New Series CrLn₈Te₁₃Cl (Ln = Sm, Gd, Tb):  Pseudo-Misfit-Layer Compounds

Abstract

The compounds CrLn8Te13Cl (Ln = Sm, Gd, Tb) have been prepared from the solid-state reaction of Ln, Cr, Te, and CrCl3 at 850 °C. These isostructural compounds crystallize in a new structure type that comprises a succession along the c axis of alternating distorted double rock-salt-type layers and a related CdI2-type layer. This structure bears some resemblance to the framework of certain misfit layer compounds.

Rare-Earth Transition-Metal Chalcogenides

“…Magnetic Properties. 89 Sm 3 CrSe 6 and Tb 3 -CrSe 6 are paramagnetic down to 5 K. Gd 3 CrSe 6 exhibits an antiferromagnetic transition at 10 K. Since Sm 3 CrSe 6 and Tb 3 CrSe 6 do not order magnetically, the antiferromagnetic transition of Gd 3 CrSe 6 probably involves the Gd III centers.…”

“…These materials may be prepared from the stoichiometric reactions of the elements in a KBr flux at 1123 K. 89 Gd 3 CrSe 6 may also be obtained from the thermal decomposition of GdCrSe 3 at 1073 K. 88…”

“…Rb 3 Dy 4 Cu 5 Se 10 is paramagnetic in the range 5-300 K with a µ eff corresponding to Dy III . R. Ln 8 CrTe 13 Cl (Ln ) Sm, Gd, Tb) 145…”

Novel single-crystal's voltage-dependent effect and magnetic order of Ln2ZrQ5 (Ln = La, Sm, Gd; Q = S, Se) semiconductors

“…2a and 2c) behave as Van Vleck-type paramagnetism due to the L-S coupling and the low effective moment of the Sm 3+ ion, and they do not follow the Curie-Weiss law because the effective moment of their 4f electrons has a temperature dependence that arises from low-lying multiplets, 20 this distinct magnetic behavior is typical for Sm 3+ chalcogenides as a mixture of several energy levels occurs at high temperature, rendering the effective magnetic moment temperature-dependent. 21 The inverse molar susceptibilities of 3 (Fig. 2b) indicate that it is paramagnetic down to 13 K. Linear fitting of the magnetic data of 3 in the temperature range 2-300 K using the Curie-Weiss law gives the experimental values C = 11.53 K and θ p = −9.97 (2) cm 3 K mol −1 .…”

KCaEr2CuS5: A New Pentanary Rare-Earth Layered Chalcogenide without Substitutional Disorder

“…Reactive halide flux methods have produced many interesting rare-earth chalcogenides. − However, pentanary rare-earth chalcogenides without oxygen are rather rare and limited to mainly K 0.5 Ba 0.5 DyCu 1.5 Te 3 , LaCa 2 GeS 4 Cl 3 , La 3 - x Ce x (SiS 4 ) 2 I (0 < x < 1), LaCeSbS 5 Br, and (La 0.5 Ce 0.5 )SbS 2 Br 2 . K 0.5 Ba 0.5 DyCu 1.5 Te 3 is the first example containing four metallic elements, but this and all other compounds listed above are disordered substitutionally.…”