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It has many polymorphic forms all based largely on octahedrally coordinated niobium atoms. [3] [4] The polymorphs are identified with a variety of prefixes.[3] [4] The form most commonly encountered is monoclinic H-Nb 2 O 5, which has a complex structure with a unit cell containing 28 niobium atoms and 70 oxygen, where 27 of the niobium atoms are octahedrally coordinated and one tetrahedrally. [5]
Niobium oxide, archaically called columbium oxide, [1] may refer to: Niobium monoxide (niobium(II) oxide), NbO; Niobium dioxide (niobium(IV) oxide), NbO 2; Niobium pentoxide (niobium(V) oxide), Nb 2 O 5; In addition to the above, other distinct oxides exist general formula Nb 3n+1 O 8n−2 where n ranges from 5 - 8 inclusive, e.g. Nb 8 O 19 (Nb ...
Prices of hydrogen produced by distributed steam methane reforming, as predicted by H2A Production Model from United States Department of Energy, [9] assuming price of natural gas of US$3/MMBtu (US$10/MWh; US$0.10/m 3). Does not include cost of storage and distribution. 1: 2 H (D) Deuterium: 0.0001667 [10] 13 400: 2.23: 2020: CIL [11]
Niobium oxychloride is prepared by treating the pentachloride with oxygen: [4] NbCl 5 + 1 / 2 O 2 → NbOCl 3 + Cl 2. This reaction is conducted at about 200 °C. NbOCl 3 also forms as a major side-product in the reaction of niobium pentoxide with various chlorinating agents such as carbon tetrachloride and thionyl chloride.
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Vanadium(V) oxide or vanadium pentoxide is the most common, being precursor to most alloys and compounds of vanadium, and is also a widely used industrial catalyst. [29] Niobium forms oxides in the oxidation states +5 (Nb 2 O 5), [30] +4 (NbO 2), and the rarer oxidation state, +2 . [31]