A new low temperature modification of TaTe2—Comparison to the room temperature and the hypothetical 1T-TaTe2 modification

Trimer bonding states on the surface of the transition-metal dichalcogenide TaTe2

“…At room temperature (RT), previous X-ray analysis indicates that the bulk is already distorted, and the corresponding exposed surface is shown in Fig. 1(c) [22,37]. Here the structural change is due to the emergence of double zigzag trimer chains of the Ta atoms.…”

“…Under the same symmetry, the structural difference depends only on the bonding distance of different types of Ta atoms. In the bulk, the distance between Ta1 and Ta2 atoms is ~ 3.31 Å and the distance between edge Ta2 atoms is ~ 4.48 Å [22]. The short and long bonding distances are represented by red sticks and blue dashed lines in Fig.…”

“…In contrast, TaTe2 has 3×1 double zigzag stripe superstructure at room temperature, and transforms into 3×3 "butterfly" like superstructure around 170 K [22]. It still remains an open question why the more distorted structure at low temperature shows decreased resistance with enhanced magnetic susceptibility [22], which is counterintuitive since CDW-like distortions usually result in reduced density of states at the Fermi level. To understand this behavior, it is beneficial to first proceed from the emergence of 3×1 superstructure in RT phase from the ideal 1T structure.…”

Anisotropic magneto-transport and magnetic properties of low-temperature phase of TaTe 2

“…2 (a). Below the phase transition temperature, the Ta atoms tend to be clustered accompanied forming two types rhombuses along b axis 8 , resulting in the unit cell expanding three times larger than that of 1T'-TaTe2.…”

Microwave‐Assisted Synthesis of Few‐Layered TaTe2 and Its Application as Supercapacitor

“…Their crystals can exhibit ionic, covalent, and metallic bonding interactions. [26][27][28][29][30][31] In particular, the relatively low electronegativity of tellurium in transition metal tellurides frequently leads to complex competition between metals and nonmetals for the valence electrons and, as a consequence, to valence electron localizations. It is interesting to note that TaTe 2 has been reported to have a distorted 1T structure with space group C2/m.…”