Aging of nickel manganite NTC ceramics

Dao-lai Fang; Cui-hong Zheng; Chusheng Chen; Aloysius J.A. Winnubst

doi:10.1007/s10832-008-9467-5

Aging of nickel manganite NTC ceramics

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

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Abstract

Effect of thermal history and chemical composition on aging of Ni x Mn3 − x O4 + δ (0.56 ≤ x ≤ 1.0) ceramics was investigated. It was found that all the Ni x Mn3 − x O4 + δ ceramic samples metallized by co-firing at 1050°C showed significant electrical stability with an aging coefficient less than 1.0%, while aging of those metallized by annealing at 850°C was increasingly serious with a rise in Ni content x, the aging coefficient ranging from 0.2% to 3.8%. However, the ceramic samples with Ni content x ≤ 0.70, whether metallized by co-firing or by annealing, exhibited extraordinarily high electrical stability with an aging coefficient less than 0.5%. The composition dependence of aging of the ceramic samples was explained qualitatively, based on the electrical conduction mechanism of small polaron hopping and on the aging mechanism of the cationic vacancy-assisted migration of cations to their thermodynamically preferable sites under thermal stress.

Original language	Undefined
Pages (from-to)	421-427
Journal	Journal of electroceramics
Volume	22
Issue number	4
DOIs	https://doi.org/10.1007/s10832-008-9467-5
Publication status	Published - 2009

Keywords

Nickel manganite - Aging - Cation vacancy - Small polaron hopping
METIS-257193
IR-71711

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10.1007/s10832-008-9467-5

Cite this

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title = "Aging of nickel manganite NTC ceramics",

abstract = "Effect of thermal history and chemical composition on aging of Ni x Mn3 − x O4 + δ (0.56 ≤ x ≤ 1.0) ceramics was investigated. It was found that all the Ni x Mn3 − x O4 + δ ceramic samples metallized by co-firing at 1050°C showed significant electrical stability with an aging coefficient less than 1.0%, while aging of those metallized by annealing at 850°C was increasingly serious with a rise in Ni content x, the aging coefficient ranging from 0.2% to 3.8%. However, the ceramic samples with Ni content x ≤ 0.70, whether metallized by co-firing or by annealing, exhibited extraordinarily high electrical stability with an aging coefficient less than 0.5%. The composition dependence of aging of the ceramic samples was explained qualitatively, based on the electrical conduction mechanism of small polaron hopping and on the aging mechanism of the cationic vacancy-assisted migration of cations to their thermodynamically preferable sites under thermal stress.",

keywords = "Nickel manganite - Aging - Cation vacancy - Small polaron hopping, METIS-257193, IR-71711",

author = "Dao-lai Fang and Cui-hong Zheng and Chusheng Chen and Winnubst, {Aloysius J.A.}",

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TY - JOUR

T1 - Aging of nickel manganite NTC ceramics

AU - Fang, Dao-lai

AU - Zheng, Cui-hong

AU - Chen, Chusheng

AU - Winnubst, Aloysius J.A.

PY - 2009

Y1 - 2009

N2 - Effect of thermal history and chemical composition on aging of Ni x Mn3 − x O4 + δ (0.56 ≤ x ≤ 1.0) ceramics was investigated. It was found that all the Ni x Mn3 − x O4 + δ ceramic samples metallized by co-firing at 1050°C showed significant electrical stability with an aging coefficient less than 1.0%, while aging of those metallized by annealing at 850°C was increasingly serious with a rise in Ni content x, the aging coefficient ranging from 0.2% to 3.8%. However, the ceramic samples with Ni content x ≤ 0.70, whether metallized by co-firing or by annealing, exhibited extraordinarily high electrical stability with an aging coefficient less than 0.5%. The composition dependence of aging of the ceramic samples was explained qualitatively, based on the electrical conduction mechanism of small polaron hopping and on the aging mechanism of the cationic vacancy-assisted migration of cations to their thermodynamically preferable sites under thermal stress.

AB - Effect of thermal history and chemical composition on aging of Ni x Mn3 − x O4 + δ (0.56 ≤ x ≤ 1.0) ceramics was investigated. It was found that all the Ni x Mn3 − x O4 + δ ceramic samples metallized by co-firing at 1050°C showed significant electrical stability with an aging coefficient less than 1.0%, while aging of those metallized by annealing at 850°C was increasingly serious with a rise in Ni content x, the aging coefficient ranging from 0.2% to 3.8%. However, the ceramic samples with Ni content x ≤ 0.70, whether metallized by co-firing or by annealing, exhibited extraordinarily high electrical stability with an aging coefficient less than 0.5%. The composition dependence of aging of the ceramic samples was explained qualitatively, based on the electrical conduction mechanism of small polaron hopping and on the aging mechanism of the cationic vacancy-assisted migration of cations to their thermodynamically preferable sites under thermal stress.

KW - Nickel manganite - Aging - Cation vacancy - Small polaron hopping

KW - METIS-257193

KW - IR-71711

U2 - 10.1007/s10832-008-9467-5

DO - 10.1007/s10832-008-9467-5

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