An Investigation on Anti-reducing Effect of CaO in Barium Titanate Based Ceramic

Abstract:

Anti–reducing effect of CaO in barium titanate based ceramic materials sintered at reducing atmosphere and the structure development of the materials has been studied in this paper.The results show: Addition of CaO in barium titanate based ceramic will keep resistivity of the sample sintered at reducing atmosphere at a high level. The resistivity of the materials increase with the increasing of CaO, and the resistivity keep in constant after the amount of CaO excess 3mol%. In the sample with sintering aid of SiO₂ and BaO-excess, introducing of CaO may improve the resistivity of the materials obviously. A slight new phase formation was found in the BaO-excess sample, but no new phase formation was found in the non BaO-excess sample. If there is sintering aid of SiO₂ in the sample, CaO may accelerate liquid phase film formation at the surface of grains, which will suppress the diffusion of oxygen in the grains to the environment.

• Periodical: Advanced Materials Research (Volumes 239-242)
• Pages: 2457-2460
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.239-242.2457
• Online since: May 2011
• Authors: Sen Wang, Zhi Hui Li, Xin Liu, Huan Zhang
• Keywords: Anti-Reducing, Barium Titanate (BT), Grain

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