Syntheses, structures, and characterization of the two-dimensional tellurides CsCu{sub 2}MTe{sub 4}(M = Nb, Ta)
Journal Article
·
· Journal of Solid State Chemistry
- Northwestern Univ., Evanston, IL (United States); and others
The new compounds CsCu{sub 2}MTe{sub 4}(M=Nb, Ta) have been synthesized at 900{degrees}C through the reaction of Cu and Nb or Ta with a Cs{sub 2}Te{sub 3}/Te melt as a reactive flux. Single-crystal X-ray diffraction measurements show that both compounds crystallize in the space group Pn2{sub 1}a of the orthorhombic system with four formula units in cells of dimensions a - 8.198(2) {Angstrom}, b = 5.988(2) {Angstrom}, c = 20.527(6) {Angstrom}, V = 1007.7(6) {Angstrom}{sup 3} at 113 K for M = Nb, and a = 8.217(5) {Angstrom}, b = 5.992(5) {Angstrom}, c = 20.562(14) {Angstrom}, V = 1012(1) {Angstrom}{sup 3} at 113 K for M = Ta. The two compounds are isostructural. The structure of CsCu{sub 2}NbTe{sub 4} comprises infinite, two-dimensional layers of Cu-and Nb-centered tetrahedra; Cs+ cations separate the layers. Each Cs{sup +} cation is coordinated by nine Te atoms at the corners of a highly distorted tricapped trigonal prism. Both phases are highly resistive.
- OSTI ID:
- 223719
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 121; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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