Elucidation of structure and conduction mechanism in Nd-Mn substituted Y-type strontium hexaferrites

Bashir Ahmad, Muhammad Naeem Ashiq, Muhammad Shuaib Khan, Minoru Osada, Muhammad Najam-Ul-Haq, Irshad Ali

    Research output: Contribution to journalArticle

    6 Citations (Scopus)

    Abstract

    Technologically important ferrites magnetic materials with nominal composition “Sr2-xNdxCo2MnyFe12-yO22” (x = 0.0 to 0.1 and y = 0.0 to 1.0) were fabricated by the simple sol-gel method. The X-ray diffraction analysis endorsed the formation of well-defined Y-type hexagonal single phase with crystallite size in range of 38–45 nm. Owing to reduction of Fe3+ ions at octahedral site, an increase in DC resistivity was observed from 4.083 × 108 to 2.376 × 109 Ω-cm with the increase in substituents content. The two conduction mechanisms operating in ferri- and paramagnetic regions were shown by Arrhenius plot. It was observed that conduction in ferrimagnetic and paramagnetic regions was governed by the hopping of electrons and polarons, respectively. The decrease in Curie temperature “Tc” (553-423 K) was detected as a factor of Nd-Mn content due to decrease in Fe[sbnd]Fe interaction at octahedral site. The changes in the values of dielectric constant (ε), dielectric loss factor (ε) and tan loss (δ) follow Maxwell-Wagner model. The relatively high resistivity (2.376 × 109 Ω-cm) and low dielectric constants (2.97 at 1 MHz) for the sample with x = 0.1 and y = 1.0 make this material as an excellent candidates for high frequency microwave devices.

    Original languageEnglish
    Pages (from-to)9-16
    Number of pages8
    JournalJournal of Alloys and Compounds
    Volume723
    DOIs
    Publication statusPublished - 2017 Nov 5

    Fingerprint

    Strontium
    Permittivity
    Polarons
    Arrhenius plots
    Microwave devices
    Ferrites
    Magnetic materials
    Dielectric losses
    Crystallite size
    Curie temperature
    X ray diffraction analysis
    Sol-gel process
    Ions
    Electrons
    Chemical analysis

    Keywords

    • Conduction mechanism
    • DC resistivity
    • Dielectric properties
    • Y-type hexagonal ferrites

    ASJC Scopus subject areas

    • Mechanics of Materials
    • Mechanical Engineering
    • Metals and Alloys
    • Materials Chemistry

    Cite this

    Elucidation of structure and conduction mechanism in Nd-Mn substituted Y-type strontium hexaferrites. / Ahmad, Bashir; Ashiq, Muhammad Naeem; Khan, Muhammad Shuaib; Osada, Minoru; Najam-Ul-Haq, Muhammad; Ali, Irshad.

    In: Journal of Alloys and Compounds, Vol. 723, 05.11.2017, p. 9-16.

    Research output: Contribution to journalArticle

    Ahmad, Bashir ; Ashiq, Muhammad Naeem ; Khan, Muhammad Shuaib ; Osada, Minoru ; Najam-Ul-Haq, Muhammad ; Ali, Irshad. / Elucidation of structure and conduction mechanism in Nd-Mn substituted Y-type strontium hexaferrites. In: Journal of Alloys and Compounds. 2017 ; Vol. 723. pp. 9-16.
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    abstract = "Technologically important ferrites magnetic materials with nominal composition “Sr2-xNdxCo2MnyFe12-yO22” (x = 0.0 to 0.1 and y = 0.0 to 1.0) were fabricated by the simple sol-gel method. The X-ray diffraction analysis endorsed the formation of well-defined Y-type hexagonal single phase with crystallite size in range of 38–45 nm. Owing to reduction of Fe3+ ions at octahedral site, an increase in DC resistivity was observed from 4.083 × 108 to 2.376 × 109 Ω-cm with the increase in substituents content. The two conduction mechanisms operating in ferri- and paramagnetic regions were shown by Arrhenius plot. It was observed that conduction in ferrimagnetic and paramagnetic regions was governed by the hopping of electrons and polarons, respectively. The decrease in Curie temperature “Tc” (553-423 K) was detected as a factor of Nd-Mn content due to decrease in Fe[sbnd]Fe interaction at octahedral site. The changes in the values of dielectric constant (ε′), dielectric loss factor (ε″) and tan loss (δ) follow Maxwell-Wagner model. The relatively high resistivity (2.376 × 109 Ω-cm) and low dielectric constants (2.97 at 1 MHz) for the sample with x = 0.1 and y = 1.0 make this material as an excellent candidates for high frequency microwave devices.",
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