No abstract

The intermetallic compound CaCoSi was synthesized by solid state synthesis and investigated by means of X-ray diffraction (both powder and single crystal method): PbClF type structure, P4/nmm (No.129): a = 3.977(1) Å, c = 7.089(5) Å, R 1 = 0.0303, 121 F 2 , 9 variable parameters. CaCoSi contains isolated [CoSi] 2-2D layers in

The solid solution SrNi2(P1−xGex)2 with ThCr2Si2‐type structure has been synthesized over the whole composition range by high‐temperature solid state reactions. Structure investigations were performed using X‐ray diffraction (XRD) methods. In addition, in situ temperature‐dependent powder XRD measurements down to 10 K were carried out for two SrNi2(P1−xGex)2 samples with x = 0.110(3) and 0.212(3), which indicate a temperature‐induced collapse of the structure of the first compound around 200 K. For both samples, superconductivity was detected above 1.8 K by magnetic, resistivity, and heat capacity measurements (TC ∼ 3.0 and 2.4 K, respectively). The crystal chemistry and the chemical bonding in the superconducting compounds are discussed in terms of linear muffin‐tin orbital (LMTO) band structure calculations including density of states (DOS), crystal orbital Hamilton populations (COHPs), and a topological analysis using the electron localization function (ELF).

The binary compound Ca4As3crystallizes in the Ba4P3 structure type and is thus a homologue of isotypic Sr4As3. The As atoms are connected by a single bond thus this calcium arsenide is a Zintl phase.

Ca11As10, tetragonal, I4/mmm (no. 139), a = 11.2532(1) Å, c = 16.2351(4) Å, and V = 2055.92(6) Å3, Z = 4, R gt (F) = 0.0347, wR ref (F 2) = 0.0931, T = 150 K.