New Complex Ytterbium Molybdophosphates
Yb(PO₄)(MoO₄) (M^I = K, Na):
Synthesis and Structure Solution

L. N. Komissarova^a, M. A. Ryumin^a,b, A. P. Bobylev^a,
M. G. Zhizhin^a, and V. P. Danilov^b

^aMoscow State University, Vorob’evy gory, Moscow, 119992 Russia

^bKurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia

Received July 21, 2005

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 tech-
nique. 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⁺ cat-
ions (CN = 8) reside in the interlayer spaces.

Pleiades Publishing home page | journal home page | top

If you have any problems with this server, contact webmaster.