Abstract
The intermetallic phases Al 11Au 6 and AlAu have been synthesized from the elements by a high pressure—high temperature reaction in a modified Belt-type apparatus. Al 11Au 6, previously called Al 2Au, crystallizes cubic, space group Fm3 m, a = 5.9988(3) A ̊ , Z = 2 3 , in a CaF 2-type structure with a partially occupied aluminium site ( wR = 0.011, 55 independent reflections with I > σ( I)). AlAu crystallizes monoclinic, space group P2 1 m , with a = 6.3998(11) A ̊ , b = 3.3286(4) A ̊ , c = 6.3254(8) A ̊ , β = 93.140(9)° and Z = 4 ( wR = 0.057, 631 independent reflections with I > σ( I)). AlAu must be considered as a monoclinic distorted NiAs-type with increased coordination numbers of 8 and 9 for aluminium and gold respectively.
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