Tantalum selenides

Brown BE, Beemtsen DJ (1965) Layer stmcture polyt3 pism among niobium and tantalum selenides. Acta Crystallogr 18 31-36... 

Se2Ko7 Fa, Potassium tantalum selenide (Ko,7TaSe2). [158188-85-3). 30 167 Se2La20gTa3, Lanthanum tantalum oxide selenide (La2Ta30gSe2). [134853-92-2], 30 146... 

TaSei, Tantalum selenide (TaSe2), fl2039-55-3], 30 167 Ta2NS4C5H5, Tantalum sulfide (TaS2), compd. with pyridine (2 1), 133975-87-0]. 30 161... 

Table 22.5 Selenides and tellurides of vanadium, niobium and tantalum...

Selenium and Tellerium Tantalum is attacked by selenium and tellurium vapours at temperatures higher than 80°C. Only slight attack is observed on the metal by liquid selenides and tellurides of ytirum, the rare earths, and uranium at temperatures of 1300 to 2100°C, and tantalum is considered to be a satisfactory material in which to handle these intermetallic compounds. 

Fig. 1.3 Elements forming layered sulfides or selenides with the metal in octahedral or trigonal prismatic coordination (niobium and tantalum are found in both). (Adapted from [35])...

Vanadium(III) sulfide, V2S3 niobium(IV) sulfide, NbS2 niobium(IV) selenide, NbSe2 niobium(IV) telluride, NbTe2 tantalum(IV) sulfide, TaS2 tantalum(IV) selenide, TaSe2 tantalum(IV) telluride, TaTe2. 

Harbrecht B (1989) Ta2Se A tantalum-rich selenide with a new layer structure. Angew Chem Int Ed Eng 28 1660-1662... 

At red heat tantalum reacts with sulfur or hydrogen sulfide to form tantalum sulfide (Ta2S4). At lower temperatures the metal is completely inert. In like maimer, at elevated temperatures on the order of at least 800°C, tantalum powder or shavings react with elemental carbon, boron, and silicon to form the corresponding binary compoimds. Tantalum also reacts with vapors of phosphorus, selenium, and tellurium at comparable temperatures. In contrast, there is only slight attack on the metal by liquid selenides and tellurides of the rare earths and uranium in the range 1300-2100°C, and tantalum is considered a satisfactory material for handling these intermetallic compoimds. 

La2Se2Ta3, Lanthanum tantalum oxide selenide (La2Ta308Se2), (134853-92-2, 30 146... 

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