Preparation and Characterization of a High-Entropy Magnet, (Mg, Mn, Co, Ni, Cu)TeO.

We report on the synthesis of MgMnCoNiCuTeO, which is isostructural with multiferroic MnTeO (space group ). Study of its magnetic properties indicates establishment of the long-range antiferromagnetic order at 16.3 K, slightly lower than that of pure MnTeO.

Preparation and Properties of a High-Entropy Wolframite-Type Antiferromagnet, (MnCoNiCuCd)WO.

The homogeneous high-entropy wolframite-type solid solution (MnCoNiCuCd)WO was prepared by solid-state reaction at 1000 °C. Elongated "crystals" were grown from the NaWO flux, but their strongly broadened powder X-ray diffraction patterns indicated partial dissolution. Nevertheless, successive annealing of the homogeneous solid solution for 3-4 h at 800, 700, and 600 °C did not bring any sign of dissolution.

Spin-Cluster Glassy and Long-Range Ordered Magnetic States in Honeycomb-Layered Compositionally Complex Oxides NaLiTSbO (T = CuNiCo).

The concept of high-entropy oxides has triggered extensive research of this novel class of materials because their numerous functional properties are usually not mere linear combinations of those of the components. Here, we introduce the new series of compositionally complex honeycomb-layered magnets NaLiTSbO (T = CuNiCo). An unusual feature of the system is its nonmonotonous dependences of the monoclinic lattice parameters and β on .

Copper(II) coordination compounds based on bis-hydrazones of 2,6-diacetylpyridine: synthesis, structure, and cytotoxic activity.

By reacting a series of 2,6-diacetylpyridine bis-hydrazones containing pyrimidine (H2L1), benzimidazole (H2L2) and phthalazine (H2L3) heterocyclic fragments with copper(II) chloride and bromide, a variety of pentacoordinated complexes of the composition , and , where X = Cl, Br, are formed. The properties and structure of the compounds were studied by means of NMR, IR, UV-vis, ESR, and X-ray absorption spectroscopy, cyclic voltammetry and X-Ray single crystal diffraction methods. It was shown that complexes of the cationic type have an asymmetric structure with a distorted square-pyramidal geometry of the coordination unit.

Successive short- and long-range magnetic ordering in rosiaite-type CoGeTeO prepared by ion-exchange reaction.

The missing member of the rosiaite family, CoGeTeO, was synthesized by mild ion-exchange reactions and characterized by magnetization and specific heat measurements. It exhibits a successive short- and long-range magnetic ordering at ≈ 45 K and = 15 K, respectively. Based on these measurements, the magnetic - phase diagram was established, showing two antiferromagnetic phases separated by a spin-flop transition.