Superstructures and Chemical Bonding in Rare Earth Metal Polytellurides RETe2-δ 
(RE=La−Nd; Sm−Tm; 0≤δ≤0.2)

Doert, Thomas; Poddig, Hagen; Finzel, Kati

doi:10.1002/zaac.202300118

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Superstructures and Chemical Bonding in Rare Earth Metal Polytellurides RETe_2-δ (RE=La−Nd; Sm−Tm; 0≤δ≤0.2)

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Finzel, Kati
Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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引用

Doert, T., Poddig, H., & Finzel, K. (2023). Superstructures and Chemical Bonding in Rare Earth Metal Polytellurides RETe_2-δ (RE=La−Nd; Sm−Tm; 0≤δ≤0.2). Zeitschrift für anorganische und allgemeine Chemie, 649(16):, pp. 1-12. doi:10.1002/zaac.202300118.

引用: https://hdl.handle.net/21.11116/0000-000D-9464-B

要旨

Polychalcogenides REX2-δ (X=S, Se, Te; 0≤δ≤0.2) of trivalent rare earth metals RE have been investigated in recent years to shed light on the structural diversity as a function of compositional, metric, thermodynamic, and electronic situation. Whereas the former aspects have comparable influence on the structures of all polychalcogenides REX2-δ, the bonding situation was assumed different for tellurides due to tellurium's higher tendency to delocalize electrons. The crystal structures generally contain puckered [REX] double slabs and planar [X] layers, the latter hosting different distortions from a square-like arrangement. The distortion patterns of sulfides and selenides can be understood by a Zintl-type approach; they are dominated by localization of valence electrons in mono- (X2−) or dinuclear (X22−) anions only. This review discusses crystal structures of some rare-earth metal polytellurides RETe2-δ (0≤δ≤0.2) and bonding features in the chalcogenide layers and relates them to their sulfide and selenide counterparts. © 2023 The Authors. Zeitschrift für anorganische und allgemeine Chemie published by Wiley-VCH GmbH.