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| ig h P re ssu re S y n th esis a n d S in g le-C ry stal S tru c tu re R e fin e m e n t o f C alciu m A u ra te (I II) , C a A u 20 4 A n ja L o u zik o v a, K la u s-Jü rg e Single crystals of calcium aurate(III), CaAu20 4, were obtained by high-pressure treatment of a C a0/A u20 3/K 0 2 mixture at 40 kbar, 1200 °C in a modified Belt-type apparatus. The crystals are tetragonal, space group 14j/a, with a = 5.9868(7), c = 10.043(1) A, c/a = 1.678 and Z = 4. CaAu20 4 is isostructural with LaPd20 4, SrAu20 4 and BaAu20 4. Its structure comprises square-planar A u 0 4 groups (< A u -0 > = 2.007 A), which are stacked into columns along [100] and [010], These columns are connected by shared corners forming a three-dimensional framework. The Ca ions are situated in tunnels created by the gold-oxygen partial structure. They are surroun ded by eight oxygen atoms (< C a -0 > = 2.490 A) in a slightly distorted dodecahedron. | | | |
Reference
| Z. Naturforsch. 51b, 747—750 (1996); eingegangen am 14. November 1995 | | | |
Published
| 1996 | | | |
Keywords
| Calcium Aurate(III), High-Pressure Synthesis, Crystal Structure | | | |
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