Abstract
The three isostructural compounds CsCe3Te8, RbCe3Te8, and KNd3Te8 were synthesized from the reaction of elemental copper and lanthanides in a molten alkali metal/polytelluride flux. They crystallize in the monoclinic space group P21/a (No. 14) with a = 9.057(2) Å, b = 12.996(3) Å, c = 14.840(3) Å, β= 98.74(2)°, V =1726.4(7) Å3, and Z= 4 for CsCe3Te8; a = 9.051(2) Å, b = 12.996(3) Å, c = 14.376(3) Å, β= 98.87(2)°, V = 1670.8(7) Å3, and Z= 4 for RbCe3Te8; and a = 8.956(1) Å, b = 12.836(2) Å, c = 13.856(3) Å, β= 99.42(1)°, V = 1571.3(3) Å3, and Z = 4 for KNd3Te8. The structure of all three compounds can be described as a defect NdTe3 type, consisting of an anionic Ln3Te8 layer that is charge balanced with A+ cations. The anionic layer contains a square Te lattice net with an unprecedented ordered defect pattern site occupancy wave. Variable-temperature electrical conductivity and thermopower measurements are reported.
Original language | English (US) |
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Pages (from-to) | 111-115 |
Number of pages | 5 |
Journal | Journal of Solid State Chemistry |
Volume | 135 |
Issue number | 1 |
DOIs | |
State | Published - Jan 1998 |
Funding
Financial support from the National Science Foundation (Grants DMR-9527347 (M.G.K.) and DMR-9622025 (C.R.K.)) is gratefully acknowledged. M.G.K. is a Henry Dreyfus Teacher—Scholar (1993—1998). This work made use of the SEM and TEM facilities of the Center for Electron Optics at Michigan State University.
Keywords
- Conductivity
- Flux synthesis
- Polytelluride
- Rare earth
- Thermopower
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry