RUSS LAPPA / SCIENCE PHOTO LIBRARY RUSS LAPPA / SCIENCE PHOTO LIBRARY
Hafnium, a silvery, lustrous transition metal which occurs with zirconium in the minerals zircon and baddeleyite. It is used in tungsten alloys for filaments and electrodes and as a neutron absorber in nuclear reactors. Hafnium was first reported by Urbain in 1911, but its existance was only fully established in 1923 by D. Coster and G. C. de Hevesey.
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