Crystal Structure, Specific Heat, and119Sn Mössbauer Spectroscopy of CeRu4Sn6: A Ternary Stannide with Condensed, Distorted RuSn6Octahedra
✍ Scribed by R. Pöttgen; R.-D. Hoffmann; E.V. Sampathkumaran; I. Das; B.D. Mosel; R. Müllmann
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 463 KB
- Volume
- 134
- Category
- Article
- ISSN
- 0022-4596
No coin nor oath required. For personal study only.
✦ Synopsis
CeRu 4 Sn 6 was prepared from the elements by a reaction in an arc-melting furnace and subsequent annealing at 1123 K. It crystallizes with the tetragonal YRu 4 Sn 6 type structure of space group I4 2m: a,)1(1.886؍ c)2(2.579؍ pm, V)1(7164.0؍ nm 3 , wR2,2740.0؍ 554 F 2 values, and 19 variables. The cerium atoms in CeRu 4 Sn 6 have coordination number 16 formed by 12 tin and 4 ruthenium atoms. These polyhedra are arranged in a tetragonal body-centered packing and are linked by common Sn1 atoms. The strongest bonding interactions are between ruthenium and tin atoms. The ruthenium atoms have 6 tin neighbors at distances from 256.9 to 276.8 pm in the form of a strongly distorted octahedron. Four of such octahedra are condensed via common edges and faces forming [Ru 4 Sn 6 ] units. These groups are packed in a tetragonal body-centered arrangement. The cerium atoms occupy the space between the [Ru 4 Sn 6 ] units. The [Ru 4 Sn 6 ] substructure of CeRu 4 Sn 6 is discussed in comparison with the structures of Ru 2 Sn 3 , LaRuSn 3 , and Ru 3 Sn 15 O 14 which also contain condensed RuSn 6 octahedra or trigonal prisms as characteristic structural motifs. Despite the two different tin sites the 119 Sn Mo¨ssbauer spectroscopic measurements show only one signal at 99.1؍ mm/s subjected to quadrupole splitting. Heat capacity measurements indicate that CeRu 4 Sn 6 behaves like a heavy-fermion compound.