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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
Melting point: 1,512 °C (2,754 °F; 1,785 K) Solubility in water. insoluble Solubility: ... Niobium pentoxide is the inorganic compound with the formula Nb 2 O 5. A ...
The Gmelin rare earths handbook lists 1522 °C and 1550 °C as two melting points given in the literature, the most recent reference [Handbook on the chemistry and physics of rare earths, vol.12 (1989)] is given with 1529 °C.
Niobium forms halides in the oxidation states of +5 and +4 as well as diverse substoichiometric compounds. [26] [51] 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-1% zirconium is used in rocketry and in the nuclear industry. It is regarded as a low-strength alloy. [1] [2]C-103, which is 89% Nb, 10% Hf and 1% Ti, is used for the rocket nozzle of the Apollo service module and the Merlin vacuum [3] engines; it is regarded as a medium-strength alloy.
Most definitions of the term 'refractory metals' list the extraordinarily high melting point as a key requirement for inclusion. By one definition, a melting point above 4,000 °F (2,200 °C) is necessary to qualify, which includes iridium, osmium, niobium, molybdenum, tantalum, tungsten, rhenium, rhodium, ruthenium and hafnium. [2]
Niobium carbide has a Young's modulus of approximately 452 GPa, and a shear modulus of 182 GPa. [1] It has a Poisson's ratio of 0.227. [1]Niobium carbide is a frequent intentional product in microalloyed steels due to its extremely low solubility product in austenite, the lowest of all the refractory metal carbides.
Niobium dioxide, is the chemical compound with the formula NbO 2. It is a bluish-black non-stoichiometric solid with a composition range of NbO 1.94 -NbO 2.09 . [ 1 ] It can be prepared by reducing Nb 2 O 5 with H 2 at 800–1350 °C. [ 1 ]