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Group 5 contains vanadium (V), niobium (Nb), tantalum (Ta) and dubnium (Db). [1] This group lies in the d-block of the periodic table. This group is sometimes called the vanadium group or vanadium family after its lightest member; however, the group itself has not acquired a trivial name because it belongs to the broader grouping of the ...

Niobium is a chemical element; it has symbol Nb (formerly columbium, Cb) and atomic number 41. It is a light grey, crystalline, and ductile transition metal. Pure niobium has a Mohs hardness rating similar to pure titanium, [8] and it has similar ductility to iron.

2022年5月7日 · In chemistry, the IUPAC group 5 elements are the vanadium group elements. These are vanadium (V), niobium (Nb), tantalum (Ta), and dubnium (Db). Here is a look at the common properties shared by these elements, their uses, and their sources.

设1mol气体的体积为b ，则★ V_ {理想}=V-nb. 第二项修正是对压力项进行修正，要考虑分子间力对压力的影响。 当某一分子运动至器壁附近（发生碰撞），由于分子间的吸引作用而减弱了对器壁的碰撞作用，使实测压力比理想气体推测出的压力要小，故应在实测压力的基础上加上由于分子间力而减小的压力才等于理想气体的压力。 那么，如何定量地确定分子间力对压力的影响呢？ 由于气体分子对器壁的碰撞是弹性的，碰撞产生的压力与气体的浓度 \frac {n} {V} 成正比；同样， …

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2023年7月10日 · The V–Nb steel mainly comprised small–sized (V, Nb) (C, N) precipitates with sizes below 30 nm, which can significantly hinder dislocation movements and improve strength. The V–Nb–Ti steel consisted of more large–sized (V, …

The Van der Waals equation is a modification of the ideal gas equation that accounts for the volume occupied by gas molecules and the attractive forces between them.

2024年4月25日 · We have investigated the solidification microstructures of the non-equiatomic and equiatomic V-Nb-Mo-Ta-W alloys, which are one of the first refractory high entropy alloys, and found intriguing dual body-centered cubic (BCC) microstructures.