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Related Concept Videos

Crystal Density01:19

Crystal Density

The crystal lattice structure of a material allows us to determine how many molecules exist in its unit cell. With this information, alongside the unit-cell parameters - three distance parameters (a, b, c) and three angular parameters (α, β, γ).Density (ρ) = (Z × M) / (a × b × c × NA)where:Z is the number of formula units per unit cellM is the molar mass of the substancea, b, and c are the edge lengths of the unit cellNA is Avogadro’s numberFor a simple cubic lattice, atoms are located only at...
Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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...
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...

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Related Experiment Video

Updated: Jun 27, 2026

Synthesis and Exfoliation of Discotic Zirconium Phosphates to Obtain Colloidal Liquid Crystals
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Stoichiometry deviation in amorphous zirconium dioxide.

Michael J D Rushton1, Iuliia Ipatova1, Lee J Evitts1

  • 1Nuclear Futures: Materials, Bangor University Bangor LL57 1UT UK s.middleburgh@bangor.ac.uk.

RSC Advances
|May 6, 2022
PubMed
Summary
This summary is machine-generated.

Amorphous zirconia readily accommodates excess oxygen by forming peroxide defects. This finding, revealed through advanced simulations, has broad implications for various material systems.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Solid State Physics

Background:

  • Amorphous zirconia (a-ZrO2) is a technologically important material.
  • Understanding its defect chemistry and structure is crucial for optimizing its properties.
  • Previous studies have faced challenges in comprehensively investigating amorphous systems.

Purpose of the Study:

  • To investigate the complex chemistry and structure of amorphous zirconia.
  • To explore the mechanisms of oxygen accommodation in a-ZrO2.
  • To determine the structural characteristics of amorphous zirconia.

Main Methods:

  • Synergistic application of reverse Monte Carlo (RMC), molecular dynamics (MD), and density functional theory (DFT).
  • Computational simulation of amorphous zirconia system.
  • Analysis of defect formation and structural motifs.

Main Results:

  • Amorphous zirconia readily accommodates excess oxygen via neutral peroxide (O2 2-) defects.
  • The formation of these defects has implications for network formers, intermediates, and modifiers.
  • The structure of a-ZrO2 exhibits edge-sharing characteristics, similar to amorphous tellurium dioxide (a-TeO2) and chalcogenide glasses.

Conclusions:

  • Advanced computational methods provide powerful tools for studying amorphous materials.
  • The identified peroxide defect mechanism is significant for understanding oxygen incorporation in oxides.
  • The structural similarities suggest common formation principles in amorphous oxide and chalcogenide systems.