Acoustic and dielectric properties of 0–3 bismuth sodium titanate-bismuth potassium titanate-barium titanate/cement composites

ABSTRACT

The lead-free piezoelectric ceramic-cement composites made from bismuth sodium titanate-bismuth potassium titanate-barium titanate (BNBK) ceramic particle and Portland cement (PC) are developed for smart structure applications. The acoustic and dielectric properties of composites were investigated. The 30–60 vol% gave the optimal BNBK content for an acoustic impedance match between 0–3 connectivity BNBK-PC composites and structure materials, i.e. concrete. Parallel, cube and series models were also compared to the dielectric measurement results and the experimental values were found to fit closest to that of the cube model. The dielectric properties of composites were also found to depend on the frequency tested.

KEYWORDS:

• Acoustic properties
• dielectric properties
• BNBK ceramic
• cement
• composite

Acknowledgments

The authors are grateful to members of staff at the Electroceramics Research Laboratory, Faculty of Science, and Chiang Mai University for the research facilities made possible for this research work. This work is supported by the division of physics, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi. The Thailand Research Fund (TRF) (MRG5980018), the Commission on Higher Education (Thailand) and Rajamangala University of Technology Thanyaburi are gratefully acknowledged for the financial support of this research work.