Understanding the structural properties of alloys 2D Transition-Metal Dichalcogenides

"Transition-metal dichalcogenides are a family of materials that has been of interest because of its 2D intrinsic character, their novel properties and, exotic ground states including charge density wave, superconductivity and topological insulators [1].
Alloys of TMDs are a platform to study the inherited properties of pattern compounds to its mixtures, and to look for the optimization of certain properties as doping changes. Recently was shown the emergence of multiferroic states in alloys of WTe2 and WSe2, namely W[Se1-xTex]2(1-δ) being x the tellurium fraction and δ the chalcogen vacancies [2]. In that work was proposed that chalcogen vacancies could play an important role as the physical mechanism behind ferromagnetism and ferroelectricity.
In this seminar we will present some insights on the effect of Te-doping [3,4] and chalcogen vacancy levels [2] on the structure of W[Se1-xTex]2(1-δ). We will focus our attention on the 2H-W[Se1-xTex]2(1-δ), x References
[1] Manzeli, S., Ovchinnikov, D., Pasquier, D., Yazyev, O. V., & Kis, A. (2017). 2D transition metal dichalcogenides. Nature Reviews Materials, 2(8), 1-15.
[2] Cardenas-Chirivi, G., Vega-Bustos, K., Rojas-Páez, H., Silvera-Vega, D., Pazos, J., Herrera, O., ... & Giraldo-Gallo, P. (2023). Room temperature multiferroicity in a transition metal dichalcogenide. npj 2D Materials and Applications, 7(1), 54.
[3] Mentzen, B. F., & Sienko, M. J. (1976). Preparation and x-ray study of mixed-anion tungsten dichalcogenides. Inorganic Chemistry, 15(9), 2198-2202.
[4] Yu, P., Lin, J., Sun, L., Le, Q. L., Yu, X., Gao, G., ... & Liu, Z. (2017). Metal–Semiconductor Phase‐Transition in WSe2 (1‐x) Te2x Monolayer. Advanced Materials, 29(4), 1603991.
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