Abstract
The new compounds Ln7VO4Se8 (Ln = Nd, Sm, Gd) were each prepared by heating V, Se, and the corresponding rare-earth sesquioxide at 1223 K in a sealed fused-silica tube. Single crystals have been grown through the use of an antimony flux. They have been characterized by single-crystal and powder X-ray diffraction measurements and by energy dispersive X-ray analysis. These isostructural compounds crystallize with two formula units in the orthorhombic space group Pbam in cells (at 153 K) of dimensions: Nd7VO4Se8, a = 14.3419(9) Å, b = 15.5528(10) Å, c = 3.9948(3) Å; Sm7VO4Se8, a = 14.200(2) Å, b = 15.451(2) Å, c = 3.9511(6) Å; Gd7VO4Se8, a = 14.075(8) Å, b = 15.424(6) Å, c = 3.903(1) Å. The new structure type comprises four crystallographically independent Ln atoms with three different coordination geometries and one V atom in an octahedral environment. Magnetic measurements reveal that Gd7VO4Se8 is paramagnetic down to 5 K. (C) 2000 Academic Press.
Original language | English (US) |
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Pages (from-to) | 564-568 |
Number of pages | 5 |
Journal | Journal of Solid State Chemistry |
Volume | 154 |
Issue number | 2 |
DOIs | |
State | Published - 2000 |
Funding
This research was supported by the U.S. National Science Foundation under Grant DMR 97-09351. This work made use of facilities supported by the MRSEC program of the National Science Foundation (DMR96-32472) at the Materials Research Center of Northwestern University.
Keywords
- Gadolinium
- Magnetism
- Neodymium
- Oxychalcogenide
- Samarium
- X-ray structure
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Condensed Matter Physics
- Physical and Theoretical Chemistry
- Inorganic Chemistry
- Materials Chemistry