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A New Structure Type of the Ternary Sulfide Eu1.3Nb1.9S5

✍ Scribed by N.R. Khasanova; G. Van Tendeloo; O.I. Lebedev; S. Amelinckx; A.Yu. Grippa; A.M. Abakumov; S.Ya. Istomin; O.G. D'yachenko; E.V. Antipov

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
689 KB
Volume
164
Category
Article
ISSN
0022-4596

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✦ Synopsis

The structure model for the Eu 1.3 Nb 1.9 S 5 compound is determined based on high-resolution electron microscopy evidence. This compound crystallizes in a hexagonal unit cell with a=8.8732(8) A ˚and c=23.45(1) A ˚. Its structure is built up as an alternating sequence of trigonal-prismatic NbS 2 layers of formula [Nb 7 S 14 ] and [Nb(Eu 3 S 4 ) 2 ] slabs along the c-direction.

In the [Nb(Eu 3 S 4 ) 2 ] block the stacking of two close-packed (Eu 3 S 4 ) layers creates octahedral interstices formed by S atoms; these cavities are occupied by Nb cations. The model is compared with structures of other Eu-containing niobium sulfides, such as Eu 0.167 NbS 2 and the misfit compound [(EuS) 1.5 ] 1.15 NbS 2 .

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