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Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

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Radio Frequency Magnetron Sputtering of GdBa2Cu3O7&#8722;&#948;/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates
06:49

Radio Frequency Magnetron Sputtering of GdBa2Cu3O7−δ/ La0.67Sr0.33MnO3 Quasi-bilayer Films on SrTiO3 (STO) Single-crystal Substrates

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Microstructural evolution in a CeO2-Gd2O3 system.

Fei Ye1, Ding Rong Ou, Toshiyuki Mori

  • 1Key Laboratory of Materials Modification, School of Materials Science and Engineering, Dalian University of Technology, 2 Linggong Road, Dalian, Liaoning 116024, China. yefei@dlut.edu.cn

Microscopy and Microanalysis : the Official Journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada
|December 17, 2011
PubMed
Summary
This summary is machine-generated.

The study reveals a gradual microstructural evolution in cerium oxide-gadolinium oxide (CeO2-Gd2O3) systems. Increasing gadolinium concentration leads to continuous ordering of gadolinium cations and oxygen vacancies within defect clusters.

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Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Nanotechnology

Background:

  • Cerium oxide (CeO2) based materials are crucial for various applications, including solid oxide fuel cells and catalysis.
  • Understanding the structural and defect evolution in CeO2-Gd2O3 systems is vital for optimizing their performance.
  • Gadolinium (Gd) doping in CeO2 introduces oxygen vacancies, significantly impacting its properties.

Purpose of the Study:

  • To comprehensively investigate the microstructural evolution in the CeO2-Gd2O3 system at atomic and nanoscale.
  • To elucidate the phase transformation process from fluorite to C-type structure with increasing Gd concentration.
  • To characterize the development and ordering of defect clusters containing Gd cations and oxygen vacancies.

Main Methods:

  • Transmission electron microscopy (TEM) was employed to analyze microstructural changes.
  • High-resolution imaging and diffraction techniques were utilized to observe atomic and nanoscale features.
  • Systematic variation of Gd concentration (10 to 80 at.%) allowed for tracking evolutionary trends.

Main Results:

  • The phase transformation from fluorite to C-type structure is an evolutionary process, not abrupt.
  • Clusters, domains, and precipitates of C-type structure form sequentially within the fluorite matrix.
  • Continuous ordering of Gd cations and oxygen vacancies was observed with increasing Gd concentration.
  • The development of defect clusters containing Gd and oxygen vacancies governs the microstructural evolution.

Conclusions:

  • The microstructural evolution in CeO2-Gd2O3 is a continuous process driven by the formation and ordering of defect clusters.
  • The observed evolution provides insights into the fundamental mechanisms governing solid solution formation in oxide systems.
  • This detailed understanding is critical for designing advanced CeO2-based materials with tailored properties.