The effect of Zn on the microstructure and electrical properties of Mn1.17-xNi0.93Co0.9ZnxO4 (0 ≤ x ≤ 0.075) NTC thermistors

K. Park; J. K. Lee; S. J. Kim; W. S. Seo; W. S. Cho; C. W. Lee; S. Nahm

doi:10.1016/j.jallcom.2007.11.105

The effect of Zn on the microstructure and electrical properties of Mn_1.17-xNi_0.93Co_0.9Zn_xO₄ (0 ≤ x ≤ 0.075) NTC thermistors

K. Park, J. K. Lee, S. J. Kim, W. S. Seo, W. S. Cho, C. W. Lee, S. Nahm

Department of Materials Science and Engineering

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

58 Citations (Scopus)

Abstract

As-sintered Mn_1.17-xNi_0.93Co_0.9Zn_xO₄ (0 ≤ x ≤ 0.075) bodies consisted of two phases: a major Mn-rich phase with a cubic spinel structure and a minor NiO phase with a cubic structure. The Mn_1.17-xNi_0.93Co_0.9Zn_xO₄ ceramics were highly dense, ranging from 96 to 98% of the theoretical density and were microscopically homogeneous. The addition of Zn did not cause much change in the grain size and porosity. The obtained ρ₂₅, B_25/85 constant, and activation energy of the negative temperature coefficient (NTC) Mn_1.17-xNi_0.93Co_0.9Zn_xO₄ thermistors were in the range 1145-3696 Ω cm, 3218-3550 K, and 0.277-0.306 eV, respectively. This means that the electrical properties can be adjusted to desired values, depending on their Zn content. In particular, the resistivity and sensitivity were substantially enhanced with increasing Zn content.

Original language	English
Pages (from-to)	310-316
Number of pages	7
Journal	Journal of Alloys and Compounds
Volume	467
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2007.11.105
Publication status	Published - 2009 Jan 7

Keywords

Microstructure
MnNiCoZnO
NTC thermistors
Resistivity
ZnO

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/j.jallcom.2007.11.105

Cite this

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title = "The effect of Zn on the microstructure and electrical properties of Mn1.17-xNi0.93Co0.9ZnxO4 (0 ≤ x ≤ 0.075) NTC thermistors",

abstract = "As-sintered Mn1.17-xNi0.93Co0.9ZnxO4 (0 ≤ x ≤ 0.075) bodies consisted of two phases: a major Mn-rich phase with a cubic spinel structure and a minor NiO phase with a cubic structure. The Mn1.17-xNi0.93Co0.9ZnxO4 ceramics were highly dense, ranging from 96 to 98% of the theoretical density and were microscopically homogeneous. The addition of Zn did not cause much change in the grain size and porosity. The obtained ρ25, B25/85 constant, and activation energy of the negative temperature coefficient (NTC) Mn1.17-xNi0.93Co0.9ZnxO4 thermistors were in the range 1145-3696 Ω cm, 3218-3550 K, and 0.277-0.306 eV, respectively. This means that the electrical properties can be adjusted to desired values, depending on their Zn content. In particular, the resistivity and sensitivity were substantially enhanced with increasing Zn content.",

keywords = "Microstructure, MnNiCoZnO, NTC thermistors, Resistivity, ZnO",

author = "K. Park and Lee, {J. K.} and Kim, {S. J.} and Seo, {W. S.} and Cho, {W. S.} and Lee, {C. W.} and S. Nahm",

year = "2009",

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language = "English",

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AU - Park, K.

AU - Lee, J. K.

AU - Kim, S. J.

AU - Seo, W. S.

AU - Cho, W. S.

AU - Lee, C. W.

AU - Nahm, S.

PY - 2009/1/7

Y1 - 2009/1/7

N2 - As-sintered Mn1.17-xNi0.93Co0.9ZnxO4 (0 ≤ x ≤ 0.075) bodies consisted of two phases: a major Mn-rich phase with a cubic spinel structure and a minor NiO phase with a cubic structure. The Mn1.17-xNi0.93Co0.9ZnxO4 ceramics were highly dense, ranging from 96 to 98% of the theoretical density and were microscopically homogeneous. The addition of Zn did not cause much change in the grain size and porosity. The obtained ρ25, B25/85 constant, and activation energy of the negative temperature coefficient (NTC) Mn1.17-xNi0.93Co0.9ZnxO4 thermistors were in the range 1145-3696 Ω cm, 3218-3550 K, and 0.277-0.306 eV, respectively. This means that the electrical properties can be adjusted to desired values, depending on their Zn content. In particular, the resistivity and sensitivity were substantially enhanced with increasing Zn content.

AB - As-sintered Mn1.17-xNi0.93Co0.9ZnxO4 (0 ≤ x ≤ 0.075) bodies consisted of two phases: a major Mn-rich phase with a cubic spinel structure and a minor NiO phase with a cubic structure. The Mn1.17-xNi0.93Co0.9ZnxO4 ceramics were highly dense, ranging from 96 to 98% of the theoretical density and were microscopically homogeneous. The addition of Zn did not cause much change in the grain size and porosity. The obtained ρ25, B25/85 constant, and activation energy of the negative temperature coefficient (NTC) Mn1.17-xNi0.93Co0.9ZnxO4 thermistors were in the range 1145-3696 Ω cm, 3218-3550 K, and 0.277-0.306 eV, respectively. This means that the electrical properties can be adjusted to desired values, depending on their Zn content. In particular, the resistivity and sensitivity were substantially enhanced with increasing Zn content.

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