Synthesis, Structure, Magnetism, and Optical Properties of Cs₂Cu₃DyTe₄

Abstract

CsCu(3)DyTe(4) was prepared by reacting copper, dysprosium, and tellurium with cesium azide at 850 °C in a fused silica ampule. This new telluride crystallizes in the monoclinic space group C2/m with lattice dimensions of a = 16.462(4) Å, b = 4.434(1) Å, c = 8. 881(2) Å, β = 108.609(12)° with Z = 2. Its crystal structure is dominated by (∞)(2){[Cu(3)DyTe(4)]}(1-) anionic layers separated by Cs(+) cations. The copper cations are disordered over three different tetrahedral sites. The [DyTe(6)](9-) polyhedra form infinite (∞)(1){[DyTe(4)](5-)} chains. Magnetism studies conducted on this semiconductor suggest complex magnetic interactions between the Dy(3+) cations with a strong deviation from Curie-type behavior at low temperatures below 40 K.

Synthesis, Structure, and Spectroscopy of Two Ternary Uranium(IV) Thiophosphates: UP2S9 and UP2S7 Containing P2S92– and P2S72– Ligands

“…The single crystal optical transmission measurements done on UP 2 S 9 and UP 2 S 7 crystals lead to the same sharp band gap of 1.41 eV. Both compounds are thus semiconductors, and the broad absorption peak observed around 1.0 eV on the two spectra (Figure ) can be attributed to the f-f transition since the uranium cations here are 5f 2 , meanwhile similar peaks have been observed in many 4f n and 5f n compounds. − …”

A6U3Sb2P8S32 (A = Rb, Cs): Quinary Uranium(IV) Thiophosphates Containing the [Sb(PS4)3]6– Anion

“…Attempts to increase the yield by modification of stoichiometry or reaction conditions were unsuccessful. Moreover, the use of AN 3 as alkali metal source as previously reported 19 significantly decreased the formation of crystals of both the desired compounds and the byproducts. Crystal Structure Determination.…”

Discovery-Synthesis, Design, and Prediction of Chalcogenide Phases

“…Metal chalcogenides are also at the cutting edge of many research areas. Some examples include optical information storage, − nonlinear optics, − photovoltaic energy conversion, − thermoelectric energy conversion, ,− radiation detectors, − thin-film electronics, − Li–S and Mg–S batteries, − fast-ion conductivity, , catalysis, − spintronics, − topological insulators, − science in two dimensions, ,,− novel magnetism, − and unconventional superconductivity. − Simpler chalcogenides have been more extensively investigated than ternary − and quaternary ones, ,,− although the latter promise equally or more attractive properties. − …”