Abstract
The metal-rich indide La 18 Co 28 In 3 was synthesized by melting of the elements in a high-frequency furnace and characterized by X-ray diffraction on powders and single crystals. This high-temperature phase crystallizes with a new structure type: I4/mmm, a = 1432.56(8), c = 984.35(6) pm, wR2 = 0.1054, 1027 F 2 values, 43 variables at 295 K. The structure is built up by a complex three-dimensional network of Co 4 tetrahedra which are condensed via further cobalt atoms with a broad range of Co-Co distances (242-262 pm). This network leaves larger channels which are filled by the lanthanum and indium centered polyhedra. The two crystallographically independent indium atoms have exclusively lanthanum neighbors within the channels. They form infinite (In1-In2-In2) chains along c with In1-In2 and In2-In2 distances of 332 and 319 pm, respectively. These chains are only weakly bonded to their lanthanum neighbors with La-In distances ranging from 344 to 368 pm. Both indium sites show enhanced displacements along the c axis. Temperature dependent diffraction studies and similarities to the incommensurate La 1.18 Rh 3 In 2 structure are discussed.
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