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Ilmenite-type Na2(Fe2/3Te4/3)O6.

Felix Eder1, Matthias Weil1

  • 1TU Wien, Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, Getreidemarkt 9/E164-05-1, 1060 Vienna, Austria.

Iucrdata
|June 7, 2024
PubMed
Summary

Tris-odium iron(III) ditellurium(VI) nona-oxide crystallizes in the ilmenite structure. Sodium and mixed iron-tellurium sites show distinct octahedral distortions, impacting crystal properties.

Keywords:
close-packed structurecrystal structureisotypismmixed occupancy

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Crystallography

Background:

  • The ilmenite structure (FeTiO3) is a common motif in various functional materials.
  • Understanding cation site occupancy and distortion is crucial for predicting material properties.

Purpose of the Study:

  • To elucidate the crystal structure of tris-odium iron(III) ditellurium(VI) nona-oxide, Na3(FeTe2)O9.
  • To analyze the coordination environment and distortions around the sodium and mixed-occupied iron-tellurium sites.

Main Methods:

  • Single-crystal X-ray diffraction was employed to determine the crystal structure.
  • Analysis of bond lengths and distortion parameters quantified the octahedral geometries.

Main Results:

  • The compound adopts the ilmenite structure type (FeTiO3).
  • The Ti site is occupied by Na, and the Fe site is a mixed site of Fe(III) and Te(VI) in a 1:2 ratio.
  • The [NaO6] octahedron exhibits significant distortions compared to the slightly distorted [(Fe,Te)O6] octahedron.

Conclusions:

  • The structural characterization reveals a novel ilmenite derivative with unique site occupancies.
  • The differing octahedral distortions provide insights into potential structure-property relationships for this material.