Coster, Dirk

George de Hevesy (1885-1966 Nobel Prize for chemistry 1943) and Dirk Coster (1889-1950). The search for this element was long, and it was eventually found as a companion of zirconium minerals by means of X-ray spectroscopy. 

Hafnium (Hf, [Xe]4/ l45 /26.r), name and symbol from the Latin name of Copenhagen (Hafnia). Discovered (1923) in Copenhagen by Dirk Coster (Danish) and Georg Karl von Hevesy (Hungarian). 

In 1923 Georg Karl von Hevesy (1885—1966) and Dirk Coster (1889—1950), on the advice of Danish physicist Niels Henrik Bohr (1885—1962), used X-ray spectroscopy to study the pattern of electrons in the outer shell of zirconium. Their analysis led to the discovery... 

Hafnium Hf 1923 (Copenhagen, Denmark) Dirk Coster (Dutch) and Karl von Hevesy (Hungarian-Swedish) 147... 

Dutch physicist Dirk Coster and Hungarian physicist Georg Karl von Hevesy Shiny metal resistant to corrosion and chemically similar to zirconium used chiefly to absorb thermal neutrons in nuclear reactors. 

Georg von Hevesy. Hungarian chemist who, with Dr. Dirk Coster of the University of Groningen, discovered the element hafnium in zirconium ores and made a thorough study of its properties. Author of many papers on chemical analysis by X-rays, radioactivity, the rare earths, and electrolytic conduction. In 1943 he was awarded the Nobel Prize in Chemistry and in 1959 he received the Atoms for Peace Award. 

Dirk Coster. Professor of physics and meteorology at the Royal University of Groningen. Co-discoverer with Georg von Hevesy of the element hafnium. Author of many papers on X-rays and atomic structure. 

Birth of Georg von Hevesy in Budapest. Co-discoverer with Dirk Coster of the element hafnium. 

Hafnium Hf 72 Dirk Coster,G.von Hevesy Denmark Latin name "Hafnia" meaning "Copenhagen"... 

Hafnium was discovered in 1923 by Danish chemist Dirk Coster working together with Hungarian physicist Gyorgy K. Hevesy. The electronic structure of hafnium had been predicted by Niels Bohr, and Coster and Hevesy found evidence of a substance whose pattern matched what had been predicted. The element predicted by Bohr was finally identified as being part of the mineral zircon by means of x-ray spectroscopy analysis. Due to its discovery in Copenhagen (whose ancient Latin name was Hafnia), the element was named hafnium. 

In 1923 Dutch physicist Dirk Coster (1889—1950) and Hungarian chemist George Charles de Hevesy (1889—1966) found element 72 by X-ray analysis. The element was present in a piece of Norwegian zircon. Zircon also contains the mineral zirconium. 

Dutch physicist Dirk Coster and Hungarian chemist George Charles de Hevesy rediscover hafnium and are generally recognized as discoverers of the element. 

Hafnium (element 72) was discovered in 1923 by George Karl von Hevesy (1885-1966), a Hungarian, and Dirk Coster (1889-1950), from Holland, at the Institute of Theoretical Physics in Copenhagen ( Hafiiia in Latin), directed by Niels Bohr. The most widely held view of hafnium s... 

The discovery of the element hafnium provides a further example of a missed opportunity to turn scientific achievement into practical application. Hafnium was discovered at Niels Bohr s institute in Copenhagen in 1923 and quickly turned out to be fairly abundant and of potential industrial interest. However, no Danish chemical company seems to have taken an interest in the discovery. The two discoverers, Hevesy and Dirk Coster, sold the patent rights to the Philips firm in the Netherlands. Philips at once took out several patents on the use of hafnium compounds and developed methods for applying the metal in electrodes, filaments and fireproof enamels. ... 

Dirk Coster was born in Amsterdam in 1889. He studied at the technological university of Delft and took his doctor s degree at the university of Leyden. In 1922/23 he worked at Bohr s institute in Copenhagen. Returning to the Netherlands, he worked with Lorentz in the Teyler Laboratory in Haarlem. In 1924, he became professor of physics at the university of Groningen, where he continued to be active mainly in X-ray spectroscopy. He died in 1950 in Groningen. 

And to Dirk Coster The question is apparently rather clear but one must of course always be prepared for complications. These may arise from the circumstance that we have to do with a simultaneous development of two inner electron rings. ... 

Hafnium 1923 Dirk Coster (the Netherlands) and Georg von Tevesy (Hungary)... 

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