Hafnium is a chemical element; it has symbol Hf and atomic number 72. A lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. Its existence was predicted by Dmitri Mendeleev in 1869, though it was not identified until 1922, by Dirk Coster and George de Hevesy.

Hafnium, chemical element, metal of Group 4 (IVb) of the periodic table. It is a ductile metal with a brilliant silvery luster. It is dispersed in Earth’s crust to the extent of three parts per million and is invariably found in zirconium minerals up to a few percent compared with zirconium.

Hafnium is also very good at forming super-alloys, which can withstand very high temperatures and has found applications in making a variety of parts for space vehicles. In terms of regular compounds rather than alloys, hafnium carbide has the highest melting point, of any compound consisting of just two elements, at just under ...

2023年12月28日 · What is Hafnium Used for. A good absorber of neutrons, Hf applies to making control rods of nuclear reactors such as those used in nuclear submarines [1, 2].; It is used as a reactive material known as a getter in vacuum tubes for removing traces of gases like oxygen and nitrogen and other unwanted contaminates [2, 10, 11].; It alloys with many metals, such as …

3 天之前 · Hafnium (symbol: Hf, atomic number: 72) is a transition metal that is similar in many ways to zirconium.You probably do not encounter this element much, aside from its occurrence in some gemstones and integrated circuits. Despite its relative obscurity, hafnium plays a crucial role in various industrial and scientific applications.

Hafnium tetrachloride is a precursor in the production of pure hafnium. Its reaction with halogens is highly exothermic and can be vigorous. Hafnium is resistant to attack by diluted acids and alkalis, but it can dissolve in concentrated sulfuric acid, forming sulfate and releasing hydrogen:

Hafnium is a good absorber of neutrons and is used in the control rods of nuclear reactors. Hafnium is also used in vacuum tubes as a getter, a material that combines with and removes trace gases from vacuum tubes. Hafnium has been used as an alloying agent in iron, titanium, niobium and other metals.

Hafnium | Hf | CID 23986 - structure, chemical names, physical and chemical properties, classification, patents, literature, biological activities, safety/hazards ...

6 天之前 · Hafnium is a metallic element with the chemical symbol Hf and atomic number 72. It is extracted from zirconium minerals, as it is commonly found in zirconium ores due to its similar chemical properties. Unlike lawrencium, hafnium exists naturally and is notable for its high melting point and strength at high temperatures, making it valuable in ...

Hafnium oxide-based compounds are being introduced into silicon-based chips to produce smaller, more energy efficient and performance packed processors. Most of the hafnium produced is used in the production of control rods for nuclear reactors.