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Stacher, Matthias
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article
AuNi3Si6 and Au2Ni4Si7: Two New Structure Types Related to the CaF2-Type Structure
Abstract
<p>The two compounds AuNi<sub>3</sub>Si<sub>6</sub> and Au<sub>2</sub>Ni<sub>4</sub>Si<sub>7</sub> were prepared from the elements by arc melting and subsequent annealing at 500 °C. They were investigated by X-ray diffraction (powder and single-crystal methods) and by scanning-electron microscopy which was used for the independent determination of the phase compositions. Both compounds show only minor homogeneity ranges. Single-crystal XRD was used for structure determination. Both title compounds crystallize in new structure types; AuNi<sub>3</sub>Si<sub>6</sub> (Pearson symbol hR30, space group R${3}$m) and Au<sub>2</sub>Ni<sub>4</sub>Si<sub>7</sub> (Pearson symbol mC26, space group C2/m). The new crystal structures are related to that of NiSi<sub>2</sub> (CaF<sub>2</sub>-type); AuNi<sub>3</sub>Si<sub>6</sub> may be derived from this structure by a shear operation, while Au<sub>2</sub>Ni<sub>4</sub>Si<sub>7</sub> may be regarded as intergrowth structure of the CaF<sub>2</sub> and Hg<sub>2</sub>Pt-type.</p>