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

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

52 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

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

Access to Document

10.1016/j.jeurceramsoc.2006.07.002

Cite this

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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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