Abstract
Abstract Two new phases were identified in the copperrich region of the Ce–Cu–Sn system with composition CeCu5Sn and Ce2Cu9Sn2.65 and their crystal structures were determined by single crystal diffractometric data. CeCu5Sn, orthorhombic, space group Pnma, Pearson symbol oP28, a = 8.323(1) Å, b = 5.064(1) Å, c = 10.597(1) Å, Z = 4, R = 0.042 for 352 reflections with Fo > 4σ(Fo), is isotypic with CeCu5Au, a ternary derivative of the CeCu6, structure. Ce2Cu9Sn2.65, orthorhombic, space group Pnnm, Pearson symbol oP56-1.4, a = 10.669(1) Å, b = 16.734(2) Å, c = 5.066(1) Å, Z = 4, R = 0.040 for 906 reflections with Fo > 4σ(Fo), can be derived from the Ce2Cu9In3 type. Different from the parent structure, the copper and tin atoms occupy all the atomic sites in an ordered way, but a Sn position is only partially filled. The crystal structures of CeCu5Sn and Ce2Cu9Sn2.65 are closely related and show very similar coordination polyhedra. Isotypic phases were found in the series RCu5Sn with R = La, Pr, Nd, Sm, Gd. The crystal structure of the already known Ce3Cu4Sn4 (Gd3Cu4Ge4-type) was also refined from single crystal data.
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