Two new binary lanthanide polytellurides: Syntheses and crystal structures of CeTe{sub 1.90} and SmTe{sub 1.80}
Journal Article
·
· Journal of Solid State Chemistry
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208-3113 (United States)
Single crystals of the new binaries CeTe{sub 1.90} and SmTe{sub 1.80} have been obtained. CeTe{sub 1.90} was synthesized at 1023K from the reaction of Ce, TeO{sub 2}, and Te with the use of a CsCl flux. It crystallizes in the tetragonal space group P4{sub 2}/n with 20 formula units in a cell of dimensions at 153K of a=10.0261(5), c=18.1336(12)A, V=1822.84(18)A{sup 3}. It is isostructural with the LnSe{sub 1.9} polyselenides (Ln=La, Ce, Pr) and with SmS{sub 1.90}. SmTe{sub 1.80} was synthesized at 1223K from the reaction of Sm and Te in a KBr flux. SmTe{sub 1.80} crystallizes in a new structural type in the tetragonal space group P4/n with 20 formula units in a cell of dimensions at 153K of a=9.7026(4), c=18.0072(14)A, V=1695.21(14)A{sup 3}. 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)A in CeTe{sub 1.90} and 2.878(1), 2.9932(3), and 3.2114(7)A in SmTe{sub 1.80}. 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.
- OSTI ID:
- 20900886
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 11 Vol. 179; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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