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Niobium forms halides in the oxidation states of +5 and +4 as well as diverse substoichiometric compounds. [61] [64] The pentahalides (NbX 5) feature octahedral Nb centres. Niobium pentafluoride (NbF 5) is a white solid with a melting point of 79.0 °C and niobium pentachloride (NbCl 5) is
Niobium pentoxide is the inorganic compound with the formula Nb 2 O 5. A colorless, insoluble, and fairly unreactive solid, it is the most widespread precursor for other compounds and materials containing niobium. It is predominantly used in alloying, with other specialized applications in capacitors, optical glasses, and the production of ...
A niobium electrolytic capacitor (historically also Columbium capacitor [1] [2]) is an electrolytic capacitor whose anode (+) is made of passivated niobium metal or niobium monoxide, on which an insulating niobium pentoxide layer acts as a dielectric.
Niobium forms oxides in the oxidation states +5 (Nb 2 O 5), [30] +4 (NbO 2), and the rarer oxidation state, +2 . [31] Most common is the pentoxide, also being precursor to almost all niobium compounds and alloys.
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 16 O 38). [2] Nb 12 O 29 and Nb 47 O 116; Natural niobium oxide is ...
Niobium monoxide is the inorganic compound with the formula Nb O. It is a grey solid with metallic conductivity. ... It is used in capacitors where a layer of Nb 2 O ...
A prominent early synthetic application of organoniobium chemistry was the use of dimethoxyethane niobium trichloride, NbCl 3 (DME), as a reagent for the reductive coupling of imines with carbonyl compounds to form amino alcohols. [9] This reagent has found further use in other pinacol-type reductive couplings. [10] [8]
The Al and Cr form oxide layers that passivate the surface and protect the superalloy from further oxidation while B and Y are used to improve the adhesion of this oxide scale to the substrate. [4] Cr, Fe, Co, Mo and Re all preferentially partition to the γ matrix while Al, Ti, Nb, Ta, and V preferentially partition to the γ' precipitates and ...