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Zeolite collapse and polyamorphism.

G Neville Greaves1, F Meneau, F Kargl

  • 1Centre for Advanced Functional Materials and Devices, Institute of Mathematical and Physical Sciences, University of Wales, Aberystwyth, Aberystwyth SY23 3BZ, UK.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 14, 2017
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Summary
This summary is machine-generated.

Zeolite collapse, driven by polyamorphism, transforms low-density structures into high-density phases. This study details the structural and dynamic changes during this critical transition in microporous crystals.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Crystallography

Background:

  • Zeolites are microporous crystalline materials with diverse industrial applications.
  • Understanding structural transitions like collapse is crucial for material stability and performance.
  • Polyamorphism, the existence of multiple amorphous phases, plays a key role in zeolite structural changes.

Purpose of the Study:

  • To outline the phenomenology of zeolite collapse.
  • To investigate the role of polyamorphism in destabilizing zeolite structures.
  • To characterize the structural and dynamic changes during zeolite collapse.

Main Methods:

  • Synchrotron X-ray diffraction experiments.
  • Computer simulations of low-density cage structures (e.g., zeolite A, zeolite Y).
  • Magic angle spinning Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Inelastic X-ray scattering (IXS).
  • Inelastic neutron scattering (INS).

Main Results:

  • Polyamorphism is identified as a key factor in destabilizing zeolitic structures.
  • Transitions between ordered, disordered, and amorphous phases are observed.
  • Significant differences in entropy and density exist between polyamorphic phases and the precursor zeolite.
  • Changes in structural order and mechanical rigidity are highlighted by NMR and IXS.
  • Two-level systems, detected by INS, are linked to the dynamics of zeolite cage collapse.

Conclusions:

  • Zeolite collapse is a complex process involving polyamorphism and phase transitions.
  • The study provides insights into the structural and dynamic mechanisms governing zeolite collapse.
  • Understanding these phenomena is essential for designing stable and functional zeolite materials.