Effect of La2O3 and CeO2 on Nb2O5 Doped TiO2 Ceramic Varistors

Jia Mi; Zi Long Tang; Shao Hua Luo; Zhong Tai Zhang

doi:10.4028/www.scientific.net/KEM.280-283.301

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 280-283Effect of La2O3 and CeO2 on Nb2O5 Doped TiO2...

Effect of La₂O₃ and CeO₂ on Nb₂O₅ Doped TiO₂ Ceramic Varistors

Abstract:

The influence of La2O3 and CeO2 on a new class of polystalline ceramics with electrical properties based on TiO2 was investigated. The content of added La and Ce is in 1 at%, while that of the other addition is always maintained at a constant value. The disks were sintered at 13800C for 4 hours. La2O3 was found to precipitate at the grain boundaries, probably inducing electronic interface states that can trap charges at the TiO2-TiO2 interface and lead to significantly increase the nonlinear behavior. The values for α (» 4.2) and V1mA(» 26 V) support that finding. It was found CeO2 that as a dopant did not strongly influence the nonlinear values of the systems as did La2O3, indicating that it could have formed a solid-state solution with TiO2 in the grains, but did not segregate sufficiently at the grain boundaries. In present work, impedance analyzer, X-ray spectrometer, and scanning electron microscope (SEM) were used.

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Key Engineering Materials (Volumes 280-283)

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301-304

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https://doi.org/10.4028/www.scientific.net/KEM.280-283.301

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February 2007

Authors:

Jia Mi, Zi Long Tang, Shao Hua Luo, Zhong Tai Zhang

Keywords:

Nonlinear Property, Titania (TiO₂), Varistors

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