Structural and electrical properties of MgO-doped Mn1.4Ni1.2Co0.4-xMgxO4 (0 ≤ x ≤ 0.25) NTC thermistors

K. Park, S. J. Kim, J. G. Kim, S. Nahm

    Research output: Contribution to journalArticlepeer-review

    52 Citations (Scopus)

    Abstract

    We have prepared polycrystalline Mn1.4Ni1.2Co0.4-xMgxO4 (0 ≤ x ≤ 0.25) samples using a solid-state reaction process and investigated the MgO doping effect on the microstructure and the electrical properties. It was found that, as the amount of Mg content in the Mn1.4Ni1.2Co0.4-xMgxO4 samples increased, both the grain size and density decreased. The as-sintered Mn1.4Ni1.2Co0.4-xMgxO4 samples contained Mn- and Ni-rich phases with cubic spinel structure. The MgO-doped Mn1.4Ni1.2Co0.4-xMgxO4 negative temperature coefficient (NTC) thermistors provided various electrical properties, depending on Mg content. The electrical resistivity, B25/85 constant, and activation energy of the Mn1.4Ni1.2Co0.4-xMgxO4 NTC thermistors increased with increasing Mg content. The values of ρ25, B25/85 constant, and activation energy of the NTC thermistors were 11,185-20,016 Ω cm, 3635-4032 K, and 0.313-0.348 eV, respectively.

    Original languageEnglish
    Pages (from-to)2009-2016
    Number of pages8
    JournalJournal of the European Ceramic Society
    Volume27
    Issue number4
    DOIs
    Publication statusPublished - 2007

    Bibliographical note

    Funding Information:
    This work was supported by Small and Medium Business Administration in Korea.

    Copyright:
    Copyright 2008 Elsevier B.V., All rights reserved.

    Keywords

    • Electrical conductivity
    • Electrical properties
    • NTC thermistor
    • Sintering
    • Transition metal oxides

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry

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