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Applied Physics A

, 122:920 | Cite as

Vacancy defects and defect clusters in alkali metal ion-doped MgO nanocrystallites studied by positron annihilation and photoluminescence spectroscopy

  • S. SellaiyanEmail author
  • A. Uedono
  • K. Sivaji
  • S. Janet Priscilla
  • J. Sivasankari
  • T. Selvalakshmi
Article

Abstract

Pure and alkali metal ion (Li, Na, and K)-doped MgO nanocrystallites synthesized by solution combustion technique have been studied by positron lifetime and Doppler broadening spectroscopy methods. Positron lifetime analysis exhibits four characteristic lifetime components for all the samples. Doping reduces the Mg vacancy after annealing to 800 °C. It was observed that Li ion migrates to the vacancy site to recover Mg vacancy-type defects, reducing cluster vacancies and micropores. For Na- and K-doped MgO, the aforementioned defects are reduced and immobile at 800 °C. Coincidence Doppler broadening studies show the positron trapping sites as vacancy clusters. The decrease in the S parameter is due to the particle growth and reduction in the defect concentration at 800 °C. Photoluminescence study shows an emission peak at 445 nm and 498 nm, associated with F2 2+ and recombination of higher-order vacancy complexes. Further, annealing process is likely to dissociate F2 2+ to F+ and this F+ is converted into F centers at 416 nm.

Keywords

Oxygen Vacancy Positron Annihilation Positron Lifetime Cluster Vacancy Vacancy Defect 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors are thankful to Dr. Shanmugavel Chinnathambi, for PL measurement at the National Institute for Materials Science (NIMS), Japan.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • S. Sellaiyan
    • 1
    Email author
  • A. Uedono
    • 1
  • K. Sivaji
    • 2
  • S. Janet Priscilla
    • 2
  • J. Sivasankari
    • 3
  • T. Selvalakshmi
    • 4
  1. 1.Division of Applied PhysicsUniversity of TsukubaTsukubaJapan
  2. 2.Department of Nuclear PhysicsUniversity of MadrasChennaiIndia
  3. 3.Department of PhysicsAnna UniversityChennaiIndia
  4. 4.Nanomaterials Laboratory, Department of PhysicsNational Institute of TechnologyTiruchirappalliIndia

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