Tai Kong

RE3Mo14O30 and RE2Mo9O19, Two Reduced Rare-Earth Molybdates with Honeycomb-Related Structures (RE = La–Pr)

The previously unreported RE3Mo14O30 and RE2Mo9O19 phases were synthesized in vacuo from rare-earth oxides, molybdenum oxide, and molybdenum metal using halide fluxes at 875-1000 °C. Both phases adopt structures in the triclinic P1̅ space group albeit with several notable differences. The structures display an ordering of layers along the a direction of the unit cell, forming distinct honeycomb-related lattice arrangements composed of MoO6 octahedra and vacancies. Mo-Mo bonding and clusters are present; the RE3Mo14O30 structure contains Mo dimers and rhomboid tetramers, while the RE2Mo9O19 structure contains rhomboid tetramers and an unusual arrangement of planar tetramers, pentamers, and hexamers. The magnetic measurements found the RE2Mo9O19 phases to be simple paramagnets, while La3Mo14O30 was observed to order antiferromagnetically at 18 K. Electrical resistivity measurements confirmed all of the samples to behave as nondegenerate semiconductors.

Superconductivity in the Nb-Ru-Ge σ phase

We show that the previously unreported ternary

Monoclinic 122-Type BaIr2Ge2 with a Channel Framework: A Structural Connection between Clathrate and Layered Compounds

\sigma

High-entropy alloy superconductors on an α-Mn lattice

-phase material Nb

Anisotropic magnetic properties of the triangular plane lattice material TmMgGaO4

_{20.4}

Sc–Zr–Nb–Rh–Pd and Sc–Zr–Nb–Ta–Rh–Pd High-Entropy Alloy Superconductors on a CsCl-Type Lattice

Ru

Anisotropic magnetic properties of the ferromagnetic semiconductor CrSbSe3

_{5.7}

Crystal structure and elementary properties of PbS2 with a pressure–stabilized S-S dimer

Ge

Crystal growth, crystal structure and anisotropic magnetic properties of KBaR(BO3)2 (R = Y, Gd, Tb, Dy, Ho, Tm, Yb and Lu) triangular lattice materials

_{3.9}

The σ-Phase Superconductors Nb20.4Rh5.7Ge3.9 and Nb20.4Rh5.7Si3.9

is a superconductor with a critical temperature of 2.2 K. Temperature-dependent magnetic susceptibility, resistance, and specific heat measurements were used to characterize the superconducting transition. The Sommerfeld constant