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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Ferroelectric glycine silver nitrate: a single-crystal neutron diffraction study.

R R Choudhury1, R Chitra, N Aliouane

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Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
|November 21, 2013
PubMed
Summary
This summary is machine-generated.

Protonated glycine silver nitrate (GSN) crystals transition to a ferroelectric phase at 218 K. Neutron diffraction revealed structural changes, suggesting a Jahn-Teller effect in silver ions drives this ferroelectric transition.

Keywords:
Jahn–Teller behaviorferroelectric phaselow-temperature structureneutron diffraction

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Area of Science:

  • Crystallography
  • Solid-state physics
  • Materials science

Background:

  • Glycine silver nitrate (GSN) is a light-sensitive crystal.
  • X-ray diffraction is challenging due to crystal deterioration under X-ray exposure.
  • Understanding the structural phase transition mechanism is crucial.

Purpose of the Study:

  • To determine the crystal structure of GSN in its ferroelectric phase.
  • To elucidate the mechanism of the structural phase transition.
  • To investigate the role of the Jahn-Teller effect in ferroelectricity.

Main Methods:

  • Single-crystal neutron diffraction at 150 K.
  • Crystal structure refinement (R value = 0.059).
  • Comparison of low-temperature and room-temperature structures.

Main Results:

  • The crystal structure of GSN in the ferroelectric phase was determined.
  • Structural differences between low-temperature and room-temperature phases were identified.
  • The transition is linked to the pseudo-Jahn-Teller behavior of Ag(+) ions.

Conclusions:

  • The structural phase transition in GSN is displacive, leading to a ferroelectric phase at 218 K.
  • Neutron diffraction successfully circumvented X-ray sensitivity issues.
  • The vibronic theory, specifically the Jahn-Teller effect, provides a framework for understanding the ferroelectric transition in GSN.