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Journal of Materials Science

, Volume 38, Issue 2, pp 229–233 | Cite as

Preparation of lanthanide orthophosphates by crystallisation from phosphoric acid solution

  • R. Kijkowska
Article

Abstract

Highly crystalline solids of the composition of LnPO4 · nH2O (Ln = La, Ce, Pr, Nd. Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu and Y) were prepared by crystallisation from boiling phosphoric acid solution with the initial concentration 2 M/1 of H3PO4 and 0.02 M/1 of Ln. The number of molecules of water (n) was close to 1. The crystallisation process was completed within two hours. Scanning electron micrographs showed that the diameter of the LnPO4 · H2O crystalline particles was increasing within the group of elements from below 1 μm (LaPO4 · H2O) to above 5 μm (TmPO4 · H2O). Such large crystals of lanthanide phosphates cannot be obtained by usually applied precipitation methods. The light lanthanides (La → Sm) formed clusters of shapeless particles with the tendency to form ‘rod-like’ crystals. The heavy lanthanides (Ho → Lu, and YPO4 · H2O) consisted of spherical globules. The TbPO4 · H2O and DyPO4 · H2O, formed a mixture of the spherical and rod-like crystals.

Keywords

Phosphoric Acid Electron Micrographs H3PO4 Crystallisation Process Scan Electron Micrographs 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • R. Kijkowska
    • 1
  1. 1.Institute of Inorganic Chemistry and TechnologyCracow University of TechnologyWarszawska 24Poland

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