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Tantalum is estimated to make up about 1 ppm [44] or 2 ppm [36] of the Earth's crust by weight. There are many species of tantalum minerals, only some of which are so far being used by industry as raw materials: tantalite (a series consisting of tantalite-(Fe), tantalite-(Mn) and tantalite-(Mg)), microlite (now a group name), wodginite ...
Many oxides of tantalum are called tantalates. They are viewed as derivatives of "tantalic acid", hypothetic compounds with the formulas Ta 2 O 5 ·nH 2 O [1] or HTaO 3 [2]). Examples of such tantalates are lithium tantalate (LiTaO 3), lutetium tantalate (LuTaO 4), neodymium tantalate (NdTaO 4) and lead scandium tantalate (PST or Pb(Sc x Ta 1-x ...
The pure tantalum hydrogen fluoride solution is then neutralised with aqueous ammonia to give hydrated tantalum oxide (Ta 2 O 5 (H 2 O) x), which is calcinated to tantalum pentoxide (Ta 2 O 5) as described in these idealized equations: [3] H 2 [TaF 7] + 5 H 2 O + 7 NH 3 → 1 / 2 Ta 2 O 5 (H 2 O) 5 + 7 NH 4 F Ta 2 O 5 (H 2 O) 5 → Ta 2 ...
Tetravalent VOSO 4 has been reported to be at least 5 times more toxic than trivalent V 2 O 3. [103] The Occupational Safety and Health Administration has set an exposure limit of 0.05 mg/m 3 for vanadium pentoxide dust and 0.1 mg/m 3 for vanadium pentoxide fumes in workplace air for an 8-hour workday, 40-hour work week. [104]
Tantalum diselenide is a compound made with tantalum and selenium atoms, with chemical formula TaSe 2, which belongs to the family of transition metal dichalcogenides.In contrast to molybdenum disulfide (MoS 2) [1] or rhenium disulfide (ReS 2), [2] tantalum diselenide does not occur spontaneously in nature, but it can be synthesized.
Ozin, G. A.; Walton, R. A. (1970). "Vibrational spectra and structures of the 1:1 complexes of niobium and tantalum, pentachlorides and tantalum pentabromide with aceto-, perdeuterioaceto-, and propionitriles in the solid and solution states and a vibrational analysis of the species MX 5, NC·CY 3 (Y = H or D)". J. Chem. Soc. A: 2236– 2239.
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Single crystals of TaB, Ta 5 B 6, Ta 3 B 4 or TaB 2 (about 1 cm diameter, 6 cm length) can be produced by the floating zone method. [2] [3]Tantalum boride films can be deposited from a gas mixture of TaCl 5-BCl 3-H 2-Ar in the temperature range 540–800 °C.