Scandium induced structural transformation and B′:B″ cationic ordering in Pb(Fe{sub 0.5}Nb{sub 0.5})O{sub 3} multiferroic ceramics

Mallesham, B.; Manivelraja, M.

doi:10.1063/1.4890020

Title: Scandium induced structural transformation and B′:B″ cationic ordering in Pb(Fe{sub 0.5}Nb{sub 0.5})O{sub 3} multiferroic ceramics

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Abstract

The current study explores non-magnetic Sc{sup 3+} induced structural transformation, evolution of local B-site cation ordering and associated effect on ferroelectric phase transition temperature T{sub max} (temperature corresponding to dielectric maxima) on increasing the atom percent of Sc substitution in [Pb(Fe{sub 0.5}Nb{sub 0.5})O{sub 3} (PFN)] ceramics. In this regard, the phase pure Pb[(Fe{sub 0.5−x}Sc{sub x})Nb{sub 0.5}]O{sub 3} ceramics with x varying from 0 to 0.5 were synthesized through solid state reaction route. The detailed structural analysis through Rietveld refinement confirms the room temperature transformation from a monoclinic Cm to rhombohedral R3m structure at x = 0.3 mol. % of Sc. Absorption spectra studies show that there is a considerable increment in the bandgap at higher scandium content. Most interestingly, the T{sub max} exhibited an increment for lower scandium contents (x = 0.1 to 0.25) followed by a drop in T{sub max} (x = 0.3 to 0.5). Such anomalous behavior in T{sub max} is expected to arise due to the onset of B′, B″ local cation ordering beyond Sc content x = 0.25. The B-site cation ordering at and beyond x = 0.3 was also confirmed by the evolution of cation order induced Pb-O coupled vibrational mode in Raman scattering studies. In addition, the Mössbauer spectra of PFN (x = 0) and Pb(Fe{sub 0.4}Sc{sub 0.1}Nb{submore »« less

Authors:

Mallesham, B.; Manivelraja, M. ^[1]

Defence Metallurgical Research Laboratory, Hyderabad 500058 (India)

Publication Date:: Mon Jul 21 00:00:00 EDT 2014

OSTI Identifier:: 22308916

Resource Type:: Journal Article

Journal Name:: Journal of Applied Physics

Additional Journal Information:: Journal Volume: 116; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-8979

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTRA; CERAMICS; CRYSTAL STRUCTURE; FERRITES; FERROELECTRIC MATERIALS; IRON IONS; LEAD COMPOUNDS; MONOCLINIC LATTICES; NIOBATES; PHASE TRANSFORMATIONS; RAMAN EFFECT; SCANDIUM ADDITIONS; SCANDIUM IONS; SPIN; TEMPERATURE RANGE 0273-0400 K; TRANSFORMATIONS; TRANSITION TEMPERATURE; TRIGONAL LATTICES

Citation Formats


                    Mallesham, B., Ranjith, R., E-mail: ranjith@iith.ac.in, and Manivelraja, M. Scandium induced structural transformation and B′:B″ cationic ordering in Pb(Fe{sub 0.5}Nb{sub 0.5})O{sub 3} multiferroic ceramics.  United States: N. p., 2014. 
        Web.  doi:10.1063/1.4890020.

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                    Mallesham, B., Ranjith, R., E-mail: ranjith@iith.ac.in, & Manivelraja, M. Scandium induced structural transformation and B′:B″ cationic ordering in Pb(Fe{sub 0.5}Nb{sub 0.5})O{sub 3} multiferroic ceramics.  United States.  https://doi.org/10.1063/1.4890020

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                    Mallesham, B., Ranjith, R., E-mail: ranjith@iith.ac.in, and Manivelraja, M. 2014.  
        "Scandium induced structural transformation and B′:B″ cationic ordering in Pb(Fe{sub 0.5}Nb{sub 0.5})O{sub 3} multiferroic ceramics".  United States.  https://doi.org/10.1063/1.4890020.

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@article{osti_22308916,

  title        = {Scandium induced structural transformation and B′:B″ cationic ordering in Pb(Fe{sub 0.5}Nb{sub 0.5})O{sub 3} multiferroic ceramics},

  author       = {Mallesham, B. and Ranjith, R., E-mail: ranjith@iith.ac.in and Manivelraja, M.},

  abstractNote = {The current study explores non-magnetic Sc{sup 3+} induced structural transformation, evolution of local B-site cation ordering and associated effect on ferroelectric phase transition temperature T{sub max} (temperature corresponding to dielectric maxima) on increasing the atom percent of Sc substitution in [Pb(Fe{sub 0.5}Nb{sub 0.5})O{sub 3} (PFN)] ceramics. In this regard, the phase pure Pb[(Fe{sub 0.5−x}Sc{sub x})Nb{sub 0.5}]O{sub 3} ceramics with x varying from 0 to 0.5 were synthesized through solid state reaction route. The detailed structural analysis through Rietveld refinement confirms the room temperature transformation from a monoclinic Cm to rhombohedral R3m structure at x = 0.3 mol. % of Sc. Absorption spectra studies show that there is a considerable increment in the bandgap at higher scandium content. Most interestingly, the T{sub max} exhibited an increment for lower scandium contents (x = 0.1 to 0.25) followed by a drop in T{sub max} (x = 0.3 to 0.5). Such anomalous behavior in T{sub max} is expected to arise due to the onset of B′, B″ local cation ordering beyond Sc content x = 0.25. The B-site cation ordering at and beyond x = 0.3 was also confirmed by the evolution of cation order induced Pb-O coupled vibrational mode in Raman scattering studies. In addition, the Mössbauer spectra of PFN (x = 0) and Pb(Fe{sub 0.4}Sc{sub 0.1}Nb{sub 0.5})O{sub 3} (x = 0.1) are reported to verify the spin state and oxidation state of iron. The lattice distortion due to the radius ratio difference between a Sc{sup 3+} cation and Fe{sup 3+} cation in low spin state is responsible for the structural transformation, which in turn facilitates a B′:B″ cation ordering.},

  doi          = {10.1063/1.4890020},

  url          = {https://www.osti.gov/biblio/22308916},
  journal      = {Journal of Applied Physics},

  issn         = {0021-8979},

  number       = 3,

  volume       = 116,

  place        = {United States},

  year         = {Mon Jul 21 00:00:00 EDT 2014},

  month        = {Mon Jul 21 00:00:00 EDT 2014}

}

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