High-pressure synthesis of rare-earth metal disulfidesand diselenides LnX2 (Ln = Sm, Gd, Tb, Dy, Ho, Er and Tm; X = S, Se)

Carola J. Müller; Thomas Doert; Ulrich Schwarz

doi:10.1524/zkri.2011.1386

Published by De Gruyter (O) May 3, 2011

High-pressure synthesis of rare-earth metal disulfidesand diselenides LnX₂ (Ln = Sm, Gd, Tb, Dy, Ho, Er and Tm; X = S, Se)

Carola J. Müller, Thomas Doert and Ulrich Schwarz

From the journal Zeitschrift für Kristallographie

https://doi.org/10.1524/zkri.2011.1386

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Abstract

A series of rare-earth metal disulfides LnS₂ and diselenides LnSe₂ (Ln = Sm, Gd, Tb, Dy, Ho, Er and Tm has been prepared by high-pressure high-temperature synthesis at 8(1) GPa. The dichalcogenides LnX₂ (X = S, Se) are found to crystallize in the α-LaS₂ type with the monoclinic space group P12₁/a1 (no. 14). The crystal structure is a twofold superstructure of the ZrSSi aristotype and consists of puckered cationic [LnX]⁺ double slabs which are sandwiched by planar chalcogen sheets containing X₂^2– dumbbells.

Keywords: Rare-earth element; Dichalcogenides; High-pressure synthesis; X-ray diffraction

^* Correspondence address: Technische Universität Dresden, Fachrichtung Chemie und Lebensmittelchemie, Helmholtzstr. 10, 01069 Dresden, Deutschland, thomas.doert@chemie.tu-dresden.de

Published Online: 2011-05-03

Published in Print: 2011-08

High-pressure synthesis of rare-earth metal disulfidesand diselenides LnX₂ (Ln = Sm, Gd, Tb, Dy, Ho, Er and Tm; X = S, Se)

Abstract

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