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Tantalum diselenide
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Tantalum diselenide is a compound made with tantalum and selenium atoms, with chemical formula TaSe2, which belongs to the family of transition metal dichalcogenides. In contrast to molybdenum disulfide (MoS2) or rhenium disulfide (ReS2), tantalum diselenide does not occur spontaneously in nature, but it can be synthesized. Depending on the growth parameters, different types of crystal structures can be stabilized.
Tantalum diselenide
Tantalum diselenide
On the left, how tantalum and selenium atoms are stacked in the 1T phase. On the right, how selenium atoms are bounded to the central tantalum atom. R
On the left, how tantalum and selenium atoms are stacked in the 1T phase. On the right, how selenium atoms are bounded to the central tantalum atom. Red is selenium while light blue is tantalum.
On the left, how tantalum and selenium atoms are stacked in the 2H phase. On the right, how selenium atoms are bounded to the central tantalum atom. R
On the left, how tantalum and selenium atoms are stacked in the 2H phase. On the right, how selenium atoms are bounded to the central tantalum atom. Red is selenium while light blue is tantalum.
Charge Density Wave (star of David reconstruction) scheme for 1T tantalum diselenide. Red is selenium, while in light blue is tantalum in A site, gree
Charge Density Wave (star of David reconstruction) scheme for 1T tantalum diselenide. Red is selenium, while in light blue is tantalum in A site, green is tantalum in B site and yellow is tantalum in C site.
Tantalum(IV) sulfide
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Tantalum(IV) sulfide is an inorganic compound with the formula TaS2. It is a layered compound with three-coordinate sulfide centres and trigonal prismatic or octahedral metal centres. It is structurally similar to molybdenum disulfide MoS2, and numerous other transition metal dichalcogenides. Tantalum disulfide has three polymorphs 1T-TaS2, 2H-TaS2, and 3R-TaS2, representing trigonal, hexagonal, and rhombohedral respectively.
Sample polycrystalline TaS2
Sample polycrystalline TaS2
1T-TaS2 crystals grown by transport reaction
1T-TaS2 crystals grown by transport reaction
(a): Schematic of the David star pattern in 1T-TaS2 where green atoms are S and purple are Ta. (b) and (c) are STM images (6.5 K) before and after app
(a): Schematic of the David star pattern in 1T-TaS2 where green atoms are S and purple are Ta. (b) and (c) are STM images (6.5 K) before and after application of 2.8 V pulses through the STM tip. Insets show ~10 times magnified images.