Structure Determination and Physical Properties of the Misfit Layered Compound (Pb2FeS3)0.58NbS2

✍ Scribed by A. Lafond; C. Deudon; A. Meerschaut; P. Palvadeau; Y. Moëlo; A. Briggs

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 210 KB
• Volume: 142
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1998.8068

✦ Synopsis

A crystal structure study of the layered misfit compound (Pb 2 FeS 3 ) 0.58 NbS 2 has been performed using the composite approach. The structure can be described on the basis of a regular alternation of [Pb 2 FeS 3 ] and [NbS 2 ] slabs stacked along the c direction. The [Pb 2 FeS 3 ] part has a thickness of three layers, the central "FeS" layer being sandwiched between the two external "PbS" layers. Thus, Pb atoms on the exterior sides of this part are in a squared-pyramidal sulfur coordination, while Fe atoms in the central zone are octahedrally and tetrahedrally surrounded by sulfur atoms. From bond valence calculations, Fe atoms are found in the ؉III oxidation state whatever their environment. This is corroborated by a Mo¨ssbauer study. Magnetic and electrical properties complete this study.