Four binary lanthanum stannides, α‐LaSn (I), La3Sn4 (II), La11Sn10 (III), and β‐LaSn (IV) are characterized by single crystal XRD and FP‐LAPW electronic band structure calculations.

Structure D 2000Cadmium-Auride A II CdxAu2-x (A II : Ca, Sr) -Synthesis, Crystal Structure, Chemical Bonding. -The title systems (prepared from melts of the elements) are characterized by XRD and FP-LAPW electronic band structure calculations. SrCd2 and the low-temperature modification of CaCd2 crystallize in the orthorhombic space group Imma with Z = 4. The high-temperature form of CaCd2 crystallizes in the hexagonal space group P63/mmc with Z = 4. CaCdAu, CaCd0.76Au1.24, SrCd0.86Au1.14, and SrCd 0.45 Au 1.55 crystallize in the orthorhombic space group Pnma with Z = 4. Ca5Cd2Au10 crystallizes in the orthorhombic space group Cmca with Z = 4, and the new compounds Ca11Cd18Au4 and Ca11Cd18.6Au3.4 in the tetragonal space group I41/amd with Z = 4. These compounds exhibit complicated Cd/Au polyanions with four-, five-, and six-bonded Cd/Au atoms. -(HARMS, W.; DUERR, I.; ROEHR*, C.

The New Complex Lanthanum Tetrelide La 55 Sn 36.6 Ge 24.4 . -The new title compound is prepared by melting a stoichiometric mixture of the elements and its structure is determined by single crystal XRD. La55Sn36.6Ge24.4 crystallizes in the orthorhombic space group Cmcm with Z = 4. In addition to isolated Ge atoms, isolated Sn atoms, bent [Sn3] trimers, and planar [Sn4] rings, the structure contains eight-membered planar chain pieces [M 8 ] (M: Ge, Sn), which exhibit cis, trans, and also linear conformations. The structure of the title compound also contains polyanions [M24] consisting of eight-membered Ge rings, in which all atoms are bonded in a trigonal planar geometry. These rings are connected via two-bonded M pairs to form ribbons. A simple electron count reveals that the title compound is an electron precise Zintl phase. -(DUERR, I.; ROEHR*, C.; J. Alloys Compd. 514 (2012) 81-90, http://dx.

The Binary Tin-Rich Lanthanum Stannides La 2 Sn 5 and La 3 Sn 7 -A Structural and Bond Theoretical Study. -LaSn3, La2Sn3, and La3Sn7 are synthesized from melts of the elements by slow cooling or arc melting and quenching, and their crystal structures are determined by powder XRD. LaSn3 crystallizes in the cubic space group Pm3m with Z = 1 (Cu3Au-type structure). The structure is an ordered network of [Sn6] octahedra connected via common vertices. La 2 Sn 3 crystallizes in the orthorhombic space group Cmmm with Z = 4 (Ce2Sn5-type structure) and La3Sn7 in the orthorhombic space group Cmmm with Z = 2 (Gd3Sn7-type structure). The structures show two-dimensional blocks of corner-sharing [Sn6] octahedra terminated by [Sn5] square pyramids. Isolated Sn zigzag chains are interspersed between these layers. The compounds are further characterized by DFT band structure calculations. -(DUERR, I.; SCHWARZ, M.; ROEHR*, C.; J. Solid State Chem. 184 (2011) 8, 2220-2230, http://dx.

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