The crystal structure of Ga5Pd13 - a low-symmetrical ordering variant of the cubic close sphere packing [German]

摘要

Ga5Pd13 is accessible from the elements in the presence of catalytically active amounts of iodine at 520 degrees C. The phase decomposes at 897 degrees C in a peritectoid reaction. The monoclinic crystal structure was determined from the intensities of an X-ray powder diffractogram and refined by a Rietveld profile fit: C2/m, Z = 2, a = 2425.99(5) pm, b = 405.060(7) pm, c = 544.37(1) pm, beta = 102.690(1)degrees R-p = 0.069. The new structure type is described as an ordering variant of the cubic close sphere packing. The ordering pattern and the distortions in the primary coordination of the atoms reflect the definite impact of the intermetallic bonding interactions on the differentiation of the structure. [References: 17]