Structure and luminescence of some CsLnW/sub 2/O/sub 8/ compounds
The structure of CsLuW/sub 2/O/sub 9/ was determined from single-crystal X-ray diffraction data with a = 9.322(3), b = 5.132(6), c = 7.277(4) A, and ..beta.. = 95.66(4)/sup 0/, in the space group P2/c. It is composed of double chains of distorted WO/sub 6/ octahedra that share an edge across the chain and share opposite corners along the chain in the c direction. The tungsten-oxygen chains are interconnected via the lutetium and cesium atoms which are in eight- and twelve-coordination with oxygen. A comparison with the related structure of KYW/sub 2/O/sub 8/ is made. The compounds CsLnW/sub 2/O/sub 8/ (Ln = Y, Gd) have a similar structure. The three tungstates (Ln = Y, Gd, Lu) exhibit an intense luminescence at room temperature, whereas KYW/sub 2/O/sub 9/ does not luminesce at all. The luminescence of the compounds with Ln = Eu, Tb are also reported.
- Research Organization:
- E.I. du Pont de Nemours and Co., Wilmington, DE
- OSTI ID:
- 6225370
- Journal Information:
- J. Solid State Chem.; (United States), Journal Name: J. Solid State Chem.; (United States) Journal Issue: 1 Vol. 69:1; ISSN JSSCB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
BOND LENGTHS
CESIUM COMPOUNDS
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
DATA
DIFFRACTION
DIMENSIONS
EMISSION SPECTROSCOPY
EXPERIMENTAL DATA
GADOLINIUM COMPOUNDS
INFORMATION
LATTICE PARAMETERS
LENGTH
LUMINESCENCE
LUTETIUM COMPOUNDS
MONOCLINIC LATTICES
MONOCRYSTALS
NUMERICAL DATA
RARE EARTH COMPOUNDS
SCATTERING
SPACE GROUPS
SPECTRA
SPECTROSCOPY
STRUCTURAL CHEMICAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
TUNGSTATES
VISIBLE SPECTRA
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM TUNGSTATES