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The new mixed rare earth (RE) orthophosphates Y 0.5 Er 0.5 PO 4  and Y 0.5 Yb 0.5 PO 4  were synthesized by a classical solid state reaction in an electrical furnace at 1200 °C. As starting materials, the corresponding rare earth oxides and diammonium hydrogen phosphate were used. The powder diffraction analyses revealed that the new compounds Y 0.5 Er 0.5 PO 4  and Y 0.5 Yb 0.5 PO 4  crystallize in a zircon-type structure being isostructural with the rare earth orthophosphate YPO 4 . Y 0.5 Er 0.5 PO 4  and Y 0.5 Yb 0.5 PO 4  crystallize in the tetragonal space group  I 4 1 / amd  (no. 141) with four formula units in the unit cell. The structural parameters based on Rietveld refinements are  a  = 687.27(2),  c  = 601.50(2) pm,  V  = 0.28412(1) nm 3 ,  R  p = 0.0143, and  R  wp  = 0.0186 (all data) for Y 0.5 Er 0.5 PO 4  and  a  = 684.61(2),  c  = 599.31(2) pm,  V  = 0.28089(2) nm 3 ,  R  p  = 0.0242, and  R  wp  = 0.0313 (all data) for Y 0.5 Yb 0.5 PO 4 . Furthermore, the structure of Y 0.5 Er 0.5 PO 4  was refined from single-crystal X-ray diffraction data:  a  = 687.78(5),  c  = 601.85(4) pm,  V  = 0.28470(5) nm 3 ,  R  1 = 0.0165, and  wR  2  = 0.0385 (all data). In both compounds, the rare earth metal ions are eightfold coordinated by oxygen atoms, forming two unique interlocking tetrahedra with two individual  RE –O distances. The tetrahedral phosphate groups [PO 4 ] 3–  are slightly distorted in both compounds. The individual rare earth ions share a common position (Wyckoff site 4 a ). The presence of two rare earth ions in the structures of the new orthophosphates Y 0.5 Er 0.5 PO 4  and Y 0.5 Yb 0.5 PO 4  was additionally confirmed by single-crystal EDX spectroscopy revealing a ratio of 1:1.

Synthesis and characterization of the novel rare earth orthophosphates Y 0.5 Er 0.5 PO 4 and Y 0.5 Yb 0.5 PO 4