New complex ytterbium molybdophosphates M
2
I
Yb(PO4)(MoO4) (MI = K, Na): Synthesis and structure solution |
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| Authors: | L N Komissarova M A Ryumin A P Bobylev M G Zhizhin V P Danilov |
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| Institution: | (1) Moscow State University, Vorob’evy gory, Moscow, 119992, Russia;(2) Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Leninskii pr. 31, Moscow, 119991, Russia |
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| Abstract: | Complex rare-earth molybdophosphates of sodium and potassium (Na2Yb(PO4)(MoO4) (I) and K2Yb(PO4)(MoO4) (II) are synthesized by solid-phase reactions at 600°C (for I) and 750°C (for II). The molybdophosphates are characterized using powder X-ray diffraction, laser second harmonic generation (SHG), IR spectroscopy, and differential thermal analysis. Their structures are refined using the Rietveld technique. The compounds are isostructural and crystallize in an orthorhombic system (space group Ibca, Z = 8). The unit cell parameters are a = 18.0086(1) Å, b = 12.0266(1) Å, c = 6.7742(1) Å for compound I and a = 19.6646(1) Å, b = 12.0570(1) Å, c = 6.8029(1) Å for compound II. The structures are built of YbO8 chains extended along axis c and linked into layers through PO4 tetrahedra. The Na+ cations (CN = 6) and the K+ cations (CN = 8) reside in the interlayer spaces. |
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