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Structure, morphology and magnetodielectric investigations of BaTi1−xFexO3−δ ceramics

  • P. Esther Rubavathi
  • L. Venkidu
  • M. Veera Gajendra Babu
  • R. Venkat Raman
  • B. Bagyalakshmi
  • S. M. Abdul Kader
  • K. Baskar
  • M. Muneeswaran
  • N. V. Giridharan
  • B. SundarakannanEmail author
Article

Abstract

Ferromagnetism is successfully imposed on a robust ferroelectric material by Fe-substitution and magnetodielectric investigation of the ceramics leads us to propose a sensor for magnetic field measurement. Tetragonal to hexagonal structural phase transformation is unambiguously identified from Rietveld refinement of the structure. Coexistence of tetragonal and hexagonal phase is also identified from Raman spectra and SAED. Structural details of the two phases and phase percentage are correlated to the physical properties obtained from P–E loop, M–H loop and magnetodielectric measurements. Ferroelectric loops are diminished due to pinning of domain wall motion by oxygen vacancies and an increase of the non-ferroelectric hexagonal phase percentage. The decrease of remnant magnetization is ascribed to the occupancy of Fe in pentahedral–octahedral sites and oxygen vacancies. Magnetodielectric dispersion below 104 Hz is predominantly due to extrinsic origin through the combined effect of space charge polarization and magnetoresistance. The intrinsic magnetodielectric effect above 104 Hz is attributed to strain mediated magnetoelectric coupling.

Notes

Acknowledgements

Ms. P.E would like to acknowledge financial support from the University Grants Commission, New Delhi through BSR fellowship (F.No.:25-1/2014-15(BSR)/7-305/2010/(BSR)). DST-FIST powder XRD facility of Department of Physics is also acknowledged.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  • P. Esther Rubavathi
    • 1
  • L. Venkidu
    • 1
  • M. Veera Gajendra Babu
    • 1
  • R. Venkat Raman
    • 1
  • B. Bagyalakshmi
    • 1
  • S. M. Abdul Kader
    • 2
  • K. Baskar
    • 1
    • 3
  • M. Muneeswaran
    • 4
  • N. V. Giridharan
    • 5
  • B. Sundarakannan
    • 1
    Email author
  1. 1.Department of PhysicsManonmaniam Sundaranar UniversityTirunelveliIndia
  2. 2.Department of PhysicsSadakathullah Appa CollegeTirunelveliIndia
  3. 3.Crystal Growth CentreAnna UniversityChennaiIndia
  4. 4.Department of PhysicsPukyong National UniversityBusanSouth Korea
  5. 5.Advanced Functional Materials Laboratory, Department of PhysicsNational Institute of TechnologyTiruchirappalliIndia

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