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Crystal structure of the metal-rich phosphide Sm~15~Ir~33~P~26~ by Ulrike Pfannenschmidt; Ute Ch. Rodewald; Rainer Pöttgen is a Materials Science article available to read on EtoBox.

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## Abstract The new metal-rich phosphide Sm~15~Ir~33~P~26~ was obtained from a reaction of the elements in a lead flux (1 : 2 : 2 : 30 molar ratio, 1370 K, slow cooling rate). Sm~15~Ir~33~P~26~ adopts a new structure type which was characterized by powder and single crystal X-ray data: __C__2/__m__, __a__ = 4720.6(8), __b__ = 392.87(9), __c__ = 1329.2(2) pm, __β__ = 95.478(1)°, __wR__2 = 0.0376, 3757 __F__ ^2^ values and 227 variables. The iridium and phosphorus atoms build up a complex three-dimensional [Ir~33~P~26~]^__δ__–^ polyanionic network in which the samarium atoms fill diverse larger cavities with coordination numbers of 15–17. The seventeen crystallographically independent iridium atoms have between 3 or 4 phosphorus neighbors in distorted trigonal-, square-planar, or tetrahedral coordination. All phosphorus atoms are isolated and most of them fill tri-capped trigonal prisms. The Sm~15~Ir~33~P~26~ structure is an intergrowth variant of ThCr~2~Si~2~, SrPtSb, CeMg~2~Si~2~, and TiNiSi-related slabs.

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Author

Ulrike Pfannenschmidt; Ute Ch. Rodewald; Rainer Pöttgen

Publisher

Walter de Gruyter GmbH

Published

2010

Language

EN

Field

Materials Science (Physical Sciences)