Two new cerium(IV) phosphates were obtained: cerium(IV) hydroxidophosphate, Ce(OH)PO4, and cerium(IV) oxidophosphate, Ce2O(PO4)2, which were shown to complement the classes of isostructural compounds M(OH)PO4 and R2O(PO4)2, where M=Th, U and R=Th, U, Np, Zr. Ce2O(PO4)2 oxidophosphate is formed by elimination of H2O from the crystal structure of Ce(OH)PO4 during its thermal decomposition. The structures of Ce(OH)PO4 and Ce2O(PO4)2 are related to each other with the same Cmce space group and similar unit cell parameters (a=6.9691(3) Å, b=9.0655(4) Å, c=12.2214(4) Å, V=772.13(8) Å3, Z=8; a=7.0220(4) Å, b=8.9894(5) Å, c=12.544(1) Å, V=791.8(1) Å3, Z=4, respectively).
Cerium(IV) hydrogen phosphate Ce(PO 4 )(HPO 4 ) 0.5 (H 2 O) 0.5 has been prepared by hydrothermal treatment of gels obtained by hydrolysis of cerium-containing phosphoric acid solutions. The obtained compound and the products of its heating in a wide temperature range have been analyzed by X-ray powder diffraction analysis, IR spectroscopy, mass spectrometry of gaseous thermolysis products, and scanning electron microscopy. Thermal decomposition of the compound at temperature up to 1200°С has been refined. In particular, it has been shown that crystalline cerium(III) phosphate (CePO 4 ) forms upon heating of Ce(PO 4 )(HPO 4 ) 0.5 (H 2 O) 0.5 in air even at 600°C.
Two previously unknown cerium(IV) phosphates, cerium(IV) hydroxidophosphate, Ce(OH)PO4, and cerium(IV) oxidophosphate, Ce2O(PO4)2, have been discovered. These sister compounds with similar structures belong to a very limited family of ceric salts and complement the classes of isostructural M(OH)PO4 and R2O(PO4)2 (M=Th, U and R=Th, U, Np, Zr). More information can be found in the Full Paper by V. K. Ivanov et al. on page 12188.
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