HRTEM, SAED and XRD investigations of RE4O4[AsO 4]Cl (RE = La, Pr, Nd, Sm, Eu, Gd)

Hamdi Yahia, Ute Ch Rodewald, Khalid Boulahya, Rainer Pöttgen

Research output: Contribution to journalArticle

3 Citations (Scopus)


The new compounds RE4O4[AsO4]Cl (RE = La, Pr, Nd, Sm, Eu, Gd) were synthesised by solid state reaction via a salt flux route and investigated by HRTEM, SAED, and single crystal X-ray diffraction. The samples crystallise with a tetragonal cell, space group P42/mnm and Z = 2. Their crystal structure consists of an alternation of [RE 4O4]4+ and [ClAsO4]4- layers. The [RE4O4]4+ layer contains ORE 4/4 tetrahedra which share common edges. The anions AsO 4 3- and Cl- are located between these layers in disordered manner. SAED and HRTEM experiments confirmed this structural model and enabled us to propose an ordered model for the [ClAsO4] 4- layers.

Original languageEnglish
Pages (from-to)257-265
Number of pages9
JournalMaterials Research Bulletin
Publication statusPublished - 2014
Externally publishedYes



  • B. Crystal growth
  • C. Transmission electron microscopy (TEM)
  • C. X-ray diffraction
  • D. Crystal structure
  • D. Layered compounds

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering
  • Mechanics of Materials

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