Niobium II oxide

Niobium(II) oxide NbO s Gray-black Insol, decomp -392.0... 

Further experiments were performed to ascertain the nature and to characterise the intermediate product of chlorination. The spectra recorded were similar for different temperatures and various types of alkali chloride mixtures (Figure 4.4.6). The results of oxidimetric titrations indicate the predominant formation of niobium(IV) species. Deviations of oxidation state to the higher values result from the partial oxidation of Nb(IV) into Nb(V) by HCI. Oxidation state values lower than four, obtained in the case of NbO chlorination, most likely were caused by niobium(II) oxide particles captured during melt sampling procedure and trapped in the quenched melt samples subjected to the analysis (Table 4.4.3). 

Niobium(V) bromide Niobium(V) chloride Niobium(V) fluoride Niobium(V) iodide Niobium nitride Niobium(II) oxide Niobium(IV) oxide Niobium(V) oxide Nitric acid Nitric oxide Nitrogen... 

Manganese trichloride oxide, 4141 Mercury(I) oxide , 4613 Mercury(II) oxide, 4605 Molybdenum(IV) oxide, 4716 Molybdenum(VI) oxide, 4717 Nickel(II) oxide, 4821 Nickel(III) oxide, 4823 Nickel(IV) oxide, 4822 Niobium(V) oxide, 4818 Osmium(IV) oxide, 4833 Osmium(VIII) oxide, 4858 Palladium(II) oxide, 4825 Palladium(III) oxide, 4848 Palladium(IV) oxide, 4835... 

D.3 (a) potassium phosphate (b) iron(II) iodide, ferrous iodide (c) niobium(V) oxide (d) copper(II) sulfate, cupric sulfate... 

Inoue, Y. et al.. Studies of the hydrous niobium(V) oxide ion exchanger. II. Affinity for various cations. Bull. Chem. Soc. Jpn, 58, 2955, 1985. 

Lewis base complexes, 83 Dichromates, 941, 943 Dihydrogen oxidative addition niobium(II) complexes, 678 niobium(III) complexes, 660 tantalum(II) complexes, 678 tantalum(III) complexes, 660... 

Because the sulfides of metals have a lower heat of formation than the oxides, some difficult-to-obtain metals can be made from their lulfides with aluminum. This process has been described by Gardner > for niobium (columbium) and tantalum from their disulfides (NbS and TaSj), whereby the relatively volatile by-product Al S, distills off above 1550°C. It is an interesting coincidence that the production of the same two metals by reduction of the pentoxides NbfOs and Ta s with silicon can be performed under formation of silicon (II) oxide (SiO), which volatilizes in vacuum. 

Nickel boride (Ni B) Nickel boride (Ni B) Nickel(II) bromide Nickel(II) chloride Nickel(II) fluoride Nickel(II) iodide Nickel(II) oxide Nickel(II) sulfide Nickel disulfide Nickel subsulfide Niobium... 

The known halides of vanadium, niobium and tantalum, are listed in Table 22.6. These are illustrative of the trends within this group which have already been alluded to. Vanadium(V) is only represented at present by the fluoride, and even vanadium(IV) does not form the iodide, though all the halides of vanadium(III) and vanadium(II) are known. Niobium and tantalum, on the other hand, form all the halides in the high oxidation state, and are in fact unique (apart only from protactinium) in forming pentaiodides. However in the -t-4 state, tantalum fails to form a fluoride and neither metal produces a trifluoride. In still lower oxidation states, niobium and tantalum give a number of (frequently nonstoichiometric) cluster compounds which can be considered to involve fragments of the metal lattice. 

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