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Z. Naturforsch. 2014, 69b, 369 – 372
doi:10.5560/ZNB.2014-3295
The New Ternary Silicide ErCo3Si2
Mariya Dzevenko and Inna Bigun
Department of Analytical Chemistry, Ivan Franko National University of Lviv, Kyryla and Mefodia Str. 6, 79005 Lviv, Ukraine
Reprint requests to M. Dzevenko. E-mail: mashadzev@gmail.com
Received October 22, 2013 / published online March 17, 2014
The new ternary silicide ErCo3Si2 adopts the ErRh3Si2 structure type (space group Imma, Pearson code oI24, Z = 4, a = 6.950(1), b = 9.020(2), c = 5.230(1) Å, R1 = 0.0565, wR2 = 0.0355, 253 F2 values, 23 variables). It is a deformation derivative of the CeCo3B2 structure type. The coordination of the Er atom shows a normal 20-vertex polyhedron [Er(Si6Co12Er2)]. The two similar coordination polyhedra of Co are a distorted icosahedron [Co(Si4Co4Er4)], and a distorted icosahedron with one capped face [Co(Si4Co5Er4)]. The Si atom is surrounded by the polyhedron [Si(Co6Si2Er3)].
Key words: Erbium, Cobalt, Silicon, Crystal Structure
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