Karl Baedeker (scientist)

Karl Wilhelm Baedeker Sali ( born February 3, 1877 in Leipzig, † August 5, 1914 near Liege ) was a German physicist and associate professor at the Friedrich -Schiller- University Jena. It assigns to the discovery of the doping of semiconductors.

Life

As the son of the publishing bookseller Fritz Baedeker born, he attended from 1886 to 1895 the humanist Thomas School in Leipzig.

After graduation, he studied chemistry, mathematics and physics at the University of Geneva, the Ruprecht -Karls- University of Heidelberg, Ludwig- Maximilians- University of Munich and at the Georg- August-Universität Göttingen. It was in 1900 Dr. phil in Göttingen during the later Nobel laureate Walther Nernst with the dissertation Experimental study on the dielectric constant of some gases and vapors in their dependence on the temperature. doctorate.

He then worked at Otto Wiener in Leipzig. He was an assistant to Wilhelm Wien at the Julius- Maximilians- University of Würzburg and at Walter King at the Ernst- Moritz- Arndt- University of Greifswald. In 1907 he qualified as a professor in physics at the University of Jena with a custom built with Theodor des Coudres at the University of Leipzig work. In 1910 he was appointed extraordinary professor in Jena for physics.

He fought as a lieutenant in the field artillery and brigade adjutant in the First World War. During the conquest of the city of Liège ( Battle of Fort Fléron RETINNE in 1914) he was only 37 years old.

Baedeker was married and had two children.

Science

His main areas of work were based on the physical chemistry questions of electrical conduction in metals and thermoelectricity. As early as 1907 he observed that the conductivity of copper iodide transparent layers ( insulators or semiconductors ) increases by orders of magnitude when additional iodine is introduced into the crystal by diffusion. He also reported on the good electrical conductivity of transparent (orange - yellow colored ) cadmium oxide layers and thus the first transparent conductive oxide layer. He observed at the CuI a positive, a negative on CdO Hall constant. Only later could be understood that CuI p-type and n-type CdO is.

Writings (selection )

• Experimental study on the dielectric constant of some gases and vapors, in its dependence on the temperature. W. Engelmann, Leipzig 1900. ( = At the same time Dissertation, University of Göttingen 1900)
• Of the electrical conductivity and the thermoelectric power of some heavy metal compounds. In: Annals of Physics 327 (1907) 4, 749-766. doi: 10.1002/andp.19073270409 ( = at the same time post-doctoral thesis, University of Jena 1907)
• Electrical phenomena in metallic conductors. F. Vieweg, Braunschweig, 1911.