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Spherical aggregates of leaf-like YPO4 particles have been prepared by the reactions of tri-n-butylphosphate [PO(OC4H9)3, TBP] with the acidic Y(NO3)3 aqueous solution in an autoclave at 180°C. The products of the reactions for 1, 3 and 6h consisted of an intermediate exhibiting an intense X-ray diffraction line at d μ 1.28 nm, while those of reactions for 12­48h were pure YPO4. The products of the reactions for 8 and 8.5 h were mixtures of the intermediate and YPO4. YPO4 formation thus seems to proceed via the formation of the intermediate. Since the intermediate seems to be Y[PO2(OC4H9)2]3, it is likely that TBP was hydrolyzed to form PO2(OC4H9)2 ions, which then reacted with Y3+ ions to form the solid intermediate, Y[PO2(OC4H9)2]3. Scanning electron microscopy (SEM) revealed the corresponding morphological change from the belt-like products to spherical aggregates of leaflike particles, indicating that the solid intermediate Y[PO2(OC4H9)2]3 was hydrolyzed to form leaf-like YPO4 particles. ©2012 The Ceramic Society of Japan. All rights reserved.

Synthesis of spherical aggregates of leaf-like YPO<sub>4</sub> particles via hydrolysis of tri-<i>n</i>-butylphosphate