Influence of Sintering Time on the PTCR Effect of Nb2O5-doped BaTiO3 Ceramics

Influence of Sintering Time on the PTCR Effect of Nb2O5-doped BaTiO3 Ceramics

The effects of the sintering time on the electrical properties and the positive temperature coefficient of resistance (PTCR) effect of Ba1.006(Ti1-xNbx)O3 (BTN) ceramics were investigated, which were sintered at 1190 ºC for 0.5-6 hours in a reducing atmosphere and then re-oxidized at 800 ºC for 1 ho...

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Bibliographic Details
Main Authors: Xuxin Cheng, Haining Cui, Zhiyong Xu, Xiaoming Chen, Yuxin Wang
Format: Article
Language:English
Published: Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) 2019-09-01
Series:Materials Research
Subjects:
BaTiO3
PTC effect
Nb2O5-dopant
Reoxidation
Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392019000800216&tlng=en
Description
Summary:The effects of the sintering time on the electrical properties and the positive temperature coefficient of resistance (PTCR) effect of Ba1.006(Ti1-xNbx)O3 (BTN) ceramics were investigated, which were sintered at 1190 ºC for 0.5-6 hours in a reducing atmosphere and then re-oxidized at 800 ºC for 1 hour. The results indicated that the sintering time affected the electrical properties and the PTCR effect of the multilayer BTN samples, whose room-temperature resistance decreased with an increase of the sintering time at same sintering temperature of 1190 ºC. However, the resistance jump first increased and then reduced as a function of the sintering time. Furthermore, The BTN ceramics exhibited a pronounced PTCR effect, with a resistance jump greater by 3.6 orders of magnitude, along with a low RT resistance of 0.14 Ω at a reoxidated temperature of 800 ºC after sintering at 1190 ºC for 2 h in a reducing atmosphere. In addition, the activation energy of samples obtained at different sintering times had also been investigated.
ISSN:1516-1439

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