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.

1923年，瑞典化学家 赫维西 和荷兰物理学家D·科斯特在挪威和 格陵兰 所产的锆石中发现铪元素，并命名为hafnium，它来源于哥本哈根城的拉丁名称Hafnia。 1925年，赫维西和科斯特用含氟络盐分级结晶的方法分离掉 锆 、 钛，得到纯的铪盐；并用金属钠还原铪盐，得到纯的金属铪。 [1] 赫维西制得了几毫克纯铪的样品。 [2] 1998年 德克萨斯州大学 的Carl Collins教授做的一次实验中声称经伽玛射线照射的铪-178m2（同质异能素 铪-178m2 [3]）可以释放巨大的能量，其能量 …

铪 hā （英語： Hafnium），是一種 化學元素，其 化學符號 为 Hf， 原子序數 为72， 原子量 為 178.486 u。 铪为ⅣB族元素，是带光泽的银灰色的 过渡金属， 熔点 2233 °C， 沸点 4602 °C， 密度 13.31克/立方厘米。 致密的金属铪性质不活泼，表面形成常温稳定的 氧化物 覆盖层，但粉末状的铪容易在空气中自燃。 铪吸收氢气的能力很强，最高可形成HfH₂.₁。 高温下，铪能与氮发生反应。 由于 镧系收缩 的影响，铪的原子半径几乎和锆相等，因此二者性质极为相似，很难分离， …

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 a greyish-silver lustrous metal. It is a transition metal and resembles zirconium in its chemical properties, as both have equal number of valence electrons. It is ductile and is resistant to corrosion. Hafnium is denser than zirconium. Hafnium is resistant to …

Hafnium is a lustrous, silvery, ductile metal. Chemically it is similar to zirconium. When present in compounds, hafnium exists mostly in the oxidation state IV. Hafnium resists corrosion due to the formation of an oxide film on exposed surfaces. It is unaffected by all acids (apart from hydrogen fluoride) and all alkalis.

2018年3月31日 · 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 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/toxicity information, supplier lists, and more.

2025年2月1日 · Hafnium is a shiny, silvery-gray metal that is ductile and resistant to corrosion. It has two allotropes: α-Hafnium: Hexagonal close-packed (hcp) structure, stable at room temperature. β-Hafnium: Body-centered cubic (bcc) structure, stable at high temperatures. Hafnium and zirconium occur together and share many common characteristics.