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Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
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Thortveitite-type Tm2Si2O7.

Volker Kahlenberg1, Paul Aichholzer1

  • 1University of Innsbruck, Institute of Mineralogy & Petrography, Innrain 52, A-6020 Innsbruck, Austria.

Acta Crystallographica. Section E, Structure Reports Online
|August 28, 2014
PubMed
Summary
This summary is machine-generated.

Single crystals of dithulium disilicate (Tm2Si2O7) were synthesized, revealing a structure based on [Si2O7] units. This sorosilicate crystallizes in the thortveitite structure type, featuring layered TmO6 octahedra and SiO4 tetrahedra.

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Area of Science:

  • Solid-state chemistry
  • Crystallography
  • Materials science

Background:

  • Sorosilicates are characterized by the presence of the [Si2O7] structural unit.
  • The thortveitite structure type (Sc2Si2O7) is a known framework for rare-earth disilicates.

Purpose of the Study:

  • To synthesize single crystals of dithulium disilicate (Tm2Si2O7).
  • To determine the crystal structure and bonding characteristics of Tm2Si2O7.

Main Methods:

  • Flux synthesis experiments in the SiO2-Tm2O3-LiF system at ambient pressure.
  • Single crystal X-ray diffraction analysis.

Main Results:

  • Single crystals of Tm2Si2O7 were successfully obtained.
  • The compound crystallizes in the thortveitite structure type, analogous to Sc2Si2O7.
  • Tm(3+) cations occupy distorted octahedral sites (Tm-O bond lengths: 2.217–2.289 Å), forming layers parallel to (001) through edge-sharing.
  • Individual [SiO4] tetrahedra exhibit regular geometry.
  • An alternating sequence of TmO6 octahedra layers and [Si2O7] groups sheets is observed, linked by shared oxygen vertices.

Conclusions:

  • Dithulium disilicate (Tm2Si2O7) has been synthesized and structurally characterized.
  • The crystal structure consists of layered [TmO6] octahedra and [Si2O7] groups, consistent with the thortveitite structure type.
  • The linkage of structural units provides insights into the bonding and stability of this sorosilicate.