Effect of NiO Doping Order on Properties of 10NiO-NiFe₂O₄ Composite Ceramics

Abstract:

The 10NiO-NiFe₂O₄ composite ceramics doped with NiO were prepared with the cold isostatic pressing-sintering process. The effects of NiO doping order on the density, bending strength and electrical conductivity of NiFe₂O₄ composite ceramics were studied. The results show that, doping excess 10wt% NiO before synthesis of NiFe₂O₄ composite (doping order one) and doping excess 10wt% NiO after synthesis of NiFe₂O₄ composite (doping order two), the former’s samples have a better relative density 88.9% and linear shrinkage rate 9.82%, which is increased by 7.12% and 3.6% compared with that of latter’s samples, respectively. At the same time, the former’s samples also have a better electric conductivity and reach 1.29S/cm at 1233K, which is higher about 13.15% than those latter’s samples. However, the bending strength of the former’s samples just has 76.28Mpa, which is lower about 15.41% than that of the latter’s samples 88.04Mpa.

• Periodical: Advanced Materials Research (Volume 1053)
• Pages: 109-114
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1053.109
• Online since: October 2014
• Authors: Han Bing He*
• Keywords: 10NiO-NiFe₂O₄ Composite Ceramics, Bending Strength, Electric Conductivity, NiO Doping Order, Relative Density

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