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

I. Dódony, G. A. Lovas, M. Soos

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

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
Title of host publicationMaterials Science Forum
EditorsR. Delhez, E.J. Mittemeijer
PublisherTrans Tech Publ
Pages637-642
Number of pages6
Volume166-169
Editionpt 2
Publication statusPublished - 1994
EventProceedings of the 3rd European Powder Diffraction Conference. Part 2 (of 2) - Vienna, Austria
Duration: Sep 25 1993Sep 28 1993

Other

OtherProceedings of the 3rd European Powder Diffraction Conference. Part 2 (of 2)
CityVienna, Austria
Period9/25/939/28/93

Fingerprint

Garnets
Cations
Anisotropy
Positive ions
Transmission electron microscopy
Powders
Chemical properties
Solid solutions
Optical properties
Diffraction
Degradation

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Dódony, I., Lovas, G. A., & Soos, M. (1994). XRD and TEM study of the anisotropy of an anomalous grandite garnet from Recsk, Matra mts. (N-Hungary). In R. Delhez, & E. J. Mittemeijer (Eds.), Materials Science Forum (pt 2 ed., Vol. 166-169, pp. 637-642). Trans Tech Publ.

XRD and TEM study of the anisotropy of an anomalous grandite garnet from Recsk, Matra mts. (N-Hungary). / Dódony, I.; Lovas, G. A.; Soos, M.

Materials Science Forum. ed. / R. Delhez; E.J. Mittemeijer. Vol. 166-169 pt 2. ed. Trans Tech Publ, 1994. p. 637-642.

Research output: Chapter in Book/Report/Conference proceedingChapter

Dódony, I, Lovas, GA & Soos, M 1994, XRD and TEM study of the anisotropy of an anomalous grandite garnet from Recsk, Matra mts. (N-Hungary). in R Delhez & EJ Mittemeijer (eds), Materials Science Forum. pt 2 edn, vol. 166-169, Trans Tech Publ, pp. 637-642, Proceedings of the 3rd European Powder Diffraction Conference. Part 2 (of 2), Vienna, Austria, 9/25/93.
Dódony I, Lovas GA, Soos M. XRD and TEM study of the anisotropy of an anomalous grandite garnet from Recsk, Matra mts. (N-Hungary). In Delhez R, Mittemeijer EJ, editors, Materials Science Forum. pt 2 ed. Vol. 166-169. Trans Tech Publ. 1994. p. 637-642
Dódony, I. ; Lovas, G. A. ; Soos, M. / XRD and TEM study of the anisotropy of an anomalous grandite garnet from Recsk, Matra mts. (N-Hungary). Materials Science Forum. editor / R. Delhez ; E.J. Mittemeijer. Vol. 166-169 pt 2. ed. Trans Tech Publ, 1994. pp. 637-642
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