Two new binary lanthanide polytellurides: Syntheses and crystal structures of CeTe1.90 and SmTe1.80

Ismail Ijjaali, James A Ibers*

*Corresponding author for this work

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

Single crystals of the new binaries CeTe1.90 and SmTe1.80 have been obtained. CeTe1.90 was synthesized at 1023 K from the reaction of Ce, TeO2, and Te with the use of a CsCl flux. It crystallizes in the tetragonal space group P42/n with 20 formula units in a cell of dimensions at 153 K of a = 10.0261 (5), c = 18.1336 (12) Å, V = 1822.84 (18) Å3. It is isostructural with the LnSe1.9 polyselenides (Ln=La, Ce, Pr) and with SmS1.90. SmTe1.80 was synthesized at 1223 K from the reaction of Sm and Te in a KBr flux. SmTe1.80 crystallizes in a new structural type in the tetragonal space group P4/n with 20 formula units in a cell of dimensions at 153 K of a = 9.7026 (4), c = 18.0072 (14) Å, V = 1695.21 (14) Å3. Both of these layered structures, which may be derived from the ZrSiS structure type, consist of double layers of [LnTe] polyhedra separated by planar Te nets that contain vacancies. In these nets the shortest Te-Te distances are 2.9194(5), 3.1204(5), and 3.3324(6) Å in CeTe1.90 and 2.878(1), 2.9932(3), and 3.2114(7) Å in SmTe1.80. Neither a simple delineation of the Te-Te bonding nor an assignment of individual formal oxidation states is possible in either of these compounds if one takes strict account of the Te-Te distances.

Original languageEnglish (US)
Pages (from-to)3456-3460
Number of pages5
JournalJournal of Solid State Chemistry
Volume179
Issue number11
DOIs
StatePublished - Nov 1 2006

Keywords

  • Binary lanthanide polytelluride
  • Crystal structure
  • Hypostoichiometry
  • Synthesis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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