XRD and TEM study of the anisotropy of an anomalous grandite garnet from Recsk, Matra mts. (N-Hungary)

I. Dodony, G. A. Lovas, M. Soos

Research output: Contribution to journalConference article


Although there can be several possible hypothetical reasons for optical anomaly, except for cation ordering in octahedral sites, no indications of any of their presence were found in the title material. An earlier optical and microprobe study concluded, that the optical anomaly of this material is directly proportional to the A1 content, but there is no uniform functional relation between the optical and chemical properties. Theoretical powder patterns calculated, using the Rietveld technique, on the basis of cubic and triclinic structural models representing different stages of cation ordering were used to match the experimental diffraction profile. Although the XRD measurements could not give direct evidence for ordering, they provided reliable observations for the partial symmetry degradation of the target sample. Subsequent TEM examinations showed a wide range of variations in the ordering of cations in octahedral positions on the {110} planes. These ordered regions form slabs with different thickness in one of the [111] directions. Consequently it can be concluded, that a combined XRD and TEM study can be an adequate approach for detecting and characterizing a slight cation ordering and structural distortions in grandite solid solutions.

Original languageEnglish
Pages (from-to)637-642
Number of pages6
JournalMaterials Science Forum
Issue numberpt 2
Publication statusPublished - 1994
EventProceedings of the 3rd European Powder Diffraction Conference. Part 2 (of 2) - Vienna, Austria
Duration: Sep 25 1993Sep 28 1993

ASJC Scopus subject areas

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

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