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

doi:10.1016/j.jeurceramsoc.2006.07.002

Structural and electrical properties of MgO-doped Mn_1.4Ni_1.2Co_0.4-xMg_xO₄ (0 ≤ x ≤ 0.25) NTC thermistors

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

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

49 Citations (Scopus)

Abstract

We have prepared polycrystalline Mn_1.4Ni_1.2Co_0.4-xMg_xO₄ (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 Mn_1.4Ni_1.2Co_0.4-xMg_xO₄ samples increased, both the grain size and density decreased. The as-sintered Mn_1.4Ni_1.2Co_0.4-xMg_xO₄ samples contained Mn- and Ni-rich phases with cubic spinel structure. The MgO-doped Mn_1.4Ni_1.2Co_0.4-xMg_xO₄ negative temperature coefficient (NTC) thermistors provided various electrical properties, depending on Mg content. The electrical resistivity, B_25/85 constant, and activation energy of the Mn_1.4Ni_1.2Co_0.4-xMg_xO₄ NTC thermistors increased with increasing Mg content. The values of ρ₂₅, B_25/85 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 language	English
Pages (from-to)	2009-2016
Number of pages	8
Journal	Journal of the European Ceramic Society
Volume	27
Issue number	4
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2006.07.002
Publication status	Published - 2007

Keywords

Electrical conductivity
Electrical properties
NTC thermistor
Sintering
Transition metal oxides

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1016/j.jeurceramsoc.2006.07.002

Cite this

@article{45307931550a4b87b725451bfa51807d,

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

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.",

keywords = "Electrical conductivity, Electrical properties, NTC thermistor, Sintering, Transition metal oxides",

author = "K. Park and Kim, {S. J.} and Kim, {J. G.} and S. Nahm",

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T1 - Structural and electrical properties of MgO-doped Mn1.4Ni1.2Co0.4-xMgxO4 (0 ≤ x ≤ 0.25) NTC thermistors

AU - Park, K.

AU - Kim, S. J.

AU - Kim, J. G.

AU - Nahm, S.

PY - 2007

Y1 - 2007

N2 - 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.

AB - 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.

KW - Electrical conductivity

KW - Electrical properties

KW - NTC thermistor

KW - Sintering

KW - Transition metal oxides

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