TY - JOUR
T1 - Site occupancy wave and unprecedented infinite zigzag (Te2-2)n chains in the flat Te nets of the new ternary rare earth telluride family ALn3Te8
AU - Patschke, Rhonda
AU - Heising, Joy
AU - Schindler, Jon
AU - Kannewurf, Carl R.
AU - Kanatzidis, Mercouri
N1 - Funding Information:
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.
PY - 1998/1
Y1 - 1998/1
N2 - 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.
AB - 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.
KW - Conductivity
KW - Flux synthesis
KW - Polytelluride
KW - Rare earth
KW - Thermopower
UR - http://www.scopus.com/inward/record.url?scp=0000458653&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0000458653&partnerID=8YFLogxK
U2 - 10.1006/jssc.1997.7606
DO - 10.1006/jssc.1997.7606
M3 - Article
AN - SCOPUS:0000458653
SN - 0022-4596
VL - 135
SP - 111
EP - 115
JO - Journal of Solid State Chemistry
JF - Journal of Solid State Chemistry
IS - 1
ER -