High Content of Niobium on the Properties of Barium Titanate Ceramics

Abstract

This study reported the effect of adding excess niobium in higher amount (up to 1.5 mol% Nb₂O₅) than that reported in any other literature. Increasing in mol% Nb₂O₅led to a formation of secondary phase. The average grain size decreased with higher Nb₂O₅addition and it also inhibited grain growth and controlled grain uniformity in the microstructure. The presence of needle-like secondary phase when added >0.3mol% Nb₂O₅aided grain growth inhibition resulting in finer matrix grain. Addition of Nb₂O₅more than 0.9 mol% in regardless of sintering time showed two dielectric peaks which could be related to secondary phase in the microstructure.

Keywords:

• Niobium
• sintering
• microstructure
• dielectric

Acknowledgments

The authors would like to thank the Department of Materials Science and Engineering, Silpakorn University and Metallurgy and Materials Science Research Institute, Chulalongkorn University for financial support.