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The Structure of La3Au4In7 and its Relation to the BaAl4 Type

✍ Scribed by Yaroslav V. Galadzhun; Vasyl' I. Zaremba; Yaroslav M. Kalychak; Rolf-Dieter Hoffmann; Rainer Pöttgen

Publisher
John Wiley and Sons
Year
2000
Tongue
German
Weight
140 KB
Volume
626
Category
Article
ISSN
0372-7874

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✦ Synopsis

La 3 Au 4 In 7 was prepared by arc-melting of the elements and subsequent annealing at 970 K. X-ray diffraction of powders and single crystals yielded I2/m11, mI28, a = 460.42(5) pm, b = 1389.5(1) pm, c = 1039.6(2) pm, a = 90.77(1)°, wR2 = 0.0621, 1089 F 2 values, 46 variables. The structure of La 3 Au 4 In 7 is of a new type. It may be considered as a monoclinically distorted, ordered variant of the La 3 Al 11 type. The structural relation with the family of BaAl 4 related compounds is discussed on the basis of a group-subgroup scheme. The gold and indium atoms in La 3 Au 4 In 7 build a three-dimensional [Au 4 In 7 ] polyanion in which the lanthanum atoms fill distorted pentagonal and hexagonal channels. Within the polyanion short Au±In and In±In distances are indicative of strongly bonding Au±In and In±In interactions.

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