Redetermination of K4[Bi2Cl10]·4H2O

In comparison with the previous refinement of tetra­potassium di-μ-chlorido-bis­[tetra­chloridobismuthate(III)] tetra­hydrate [Volkova, Udovenko, Levin & Shevchenko (1983). Koord. Khim. 9, 356–360], the current redetermination reveals anisotropic displacement parameters for all non-H atoms, localization of the H atoms, and higher precision of lattice parameters and inter­atomic distances. The crystal structure is built up of edge-sharing [Bi2Cl10]4− double octa­hedra with the bridging Cl atoms situated on a mirror plane, three K+ counter-cations (two of which are on mirror planes), and two water mol­ecules that are solely coordinated to the K+ cations. These building units are linked into a three-dimensional network structure. Additional O—H⋯Cl hydrogen bonds between the water mol­ecules and the complex anions stabilize this arrangement

NdNiMg₅, a New Magnesium-Rich Phase with an Unusual Structural Type

The new intermetallic NdNiMg₅ was discovered during the study of the Mg-rich part of the Mg–Nd–Ni system. It was synthetized by melting of the constituent elements in a sealed tantalum tube with subsequent annealing. Its structure was determined by X-ray diffraction on a single crystal. Crystal data: orthorhombic system, <i>Cmcm</i>, <i>Z</i> = 4, <i>a</i> = 4.4799(2) Å, <i>b</i> = 9.9827(3) Å, <i>c</i> = 13.7854(10) Å, <i>d</i>_calc = 3.49 g·cm^–3. Its structure is made of infinite layers of Mg atoms that form blocks stacked along the <i>c</i> axis. These blocks, with a close-packed array of Mg atoms, are separated by infinite NiNd layers and connected through short Mg–Mg bonds. In the NiNd layer, the Ni and Nd atoms form an ordered graphite-type network. Antiferromagnetic ordering is observed with <i>T</i>_N = 12 K, and the effective magnetic moment μ_eff is equal to 3.89(1) μ_B

NdNiMg5, a New Magnesium-Rich Phase with an Unusual Structural Type.

The new intermetallic NdNiMg5 was discovered during the study of the Mg-rich part of the Mg-Nd-Ni system. It was synthetized by melting of the constituent elements in a sealed tantalum tube with subsequent annealing. Its structure was determined by X-ray diffraction on a single crystal. Crystal data: orthorhombic system, Cmcm, Z = 4, a = 4.4799(2) Å, b = 9.9827(3) Å, c = 13.7854(10) Å, dcalc = 3.49 g*cm(-3). Its structure is made of infinite layers of Mg atoms that form blocks stacked along the c axis. These blocks, with a close-packed array of Mg atoms, are separated by infinite NiNd layers and connected through short Mg-Mg bonds. In the NiNd layer, the Ni and Nd atoms form an ordered graphite-type network. Antiferromagnetic ordering is observed with TN = 12 K, and the effective magnetic moment μeff is equal to 3.89(1) μB