\/h3><\/strong><\/h2>\n\n\n\n\n\t\n\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t
Periodic Table Classification<\/th>Group 14
\nPeriod 4<\/th>\n<\/tr>\n<\/thead>\n
State at 20C<\/td>Solid<\/td>\n<\/tr>\n
Color<\/td>Grayish-white<\/td>\n<\/tr>\n
Electron Configuration<\/td>[Ar] 3d10 4s2 4p2<\/td>\n<\/tr>\n
Electron Number<\/td>32<\/td>\n<\/tr>\n
Proton Number<\/td>32<\/td>\n<\/tr>\n
Electron Shell<\/td>2, 8, 18, 4
\n<\/td>\n<\/tr>\n
Density<\/td>5.32 g.cm-3 at 20\u00b0C<\/td>\n<\/tr>\n
Atomic number<\/td>32<\/td>\n<\/tr>\n
Atomic Mass<\/td>72.64 g.mol -1<\/td>\n<\/tr>\n
Electronegativity according to Pauling<\/td>2.01<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n

Occurrence<\/strong><\/h3>\n

Germanium is an abundant element and is ranked as the 15th<\/sup> most abundant element in the earth\u2019s crust. Germanium is not present in its pure elemental form and mostly extracted from its zinc ore (sphalerite) and from ores of copper, silver and lead. Extremely pure germanium crystals are obtained through a technique termed as zone refining which produces semiconductor grade germanium with an impurity of 1 in 1010<\/sup>. This germanium semiconductors are considered as one of the purest substance that are ever made. The largest producers of germanium in the world are China, USA and Russia.<\/p>\n

Physical Characteristics<\/strong><\/h3>\n

Germanium is a whitish grey lustrous metalloid (semi-metallic) [2]. It is hard and brittle in nature. \u00a0there are two allotropic forms of germanium, alpha and beta germanium. Alpha germanium is hard lustrous metal with a cubic crystal structure that resembles diamond. The beta germanium is silvery and soft metal [3].<\/p>\n

Chemical Characteristics<\/strong><\/h3>\n

Pure germanium reacts slowly with air at higher temperature, around 250\u00b0C and forms germanium oxide. It does not react with dilute acids but is easily dissolved in hot concentrated acids. Germanium reacts with halogens to form compounds like germanium tetrachloride and germanium tetraiodide. Germanium reacts with oxygen and form two oxides, germanium monoxide and germanium dioxide. It also reacts with sulfur, selenide and telluride to form disulfide GeS2, germanium diselenide GeSe2<\/sub> and germanium telluride (GeTe) [4].<\/p>\n

Significance and Uses<\/strong><\/h3>\n