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Related Concept Videos

Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

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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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Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

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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: Apr 5, 2026

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates
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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7âˆ'ÃŽ ´/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 STO Single-crystal Substrates

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Anomalous Interface and Surface Strontium Segregation in (La1-ySry)2CoO4±δ/La1-xSrxCoO3-δ Heterostructured Thin

Zhenxing Feng, Yizhak Yacoby1, Milind J Gadre2

  • 1∥Racah Institute of Physics, Hebrew University, Jerusalem 91904, Israel.

The Journal of Physical Chemistry Letters
|August 14, 2015
PubMed
Summary

Heterostructured oxides exhibit enhanced electrochemical properties. Anomalous strontium segregation in (La1-ySry)2CoO4±δ/La1-xSrxCoO3-δ heterostructures boosts oxygen electrocatalysis activity.

Keywords:
ab initio calculationcoherent Bragg rod analysisfuel cellheterostructure perovskitesoxidesstrontium segregationsurface and interface

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Heterostructured oxides display unique electrochemical properties.
  • Ruddlesden-Popper/perovskite heterostructures show enhanced oxygen electrocatalysis.
  • (La1-ySry)2CoO4±δ/La1-xSrxCoO3-δ exhibits superior activity compared to its constituents.

Purpose of the Study:

  • To investigate the atomic-scale structure and composition of (La1-ySry)2CoO4±δ/La1-xSrxCoO3-δ heterostructures.
  • To understand the mechanism behind the enhanced catalytic activity.
  • To elucidate the role of strontium in the heterostructure's properties.

Main Methods:

  • Growth of (La1-ySry)2CoO4±δ/La1-xSrxCoO3-δ on SrTiO3.
  • Direct X-ray methods for structural and compositional analysis.
  • Ab initio calculations to model strontium segregation.

Main Results:

  • Observed anomalous strontium segregation from the perovskite to the interface and Ruddlesden-Popper phase.
  • Strontium segregation occurred during film growth.
  • No significant changes in strontium distribution after annealing in O2.

Conclusions:

  • Strontium segregation is a key factor in the enhanced oxygen electrocatalysis of (La1-ySry)2CoO4±δ/La1-xSrxCoO3-δ heterostructures.
  • Findings provide insights for designing advanced catalysts.
  • Atomic-scale understanding guides future materials design for electrocatalysis.