Aging of nickel manganite NTC ceramics

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Fang, Dao-lai and Zheng, Cui-hong and Chen, Chu-sheng and Winnubst, A.J.A. (2009) Aging of nickel manganite NTC ceramics. Journal of Electroceramics, 22 (4). pp. 421-427. ISSN 1385-3449

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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.
Item Type:Article
Copyright:© 2009 Springer
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Science and Technology (TNW)
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Link to this item:http://purl.utwente.nl/publications/71711
Official URL:http://dx.doi.org/10.1007/s10832-008-9467-5
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