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Applied Physics A

, 124:609 | Cite as

Effect of defect states and oxygen vacancies on optical transitions due to Co2+ substitution in CeO2

  • Saurabh Tiwari
  • Nasima Khatun
  • Parasmani Rajput
  • Dibyendu Bhattacharya
  • S. N. Jha
  • Chuan-Ming Tseng
  • Shun-Wei Liu
  • Sajal Biring
  • Somaditya SenEmail author
Article
  • 123 Downloads

Abstract

CeO2 has cubic fluorite structure which is modified due to oxygen content as well as external substituents. The oxidation state of Ce plays an important role in strain and related physical properties. Ce3+ being larger in size than the Ce4+ ion, one expects a change in band structure due to changes in bond length; substitution of Ce4+ by Co2+ in sol–gel prepared, homogeneous, single-phase Ce1−xCoxO2 (x ≤ 10) nanopowders. The lower valence states of Co2+ induces oxygen vacancies which transforms some Ce4+ to Ce3+. A careful study of oxygen vacancies, strain, bond length and related band structure changes, have been targeted in this study. The possibility of phonon participation in electronic transition has been discussed using Tauc plot. Ce3+ forms defect states, between valence and conduction bands. Lattice parameters decrease, but strain increases with substitution.

Notes

Acknowledgements

Principle investigator expresses sincere thanks to Indian Institute of Technology Indore for funding the research. The authors sincerely thank Sophisticated Instrument Centre (IIT Indore) for FESEM studies, Dr. V. K. Jain (Amity University) for UV–Vis analysis and Dr. Manoj Kumar (IISER Bhopal) for Raman studies. One of the authors (Dr. Sajal Biring) acknowledges the financial support from Ministry of Science and Technology, Taiwan (MOST 105-2218-E131-003) and (106-2221-E-131-027).

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Saurabh Tiwari
    • 1
  • Nasima Khatun
    • 2
  • Parasmani Rajput
    • 3
  • Dibyendu Bhattacharya
    • 3
  • S. N. Jha
    • 3
  • Chuan-Ming Tseng
    • 4
  • Shun-Wei Liu
    • 5
  • Sajal Biring
    • 5
  • Somaditya Sen
    • 1
    • 5
    Email author return OK on get
  1. 1.Metallurgy Engineering and Material SciencesIndian Institute of Technology IndoreIndoreIndia
  2. 2.Department of PhysicsIndian Institute of Technology IndoreIndoreIndia
  3. 3.Atomic and Molecular Physics Division Bhabha Atomic Research CentreMumbaiIndia
  4. 4.Materials EngineeringMing Chi University of TechnologyNew Taipei CityTaiwan
  5. 5.Electronic EngineeringMing Chi University of TechnologyNew Taipei CityTaiwan

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