Syntheses, Structures, Physical Properties, and Theoretical Study of LaCu_0.40Te₂, NdCu_0.37Te₂, SmCu_0.34Te₂, GdCu_0.33Te₂, and DyCu_0.32Te₂

Abstract

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Gd3Cu2Te7 and U2Cu0.78Te6: Two Examples of Linear Te Chains

“…The formal oxidation states of Te atoms are closely correlated with Te}Te bonding distances. The relationship between the charge on Te and bond distances has been discussed elsewhere (25).…”

Revealing Tendencies in the Electronic Structures of Polar Intermetallic Compounds

“…LaCuxTe2 (0.28 ≤ x ≤ 0.50) and Gd3Cu2Te7 are both tellurides whose crystal structures comprise linear undistorted tellurium chains (Figure 4) [87][88][89]98]. The occurrence of such undistorted linear tellurium chains is noteworthy, because low-dimensional tellurium building units, largely in the forms of tellurium square nets, often undergo structural distortions due to the formations of charge density waves [116][117][118][119][120][121].…”

“…Corresponding to the formations of charge density waves, the structural distortions in low-dimensional structural fragments are associated with the openings of band gaps at the Fermi levels, which reduce the electronic energies relative to those of the metallic states and, hence, alleviate electronic instabilities below certain transition temperatures [122,123]. Notably, the measurements of the temperature-dependent electrical conductivity behavior for LaCuxTe2 (0.28 ≤ x ≤ 0.50) revealed that this telluride should be a semiconductor [88,89]. Additional inspections of the X-ray diffraction patterns of SmCu0.34Te2 being isostructural with LaCuxTe2 (0.28 ≤ x ≤ 0.50) bared the presence of weak reflections pointing to a superstructure along the direction of the linear tellurium chains.…”

Crystal structures of the compounds R3CuSe6 (R = Gd, Tb and Dy) and TbCu0.34Te2

“…The formation of the compounds RCu x Te 2 (R = Ce, Pr, Nd, Sm, Gd and Dy) isostructural to LaCu 0.28 Te 2 have been established in Refs. [4][5][6].…”