Microstructure and electrical properties of 0-3 connectivity barium titanate−Portland cement composite with 40% barium titanate content

ABSTRACT

In this paper, a study is presented on the microstructure, dielectric and piezoelectric properties of 0–3 connectivity barium titanate-Portland cement composite with 40% barium titanate content at this composition has an acoustic impedance that match with concrete structure. The results show that both of dielectric constant (ϵ_r) and dielectric loss (tanδ) of composite were found to decrease with increasing frequency. The ϵ_r value of composite was 239 at a frequency of 1 kHz. In addition, the ferroelectric hysteresis loops of composite indicate that the “apparent” remnant polarization increases as an applied external electrical field increases. Furthermore, the piezoelectric coefficient was 7 pC/N under a low poling field of 1 kV/mm.

KEYWORDS:

• Ferroelectric properties
• piezoelectric properties
• barium titanate
• cement
• composite

Acknowledgments

The authors are grateful to the members of staff at the Electroceramics Research Laboratory for the research facilities made possible for this research work. The Thailand Research Fund (TRF), the Commission on Higher Education (Thailand) and Chiang Mai University are gratefully acknowledged for the financial support of this research work.