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Related Concept Videos

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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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...
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Updated: Jun 13, 2026

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
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Defect-State Engineering in Doped CeO2 for Oxygen Storage: Aliovalent Substitution, Co-Doping, and Pathway-Dependent

Yaohui Xu1,2, Quanhui Hou3, Yunxuan Zhou4

  • 1Laboratory for Functional Materials, School of New Energy Materials and Chemistry, Leshan Normal University, Leshan 614000, China.

Molecules (Basel, Switzerland)
|June 12, 2026
PubMed
Summary

Defect-state engineering in doped cerium dioxide (CeO2) enhances oxygen storage. Understanding dopant effects on lattice defects, not just composition, is key for optimizing oxygen-storage capacity (OSC).

Keywords:
CeO2cation–anion co-dopingdefect engineeringoxygen storage capacityoxygen vacanciesrare-earth doping

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11:54

Growth and Electrostatic/chemical Properties of Metal/LaAlO3/SrTiO3 Heterostructures

Published on: February 8, 2018

Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Catalysis

Background:

  • Cerium dioxide (CeO2) is a crucial oxygen-storage oxide due to its fluorite structure and Ce4+/Ce3+ redox couple.
  • Doped CeO2 exhibits enhanced oxygen storage, but the focus has been on dopant identity rather than defect structure.
  • Understanding defect-state construction is fundamental for optimizing oxygen-storage capacity (OSC).

Purpose of the Study:

  • To re-evaluate oxygen-storage enhancement in doped CeO2 from the perspective of defect-state engineering.
  • To analyze the impact of different doping strategies on defect formation and OSC.
  • To propose a more comprehensive framework for rationalizing OSC in doped ceria.

Main Methods:

  • Review and analysis of literature on rare-earth single doping, cation-anion co-doping, and route-dependent dopant incorporation in CeO2.
  • Correlation of doping strategies with lattice parameters, oxygen vacancy concentration, and Ce3+/Ce4+ redox behavior.
  • Examination of how different introduction pathways for dopants influence defect populations and oxygen release.

Main Results:

  • Rare-earth doping leads to lattice expansion and vacancy generation, with optima in OSC.
  • Cation-anion co-doping amplifies defect responses, showing vacancy concentration alone is insufficient to explain OSC enhancement.
  • Route-dependent doping demonstrates that the same dopant can yield different lattice and defect behaviors based on its incorporation pathway.

Conclusions:

  • Optimizing OSC in doped CeO2 requires considering a coupled set of descriptors: lattice accommodation, Ce3+/Ce4+ redistribution, oxygen vacancy abundance, and dopant incorporation pathway.
  • This defect-state engineering approach shifts the design logic from empirical screening to deliberate construction of defect structures.
  • A nuanced understanding of defect engineering provides a more effective strategy for developing advanced oxygen-storage materials.