Mechanochemical synthesis of LaOX (X=Cl, Br) and their solid state solutions

Jaeryeong Lee, Kibu Chiyo, Fumio Saito

Research output: Contribution to journalArticlepeer-review

54 Citations (Scopus)


A mixture of lanthanum oxide (La2O3), chloride (LaCl3), and bromide (LaBr3) was ground in air by a planetary ball mill to investigate synthesis of lanthanum oxychloride (LaOCl), oxybromide (LaOBr), and their solid solutions, LaOCl1-xBrx (0≤x≤1, Δx=0.25). The synthesizing reactions proceed with an increase in grinding time. Unit cell dimensions, a, c, and lattice volume of the solutions evolve linearly with an increase in x in the LaOCl1-xBrx series. Comparing unit cell dimensions of LaOX synthesized by mechanochemical reaction to those of LaOX synthesized by solid-state reaction at high temperature, there is no difference in the length of c, while a is shortened slightly. This may be attributed to the complex cation layer of (LaO)nn+, with a close relationship to a of the cell dimensions, being affected by the intensive grinding.

Original languageEnglish
Pages (from-to)469-473
Number of pages5
JournalJournal of Solid State Chemistry
Issue number2
Publication statusPublished - 2001 Jan 1


  • LaOBr
  • LaOCl
  • Lattice parameter deviation
  • Mechanochemical reaction
  • PbFCl structure

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


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