Sibylle Kemmler-Sack (18 November 1934 in

Leipzig Leipzig (, ; ; Upper Saxon: ; ) is the most populous city in the States of Germany, German state of Saxony. The city has a population of 628,718 inhabitants as of 2023. It is the List of cities in Germany by population, eighth-largest city in Ge ...

– 10 February 1999) was a German chemist. She was a professor for

Chemistry Chemistry is the scientific study of the properties and behavior of matter. It is a physical science within the natural sciences that studies the chemical elements that make up matter and chemical compound, compounds made of atoms, molecules a ...

at the

University of Tübingen The University of Tübingen, officially the Eberhard Karl University of Tübingen (; ), is a public research university located in the city of Tübingen, Baden-Württemberg, Germany. The University of Tübingen is one of eleven German Excellenc ...

Life

Kemmler-Sack did her doctorate on "Untersuchungen an ternären Uran (V)oxiden" (Investigations on ternary

uranium Uranium is a chemical element; it has chemical symbol, symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Ura ...

(V)oxides) in 1962. She habilitated in 1968 and the title of her habilitation thesis was "Über spektroskopische und magnetische Untersuchungen an Oxidfluoriden es fünfwertien Urans" (About

spectroscopic Spectroscopy is the field of study that measures and interprets electromagnetic spectra. In narrower contexts, spectroscopy is the precise study of color as generalized from visible light to all bands of the electromagnetic spectrum. Spectrosc ...

and magnetic investigations on oxide fluorides it five-valent uranium). She became a university lecturer in 1968, an extraordinary professor in 1973, a university professor in 1978.

Research

One focus of her work was the synthesis and characterization of

perovskite Perovskite (pronunciation: ) is a calcium titanium oxide mineral composed of calcium titanate (chemical formula ). Its name is also applied to the class of compounds which have the same type of crystal structure as , known as the perovskite (stru ...

phases. She investigated their

luminescence Luminescence is a spontaneous emission of radiation from an electronically or vibrationally excited species not in thermal equilibrium with its environment. A luminescent object emits ''cold light'' in contrast to incandescence, where an obje ...

and their conductivity in a systematic manner. In the 1990s, she also synthesized

bismuth Bismuth is a chemical element; it has symbol Bi and atomic number 83. It is a post-transition metal and one of the pnictogens, with chemical properties resembling its lighter group 15 siblings arsenic and antimony. Elemental bismuth occurs nat ...

and bismuth /lead

superconducting Superconductivity is a set of physical properties observed in superconductors: materials where electrical resistance vanishes and magnetic fields are expelled from the material. Unlike an ordinary metallic conductor, whose resistance decreases g ...

cuprate Cuprates are a class of compounds that contain copper (Cu) atom(s) in an anion. They can be broadly categorized into two main types: 1. Inorganic cuprates: These compounds have a general formula of . Some of them are non-stoichiometric. Many ...

s and investigated how the conductivity changed when Cu²⁺ is gradually replaced by other transition metal ions.

References

{{DEFAULTSORT:Kemmler-Sack, Sibylle 20th-century German chemists German women chemists Academic staff of the University of Tübingen 20th-century German women scientists 1934 births 1999 deaths