Preparation and electrical properties of FexCu0.10Ni0.66Mn2.24¿xO4 (0 <x <0.90) NTC ceramics

Dao-lai Fang, Chusheng Chen, Aloysius J.A. Winnubst

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Abstract

In this paper, the dense FexCu0.10Ni0.66Mn2.24−xO4 (0 ≤ x ≤ 0.90) ceramics with accurate stoichiometry are prepared by the route of solid-state coordination reaction. The effect of Fe addition on the electrical properties of the ceramics has been investigated by powder X-ray diffraction (XRD), electrical measurement and thermogravimetric analysis. With Fe content x increasing from 0 to 0.45, the resistivity remains almost unchanged, whereas the thermal constant B decreases drastically. With a further increase in x from 0.45 to 0.90, both the resistivity and the thermal constant B increase. With a rise in x from 0 to 0.9, the aging coefficient drops from 19.9 to 0.6%. The remarkable improvement of the electrical stability can be attributed to the mechanism that substitution of Fe3+ for Mn2+ and Mn3+ restrains the formation of cation vacancies in spinel lattice, thus the modification of cation distribution and the consequent aging under thermal stress is greatly alleviated.
Original languageUndefined
Pages (from-to)286-291
JournalJournal of alloys and compounds
Volume454
Issue number1-2
DOIs
Publication statusPublished - 2008

Keywords

  • METIS-250429
  • IR-71883

Cite this

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title = "Preparation and electrical properties of FexCu0.10Ni0.66Mn2.24¿xO4 (0 <x <0.90) NTC ceramics",
abstract = "In this paper, the dense FexCu0.10Ni0.66Mn2.24−xO4 (0 ≤ x ≤ 0.90) ceramics with accurate stoichiometry are prepared by the route of solid-state coordination reaction. The effect of Fe addition on the electrical properties of the ceramics has been investigated by powder X-ray diffraction (XRD), electrical measurement and thermogravimetric analysis. With Fe content x increasing from 0 to 0.45, the resistivity remains almost unchanged, whereas the thermal constant B decreases drastically. With a further increase in x from 0.45 to 0.90, both the resistivity and the thermal constant B increase. With a rise in x from 0 to 0.9, the aging coefficient drops from 19.9 to 0.6{\%}. The remarkable improvement of the electrical stability can be attributed to the mechanism that substitution of Fe3+ for Mn2+ and Mn3+ restrains the formation of cation vacancies in spinel lattice, thus the modification of cation distribution and the consequent aging under thermal stress is greatly alleviated.",
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author = "Dao-lai Fang and Chusheng Chen and Winnubst, {Aloysius J.A.}",
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language = "Undefined",
volume = "454",
pages = "286--291",
journal = "Journal of alloys and compounds",
issn = "0925-8388",
publisher = "Elsevier",
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Preparation and electrical properties of FexCu0.10Ni0.66Mn2.24¿xO4 (0 <x <0.90) NTC ceramics. / Fang, Dao-lai; Chen, Chusheng; Winnubst, Aloysius J.A.

In: Journal of alloys and compounds, Vol. 454, No. 1-2, 2008, p. 286-291.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Preparation and electrical properties of FexCu0.10Ni0.66Mn2.24¿xO4 (0 <x <0.90) NTC ceramics

AU - Fang, Dao-lai

AU - Chen, Chusheng

AU - Winnubst, Aloysius J.A.

PY - 2008

Y1 - 2008

N2 - In this paper, the dense FexCu0.10Ni0.66Mn2.24−xO4 (0 ≤ x ≤ 0.90) ceramics with accurate stoichiometry are prepared by the route of solid-state coordination reaction. The effect of Fe addition on the electrical properties of the ceramics has been investigated by powder X-ray diffraction (XRD), electrical measurement and thermogravimetric analysis. With Fe content x increasing from 0 to 0.45, the resistivity remains almost unchanged, whereas the thermal constant B decreases drastically. With a further increase in x from 0.45 to 0.90, both the resistivity and the thermal constant B increase. With a rise in x from 0 to 0.9, the aging coefficient drops from 19.9 to 0.6%. The remarkable improvement of the electrical stability can be attributed to the mechanism that substitution of Fe3+ for Mn2+ and Mn3+ restrains the formation of cation vacancies in spinel lattice, thus the modification of cation distribution and the consequent aging under thermal stress is greatly alleviated.

AB - In this paper, the dense FexCu0.10Ni0.66Mn2.24−xO4 (0 ≤ x ≤ 0.90) ceramics with accurate stoichiometry are prepared by the route of solid-state coordination reaction. The effect of Fe addition on the electrical properties of the ceramics has been investigated by powder X-ray diffraction (XRD), electrical measurement and thermogravimetric analysis. With Fe content x increasing from 0 to 0.45, the resistivity remains almost unchanged, whereas the thermal constant B decreases drastically. With a further increase in x from 0.45 to 0.90, both the resistivity and the thermal constant B increase. With a rise in x from 0 to 0.9, the aging coefficient drops from 19.9 to 0.6%. The remarkable improvement of the electrical stability can be attributed to the mechanism that substitution of Fe3+ for Mn2+ and Mn3+ restrains the formation of cation vacancies in spinel lattice, thus the modification of cation distribution and the consequent aging under thermal stress is greatly alleviated.

KW - METIS-250429

KW - IR-71883

U2 - 10.1016/j.jallcom.2006.12.059

DO - 10.1016/j.jallcom.2006.12.059

M3 - Article

VL - 454

SP - 286

EP - 291

JO - Journal of alloys and compounds

JF - Journal of alloys and compounds

SN - 0925-8388

IS - 1-2

ER -