A study of the influence of crystallite size on the electrical and magnetic properties of CuFe{sub 2}O{sub 4}

Yaqub, Nadia; Sepiol, Bogdan; Ismail, Bushra

doi:10.1016/J.MATERRESBULL.2011.07.036

Title: A study of the influence of crystallite size on the electrical and magnetic properties of CuFe{sub 2}O{sub 4}

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Abstract

Graphical abstract: A plot of crystallite size against the normalized values of resistivity, dielectric constant and the drift mobility of the CuFe{sub 2}O{sub 4} materials. Highlights: {yields} The CuFe{sub 2}O{sub 4} materials of different crystallite sizes of <100 nm are prepared by sol-gel method and others of the size of >100 nm by combustion method. {yields} The synthesized samples are characterized for different electrical, dielectrical, magnetic and structural properties. {yields} The results show a sudden change in dc-electrical resistivity, Curie temperature, dielectric parameters, etc. when their crystallite size approaches 84 nm. {yields} This study shows transition from bulk to the nano regime takes place at the particle size of 84 nm. -- Abstract: An attempt has been made to clarify the fundamental assumption that the properties of materials change as the crystallite size of the material is reduced below 100 nm. CuFe{sub 2}O{sub 4} samples of different crystallite sizes were prepared by the sol-gel and combustion methods and then analyzed by X-ray diffraction (XRD), thermal analyses (TGA/DTG) and scanning electron microscopy (SEM) techniques. The magnetic properties were studied by measuring the AC magnetic susceptibility ({chi}) and the Moessbauer spectroscopy. The DC electrical resistivity, dielectric constant, dielectric loss tangent, Curie temperaturemore »« less

Authors:

Yaqub, Nadia ^[1]; Sepiol, Bogdan ^[2]; Ismail, Bushra ^[3]

Surface and Solid State Chemistry Laboratory, Department of Chemistry, Quaid-i-Azam University, Islamabad 45320 (Pakistan)
Faculty of Physics, University of Vienna, Strudlhofgasse 4, A-1090 Wien (Austria)
Nanoscience and Catalysis Division, National Centre for Physics, Quaid-i-Azam University, Islamabad 44000 (Pakistan)

Publication Date:: Tue Nov 15 00:00:00 EST 2011

OSTI Identifier:: 22210099

Resource Type:: Journal Article

Journal Name:: Materials Research Bulletin

Additional Journal Information:: Journal Volume: 46; Journal Issue: 11; Other Information: Copyright (c) 2011 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; COMBUSTION; CURIE POINT; DIELECTRIC MATERIALS; ELECTRIC CONDUCTIVITY; MAGNETIC MATERIALS; MAGNETIC SURFACES; MAGNETIC SUSCEPTIBILITY; MOESSBAUER EFFECT; PARTICLE SIZE; PERMITTIVITY; SCANNING ELECTRON MICROSCOPY; SOL-GEL PROCESS; X-RAY DIFFRACTION

Citation Formats


                    Iqbal, Muhammad Javed, E-mail: mjiqauchem@yahoo.com, Yaqub, Nadia, Sepiol, Bogdan, and Ismail, Bushra. A study of the influence of crystallite size on the electrical and magnetic properties of CuFe{sub 2}O{sub 4}.  United States: N. p., 2011. 
        Web.  doi:10.1016/J.MATERRESBULL.2011.07.036.

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                    Iqbal, Muhammad Javed, E-mail: mjiqauchem@yahoo.com, Yaqub, Nadia, Sepiol, Bogdan, & Ismail, Bushra. A study of the influence of crystallite size on the electrical and magnetic properties of CuFe{sub 2}O{sub 4}.  United States.  https://doi.org/10.1016/J.MATERRESBULL.2011.07.036

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                    Iqbal, Muhammad Javed, E-mail: mjiqauchem@yahoo.com, Yaqub, Nadia, Sepiol, Bogdan, and Ismail, Bushra. 2011.  
        "A study of the influence of crystallite size on the electrical and magnetic properties of CuFe{sub 2}O{sub 4}".  United States.  https://doi.org/10.1016/J.MATERRESBULL.2011.07.036.

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@article{osti_22210099,

  title        = {A study of the influence of crystallite size on the electrical and magnetic properties of CuFe{sub 2}O{sub 4}},

  author       = {Iqbal, Muhammad Javed, E-mail: mjiqauchem@yahoo.com and Yaqub, Nadia and Sepiol, Bogdan and Ismail, Bushra},

  abstractNote = {Graphical abstract: A plot of crystallite size against the normalized values of resistivity, dielectric constant and the drift mobility of the CuFe{sub 2}O{sub 4} materials. Highlights: {yields} The CuFe{sub 2}O{sub 4} materials of different crystallite sizes of <100 nm are prepared by sol-gel method and others of the size of >100 nm by combustion method. {yields} The synthesized samples are characterized for different electrical, dielectrical, magnetic and structural properties. {yields} The results show a sudden change in dc-electrical resistivity, Curie temperature, dielectric parameters, etc. when their crystallite size approaches 84 nm. {yields} This study shows transition from bulk to the nano regime takes place at the particle size of 84 nm. -- Abstract: An attempt has been made to clarify the fundamental assumption that the properties of materials change as the crystallite size of the material is reduced below 100 nm. CuFe{sub 2}O{sub 4} samples of different crystallite sizes were prepared by the sol-gel and combustion methods and then analyzed by X-ray diffraction (XRD), thermal analyses (TGA/DTG) and scanning electron microscopy (SEM) techniques. The magnetic properties were studied by measuring the AC magnetic susceptibility ({chi}) and the Moessbauer spectroscopy. The DC electrical resistivity, dielectric constant, dielectric loss tangent, Curie temperature and hyperfine splitting of the samples change with the crystallite size. The change in the electrical properties is attributed to the formation of discrete energy levels instead of the bands. However, the magnetic parameters change due to the existence of non magnetic surface layers. The isomer shift and the hyperfine splitting show gradual increase with the increase in crystallite sizes.},

  doi          = {10.1016/J.MATERRESBULL.2011.07.036},

  url          = {https://www.osti.gov/biblio/22210099},
  journal      = {Materials Research Bulletin},

  issn         = {0025-5408},

  number       = 11,

  volume       = 46,

  place        = {United States},

  year         = {Tue Nov 15 00:00:00 EST 2011},

  month        = {Tue Nov 15 00:00:00 EST 2011}

}

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