Abstract
Plate-like hydrated cerium phosphate, Ce2(PO4)2HPO4 · H2O , ca. 3 μm in diameter, was obtained by the hydrothermal reaction of Ce(SO4)2 in H3PO4 aqueous solution at 150–200°C. Ce2(PO4)2HPO4 · H2O transformed to CeP2O7–CePO4 mixture around 700°C while maintaining the plate-like morphology. Plate-like CePO4 and CeP2 O 7 were also synthesized as single phase by heating plate-like Ce2(PO4)2HPO4 · H2O at 700°C with cerium hydroxide and NH4H2PO4 , respectively. Plate-like cerium phosphates showed excellent comfort, absorption ability of UV-ray and lower oxidation catalytic activity than undoped ceria. The UV-shielding ability was in the order Ce2(PO4)2HPO4 · H2O > CeP2O7 > CeP2O7–CePO4 mixture > CePO4 > K0.8Li0.266Ti1.734O4.
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