Abstract
The new compound NaYFPO4 has been synthesized by the hydrothermal method (T=200°C, p=20 bar, τ=300 h). It crystallizes in the monoclinic system (space group C2/m (No. 12)) with the unit cell parameters a=8.944(2) Å, b=6.930(1) Å, c=6.469(1) Å, β=106.11(3)°, Z=4. Its structure has been determined from single-crystal X-ray diffraction data and refined to a conventional RI=0.0244 (wR2=0.0629) for 358 reflections, with Fo>4σ(Fo). The new fluoride phosphate NaYFPO4 has an original structure with its own structure type. The YO6F2 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 YO6F2 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.
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