Single-crystal analysis of mixed ( Ln/TbPO 4) orthophosphates

Structural investigations of the mixed lanthanide orthophosphates have been carried out by means of three-dimensional single-crystal X-ray diffractometry. Each mixed orthophosphate compound crystallized in the tetragonal space group I4 1amd ( D 19 4h , No. 141) ( Z = 4) with lattice constants of a =...

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Bibliographic Details
Published in:Journal of solid state chemistry 1992-08, Vol.99 (2), p.313-318
Main Authors: Mullica, D.F., Sappenfield, E.L., Boatner, L.A.
Format: Article
Language:English
Subjects:
360602 - Other Materials- Structure & Phase Studies
CHEMICAL ANALYSIS
COHERENT SCATTERING
Condensed matter: structure, mechanical and thermal properties
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DIFFRACTION
Exact sciences and technology
EXPERIMENTAL DATA
GADOLINIUM COMPOUNDS
GADOLINIUM PHOSPHATES
INFORMATION
Inorganic compounds
LATTICE PARAMETERS
LUTETIUM COMPOUNDS
LUTETIUM PHOSPHATES
MATERIALS SCIENCE
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
Physics
RARE EARTH COMPOUNDS
Salts
SCATTERING
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
TERBIUM PHOSPHATES
TETRAGONAL LATTICES
X-RAY DIFFRACTION
X-RAY EMISSION ANALYSIS
X-RAY FLUORESCENCE ANALYSIS
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Summary:Structural investigations of the mixed lanthanide orthophosphates have been carried out by means of three-dimensional single-crystal X-ray diffractometry. Each mixed orthophosphate compound crystallized in the tetragonal space group I4 1amd ( D 19 4h , No. 141) ( Z = 4) with lattice constants of a = 6.9449(9), 6.9647(7), 6.8003(8) and c = 6.0680(18), 6.0900(6), 5.9638(6) for 1:1(Gd/Tb)PO 4, 3:1(Gd/Tb)PO 4, and 9:1(Lu/Tb)PO 4, respectively. The final least-squares full-matrix refinements, based on 313, 310, and 283 unique reflections, yielded R-values equal to 0.023, 0.017, and 0.030, respectively. The lanthanide ions are eight-coordinated to oxygen atoms, and the resulting polyhedra are best described as two orthogonal interpenetrating tetrahedra, bis-bisphenoidal ( D 2d ) geometry. Important bond distances and angles, crystal data and parameters, as well as optical and X-ray fluorescence analyses are presented.
ISSN:0022-4596
1095-726X
DOI:10.1016/0022-4596(92)90319-Q