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Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...

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Related Experiment Video

Updated: Jun 11, 2026

Synthesis of Zeolites Using the ADOR (Assembly-Disassembly-Organization-Reassembly) Route
08:26

Synthesis of Zeolites Using the ADOR (Assembly-Disassembly-Organization-Reassembly) Route

Published on: April 3, 2016

Flexibility of ideal zeolite frameworks.

V Kapko1, C Dawson, M M J Treacy

  • 1Arizona State University, Department of Physics, P.O. Box 871504, Tempe, AZ 85287-1504, USA.

Physical Chemistry Chemical Physics : PCCP
|July 1, 2010
PubMed
Summary

Zeolite frameworks possess flexibility windows, a range of densities where they are stress-free. This flexibility is a key indicator for predicting the successful synthesis of new zeolite materials.

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Last Updated: Jun 11, 2026

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Area of Science:

  • Materials Science
  • Chemistry
  • Crystallography

Background:

  • Zeolites are crystalline materials with diverse applications in catalysis and separation.
  • Understanding the structural flexibility of zeolites is crucial for predicting their stability and synthesis.
  • Previous studies have focused on specific zeolite structures, but a systematic analysis of known frameworks is lacking.

Purpose of the Study:

  • To investigate the flexibility windows of 194 known zeolite frameworks.
  • To establish flexibility as a predictive tool for zeolite synthetic feasibility.
  • To develop computational methods for assessing zeolite flexibility.

Main Methods:

  • Modeling zeolites as assemblies of rigid tetrahedra connected by spherical joints (oxygen atoms).
  • Defining the flexibility window as the null-space of the kinematic matrix governing framework motions.
  • Ignoring inter-tetrahedral forces beyond the hard-sphere model.

Main Results:

  • Almost all known aluminosilicate and aluminophosphate zeolites exhibit a flexibility window.
  • The presence of a flexibility window strongly correlates with synthetic feasibility.
  • Computational methods for exploring flexibility windows were successfully applied.

Conclusions:

  • Flexibility is an inherent property of most known zeolite frameworks.
  • The concept of flexibility windows provides a valuable criterion for identifying potentially synthesizable zeolite topologies.
  • This work offers a new perspective on zeolite design and discovery.