Synthesis of monodispersed LaPO4 particles using the hydrothermal reaction of an La(edta)- chelate precursor and phosphate ions

Yoshinobu Fujishiro, Hisayoshi Ito, Tsugio Sato, Akitugu Okuwaki

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48 Citations (Scopus)


Homogeneous precipitation of LaPO4 was carried out using the hydrothermal reaction of lanthanum(III) ethylenediamine tetraacetate complex (La(edta) ) and phosphate ion in order to prepare directly monodispersed crystalline LaPO4 particles. Monodispersed monazite-type LaPO4 precipitated under conditions of 0.008 M La3+, [edta]/[La]≥2 and [PO4]/[edta] = 0.6 to 1 at 150 °C for 2 h. The particle consisted of fine crystals ca. 20 nm in length. The spherical particle of 0.3 μm diameter precipitated at pH 3, and the spindle-like particle precipitated with decreasing [edta]/[L3+] molar ratio or increasing pH to 7. The monodispersed particle may be formed by control of the precipitation rate, depending on the stability of the La(edta)- chelate precursor determined by [edta]/[PO4] and pH.

Original languageEnglish
Pages (from-to)103-109
Number of pages7
JournalJournal of Alloys and Compounds
Issue number1-2
Publication statusPublished - 1997 May 5


  • Homogeneous precipitation
  • Hydrothermal
  • Metal chelate precursor
  • Monodispersed particles

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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