Adaptation of the BaAl Type to Small Cations: The Case of NaGa.

Single-phase NaGa samples were prepared by annealing stoichiometric element mixtures at 200 °C, 300 °C, and 450 °C in closed tantalum ampoules. No compositional homogeneity range was detected. While single crystals annealed at 200 °C feature a fully ordered crystal structure, a crystal annealed at 300 °C reveals a defect with mutual exchange of Na atoms and Ga dumbbells.

Double Helix of Icosahedra Structure and Spin Glass Magnetism of the δ-CoZnMn ( = 0.4-3.5) Pseudo-Binary Alloys.

We have synthesized δ-CoZnMn ( = 0.4-3.5) pseudo-binary alloys of 10 different compositions by a high-temperature solid-state synthetic route, determined their crystal structures and the Mn substitution pattern, and estimated the existence range of the δ-phase.

The Kondo Effect in CeLaLuScY ( = 0.05-1.0) High-Entropy Alloys.

In the search for electronic phenomena in high-entropy alloys (HEAs) that go beyond the independent-electron description, we have synthesized a series of hexagonal rare earth (RE)-based HEAs: CeLaLuScY ( = 0.05-1.0).

Complex magnetism of single-crystalline AlCoCrFeNi nanostructured high-entropy alloy.

We have investigated magnetism of the AlCoCrFeNi single-crystalline high-entropy alloy. The material is nanostructured, composed of a B2 matrix with dispersed spherical-like A2 nanoparticles of average diameter 64 nm. The magnetism was studied from 2 to 400 K via direct-current magnetization, hysteresis curves, alternating-current magnetic susceptibility, and thermoremanent magnetization time decay, to determine the magnetic state that develops in this highly structurally and chemically inhomogeneous material.

NaGa: A Zintl-Wade Phase Related to "α-Tetragonal Boron".

NaGa crystallizes with the orthorhombic space group (no. 62; = 14.8580(6) Å, = 8.

Crystal Structure and Ferromagnetism of the CeFeSi Intermetallic Compound.

We have determined the crystal structure and the magnetic state of the CeFeSi intermetallic compound. Our revised structural model (fully ordered tetragonal unit cell, 4/) agrees with the previous literature report, except for some minor quantitative differences. Magnetically, the CeFeSi undergoes a ferromagnetic transition at the temperature ≈ 94 K.

Electronic Structure and Magnetic Properties of a High-Spin Mn Complex: [Mn(mesacac) ] (mesacac=1,3-Bis(2,4,6-trimethylphenyl)-propane-1,3-dionato).

Metal acetylacetonates of the general formula [M(acac) ] (M =Cr, Mn, Fe, Co) are among the best investigated coordination compounds. Many of these first-row transition metal complexes are known to have unique electronic properties. Independently, photophysical research with different β-diketonate ligands pointed towards the possibility of a special effect of the 2,4,6-trimethylphenyl substituted acetylacetonate (mesacac) on the electron distribution between ligand and metal (MLCT).

A Borosilicide with Clathrate VIII Structure.

The high-pressure phase NaBSi (3 < < 5) is the first representative of a borosilicide crystallizing in the rarely occurring clathrate VIII type structure. Crystals with composition NaBSi (space group 43̅; = 9.7187(2) Å; Pearson symbol 54) were obtained at 5-8 GPa and 1200 K.

The Effect of Scandium on the Structure, Microstructure and Superconductivity of Equimolar Sc-Hf-Nb-Ta-Ti-Zr Refractory High-Entropy Alloys.

In this study, we investigate the scandium-containing Sc-Hf-Nb-Ta-Ti-Zr system of refractory high-entropy alloys (HEAs). Using the arc-melting method, we synthesized nine equimolar alloys (five 4-, three 5- and one 6-component), with all of them containing Sc. The alloys were characterized by XRD, electron microscopy and EDS, while superconductivity was investigated via electrical resistivity, specific heat and the Meissner effect.

Electronic transport properties of the AlTiZrPdCuNi alloy in the high-entropy alloy and metallic glass forms.

High-entropy alloys (HEAs) are characterized by a simultaneous presence of a crystal lattice and an amorphous-type chemical (substitutional) disorder. In order to unravel the effect of crystal-glass duality on the electronic transport properties of HEAs, we performed a comparative study of the electronic transport coefficients of a 6-component alloy AlTiZrPdCuNi that can be prepared either as a HEA or as a metallic glass (MG) at the same chemical composition. The HEA and the MG states of the AlTiZrPdCuNi alloy both show large, negative-temperature-coefficient resistivity, positive thermopower, positive Hall coefficient and small thermal conductivity.

The Intermetallic Semiconductor -IrGa: a Material in the State.

The compound IrGa was synthesized by direct reaction of the elements. It is formed as a high-temperature phase in the Ir-Ga system. Single-crystal X-ray diffraction analysis confirms the tetragonal symmetry (space group 4 , No.

MgPt: Anionic Chains in a EuGa-Type Structure.

The binary phase MgPt was prepared by direct reaction between the elements or by spark-plasma synthesis starting with MgH and PtCl. The compound crystallizes in the monoclinic space group 2/ with = 7.2096(3) Å, = 7.

Structure and Spin-Glass Magnetism of the MnNiZn Pseudobinary γ-Brasses at Low Mn Contents.

The pseudobinary MnNiZn γ-brass-type phases at low Mn dopant levels ( = 0.1-0.5) were investigated.

Structure and Superconductivity of Tin-Containing HfTiZrSn ( = Cu, Fe, Nb, Ni) Medium-Entropy and High-Entropy Alloys.

In an attempt to incorporate tin (Sn) into high-entropy alloys composed of refractory metals Hf, Nb, Ti and Zr with the addition of 3 transition metals Cu, Fe, and Ni, we synthesized a series of alloys in the system HfTiZrSn ( = Cu, Fe, Nb, Ni). The alloys were characterized crystallographically, microstructurally, and compositionally, and their physical properties were determined, with the emphasis on superconductivity. All Sn-containing alloys are multi-phase mixtures of intermetallic compounds (in most cases four).

The Reduced Nitridogermanates(III) Ca [Ge N ] and Sr [Ge N ] with Ge-Ge Bonds.

The first nitridogermanates(III) Ca [Ge N ] and Sr [Ge N ] were synthesized from sodium flux and structurally characterized by powder and single crystal X-ray diffraction, respectively. They crystallize isostructurally to each other and homeotypic to Ca [Cr N ]H in space group R . They feature unprecedented, mutually isolated, ethane-like [Ge N ] anions in a staggered conformation.

Cage Adaption by High-Pressure Synthesis: The Clathrate-I Borosilicide RbBSi.

RbBSi forms under high-pressure, high-temperature conditions at = 8 GPa and = 1273 K. The new compound (space group 3̅, = 9.9583(1) Å) is the second example for a clathrate-I borosilicide.

Structural Peculiarities and Thermoelectric Study of Iron Indium Thiospinel.

The homogeneity range of ternary iron indium thiospinel at 873 K was investigated. A detailed study was focused on two distinct series (y=z): 1) a previously reported charge-balanced (In □ ) [In Fe ] S (A1-series; □ stands for vacancy; the abbreviations "tetr" and "oct" indicate atoms occupying tetrahedral 8a and octahedral 16d sites, respectively) and 2) a new charge-unbalanced (In □ ) [In Fe ] S (A2-series). Fe atoms were confirmed to exclusively occupy an octahedral position in both series.