Hydrothermal Synthesis and Crystal Structure of a New Sodium Yttrium Fluoride Phosphate NaYFPO

The new compound NaYFPO{sub 4} has been synthesized by the hydrothermal method (T=200 C, p=20 bar, {tau}=300 h). It crystallizes in the monoclinic system (space group C2/m (No. 12)) with the unit cell parameters a=8.944(2) {angstrom}, b=6.930(1) {angstrom}, c=6.469(1) {angstrom}, {beta}=106.11(3){de...

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Bibliographic Details
Published in:Journal of solid state chemistry 2001-02, Vol.157 (1)
Main Authors: Zhizhin, M. G., Olenev, A. V., Spiridonov, F. M., Komissarova, L. N., D'yachenko, O. G.
Format: Article
Language:English
Subjects:
ATOMS
CHAINS
CRYSTAL STRUCTURE
EXPERIMENTAL DATA
FLUORIDES
FLUORINE
HARMONIC GENERATION
HYDROTHERMAL SYNTHESIS
INFRARED SPECTRA
LATTICE PARAMETERS
MATERIALS SCIENCE
MONOCLINIC LATTICES
OXYGEN
PHOSPHATES
SODIUM
SODIUM FLUORIDES
SODIUM PHOSPHATES
SPACE GROUPS
X-RAY DIFFRACTION
YTTRIUM FLUORIDES
YTTRIUM PHOSPHATES
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Summary:The new compound NaYFPO{sub 4} has been synthesized by the hydrothermal method (T=200 C, p=20 bar, {tau}=300 h). It crystallizes in the monoclinic system (space group C2/m (No. 12)) with the unit cell parameters a=8.944(2) {angstrom}, b=6.930(1) {angstrom}, c=6.469(1) {angstrom}, {beta}=106.11(3){degree}, Z=4. Its structure has been determined from single-crystal X-ray diffraction data and refined to a conventional R{sub I}=0.0244 (wR{sub 2}=0.0629) for 358 reflections, with F{sub o}>4{sigma}(F{sub o}). The new fluoride phosphate NaYFPO{sub 4} has an original structure with its own structure type. The YO{sub 6}F{sub 2} polyhedra form infinite chains along [010] by sharing two oxygen atoms, which is the unique crystallographic feature of this fluoride phosphated compound. The chains are further linked by the fluorine edges of the YO{sub 6}F{sub 2} polyhedra in such a way that, within each chain, the polyhedra alternately have common fluorine atoms with the neighboring chains to their left and right.
ISSN:0022-4596
1095-726X
DOI:10.1006/jssc.2000.9015