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Tantalum is a chemical element; it has symbol Ta and atomic number 73. Previously known as tantalium , [ citation needed ] it is named after Tantalus , a figure in Greek mythology. [ 11 ] Tantalum is a very hard, ductile , lustrous , blue-gray transition metal that is highly corrosion-resistant.
A teaching assistant interacts with a reading child in October 2006 at U.S. Sasebo Naval base. A teaching assistant (TA) or education assistant (EA) is an individual who assists a professor or teacher with instructional responsibilities.
A high pressure form (Z-Ta 2 O 5) has also been reported, in which the Ta atoms adopt a 7 coordinate geometry to give a monoclinic structure (space group C2). [ 10 ] Purely amorphous tantalum pentoxide has a similar local structure to the crystalline polymorphs, built from TaO 6 and TaO 7 polyhedra, while the molten liquid phase has a distinct ...
Application. Tantalum carbide is widely used as sintering additive in ultra-high temperature ceramics ... Ta, Mo, W)C to form a lamellar eutectic structure, with the ...
2 Ta 5+ + 10 OH − → Ta 2 O 5 + 5 H 2 O The oxide forms on the surface of the tantalum, but it also grows into the material. For each unit thickness of oxide growth, one third grows out and two thirds grows in. Due to the limits of oxide growth, there is a limit on the maximum voltage rating of tantalum oxide for each of the presently ...
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Tantalum pentachloride, Ta 2 Cl 10, provides a convenient starting point. To avoid the generation of mixed chloride-ethoxide species, a base such as ammonia is usually added to trap liberated HCl: [8] 10 EtOH + Ta 2 Cl 10 + 10 NH 3 → Ta 2 (OEt) 10 + 10 NH 4 Cl. Salt metathesis using an alkali metal alkoxide can be used as well: [8]
Lithium tantalate is the inorganic compound with the formula Li Ta O 3. It is a white, diamagnetic, water-insoluble solid. The compound has the perovskite structure. It has optical, piezoelectric, and pyroelectric properties. Considerable information is available from commercial sources about this material. [2]