HYDROTHERMAL SYNTHESIS OF XENOTIME FINE CRYSTALS

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Xenotime (YPO₄) fine crystals were synthesized hydrothermally at 150 °C under the saturated vapor pressure of acidic aqueous solution for 3h. The crystals were nonaggregated particles with polyhedral shape of about 30nm in size when phosphoric acid was used for solvent. The rod like particles of about 200 nm in length were obtained when hydrochloric acid was used for solvent. The lattice parameters of xenotime prepared hydrothermally were in good agreement with those of pure YPO₄.