Hom phaj nyaj

Hafnium is a lustrous, silvery, ductile metal generally similar to zirconium. Good corrosion resistance and high strength. Nws resists corrosion vim muaj ib tawv tawv, impenetrable oxide zaj duab xis rau nws qhov chaw. The metal is unaffected by alkalis and acids, tsuas yog hydrofluoric acid. Hafnium yog nyuaj rau cais tsim zirconium, vim hais tias ob lub ntsiab muaj atoms uas yog ib qho loj. Hafnium thiab nws cov alloys siv rau tswj nuclear reactors nuclear thiab nuclear submarines vim hafnium yog excellent ntawm absorbing neutrons thiab nws muaj ib tug melting taw tes heev thiab yog corrosions resistant. Nws siv hauv qhov kub thiab txias thiab ceramics, Vim tej cov compounds no refractory heev: Lawv yuav tsis melt tsuas yog nyob rau hauv qhov kev kub tshaj plaws.

Hom phaj nyaj (tsis hnov lus: ib nrab, naj npawb: 72) Yog ib tug Block D, Haiv 4, caij nyoog 6 lub caij uas muaj ib qho atomic yuag 178.49. The number of electrons in each of Hafnium’s shells is 2, 8, 18, 32, 10, 2 and its electron configuration is [Xe] 4f14 5d2 6s2. The hafnium atom has a radius of 159 pm and a Van der Waals radius of 212 pm. Hafnium was predicted by Dmitri Mendeleev in 1869 but it was not until 1922 that it was first isolated Dirk Coster and George de Hevesy.

In its elemental form, hafnium has a lustrous silvery-gray appearance. Hafnium does not exist as a free element in nature. It is found in zirconium compounds such as zircon. Hafnium is often a component of superalloys and circuits used in semiconductor device fabrication. Its name is derived from the Latin word Hafnia, meaning Copenhagen, where it was discovered. Saum toj no yog rau cov lus qhia xwb. Eagle Alloys yuav tsis nyiam accuracy ntawm cov txheej txheem los yog cov ntaub ntawv. Tas ib sab drawings tej zaum yuav tau forwarded rau ib tog thib peb rau outsourcing.