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hafnium    音标拼音: [h'æfniəm]
n. 铪

铪

hafnium
n 1: a grey tetravalent metallic element that resembles
zirconium chemically and is found in zirconium minerals;
used in filaments for its ready emission of electrons [synonym:
{hafnium}, {Hf}, {atomic number 72}]

hafnium \haf"ni*um\ (h[a^]f"n[=e]*[u^]m or h[aum]f"n[=e]*[u^]m),
n.
A metallic element of atomic number 72 present together with
zirconium to the extent of 1% to 5% in zirconium minerals. It
is a poisonous, ductile metal with a brilliant silver luster,
has an atomic weight of 178.49, and has a high melting point
(2227[deg] C). It is used in nuclear reactors, and
incandescent lamps as a scavenger of oxygen and nitrogen. See
also {norium}.
[1913 Webster]

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  • Hafnium - Wikipedia
    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 | Definition, Atomic Mass, Properties, Uses, Facts | Britannica
    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
  • The Hardworking Element Hafnium - ChemTalk
    In this article, you will learn several properties, applications, compounds, and current research on the element hafnium
  • Hafnium | History, Uses, Facts, Physical Chemical Characteristics
    Hafnium was discovered in 1923 as a novel metal by Hevesy and Coster In nature, it exists in combination with zirconium and its alloys have high refractory properties
  • Hafnium - Element information, properties and uses | Periodic Table
    Element Hafnium (Hf), Group 4, Atomic Number 72, d-block, Mass 178 486 Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images
  • Virginia Energy - Geology and Mineral Resources - Hafnium
    Hafnium is a lustrous metal with the chemical symbol Hf When exposed to air, it forms a durable oxide film which is highly resistant to corrosion Hafnium is almost always found together with the element zirconium (Zr) Hafnium is a ductile metal and as a fine powder is highly flammable
  • Isotopes of hafnium - Wikipedia
    All isotopes of hafnium are either radioactive or observationally stable, meaning that they are predicted to be radioactive but no actual decay has been observed
  • Hafnium: Element Properties and Uses - samaterials. com
    Hafnium is a lustrous, corrosion-resistant transition metal used in nuclear reactors, semiconductors, and superalloys Its high neutron absorption and thermal stability make it essential in advanced industrial and technological applications
  • Facts About Hafnium - Live Science
    Hafnium is a lustrous, silvery-gray transition metal Discovered in 1923, it was the next-to-last element with stable nuclei to be added to the periodic table (the final one was rhenium in 1925)
  • Hafnium Facts, Symbol, Discovery, Properties, Uses
    Hafnium (pronounced as HAF-nee-uhm) belongs to the family of transition metals, denoted by the chemical symbol Hf It has thirty-two isotopes with known half-lives, of which only six exist naturally [1, 2]





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