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Ionic Crystal Structures02:42

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Hyperpolarized Xenon for NMR and MRI Applications
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Polymorphism of CaTeO3 and solid solutions Ca(x)Sr(1-x)TeO3.

Berthold Stöger1, Matthias Weil, Erich Zobetz

  • 1Institute for Chemical Technologies and Analytics, Division of Structural Chemistry, Vienna University of Technology, Getreidemarkt 9/164-SC, A-1060 Vienna, Austria.

Acta Crystallographica. Section B, Structural Science
|March 21, 2009
PubMed
Summary

This study synthesizes and characterizes calcium tellurate(IV) phases and solid solutions, revealing unique channel structures and polymorph relationships. The findings offer insights into the structural diversity of calcium tellurate compounds.

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Area of Science:

  • Solid-state chemistry
  • Materials science
  • Crystallography

Background:

  • Calcium tellurate(IV) (CaTeO3) exhibits complex polymorphism.
  • Understanding these phases is crucial for materials development.

Purpose of the Study:

  • To synthesize and characterize various CaTeO3 polymorphs and Ca(x)Sr(1-x)TeO3 solid solutions.
  • To elucidate the structural relationships between these phases.

Main Methods:

  • Single crystal and microcrystalline synthesis.
  • X-ray diffraction analysis.
  • Thermal analysis.

Main Results:

  • Four polymorphs of CaTeO3 (alpha, beta, beta', gamma) and two solid solutions Ca(x)Sr(1-x)TeO3 were synthesized.
  • Structures feature isolated [Te(IV)O3]2- units and [(Ca,Sr)O(x)] polyhedra with protruding Te(IV) lone pairs.
  • Alpha-CaTeO3 has cylindrical channels, while high-temperature phases have oval channels; gamma-CaTeO3 is an order-disorder structure.

Conclusions:

  • The study provides a comparative description of CaTeO3 polymorphs and solid solutions.
  • Structural relationships and phase transitions were clarified.
  • The findings contribute to the understanding of tellurate chemistry and crystal engineering.