ThSi2 Type Ytterbium Disilicide and its Analogues YbTxSi2–x (T = Cr,Fe, Co) |
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Authors: | Sebastian C Peter Prof Dr Mercouri G Kanatzidis |
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Institution: | 1. Department of Chemistry, Northwestern University, 2145 N. Sheridan Road, Evanston, IL 60208–3113, USA;2. New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore 560064, India |
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Abstract: | YbSi2 and the derivatives YbTxSi2–x (T = Cr, Fe, Co) crystallizing in the α‐ThSi2 structure type were obtained as single crystals from reactions run in liquid indium. All silicides were investigated by single‐crystal X‐ray diffraction, I41/amd space group and the lattice constants are: a = 3.9868(6) Å and c = 13.541(3) Å for YbSi2, a = 4.0123(6) Å and c = 13.542(3) Å for YbCr0.27Si1.73, a = 4.0142(6) Å and c = 13.830(3) Å for YbCr0.71Si1.29, a = 4.0080(6) Å and c = 13.751(3) Å for YbFe0.34Si1.66, and a = 4.0036(6) Å, c = 13.707(3) Å for YbCo0.21Si1.79. YbSi2 and YbTxSi2–x compounds are polar intermetallics with three‐dimensional Si and M (T+Si) polyanion sub‐networks, respectively, filled with ytterbium atoms. The degree of substitution of transition metal at the silicon site is signficant and leads to changes in the average bond lengths and bond angles substantially. |
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Keywords: | Intermetallics Metal flux synthesis Ytterbium Crystal growth |
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