Dielectric, ferroelectric and piezoelectric properties of 0-3 barium titanate–Portland cement composites

• Published in: Applied physics. A, Materials science & processing Materials science & processing, 2011-08, Vol.104 (2), p.661-666
• Main Authors: Rianyoi, R., Potong, R., Jaitanong, N., Yimnirun, R., Chaipanich, A.
• Format: Article
• Language: English
• Subjects: Barium titanates; Cements; Characterization and Evaluation of Materials; Condensed Matter Physics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Dielectric constant; Dielectric loss; Dielectric loss and relaxation; Dielectric properties of solids and liquids; Dielectrics, piezoelectrics, and ferroelectrics and their properties; Domain structure; hysteresis; Exact sciences and technology; Ferroelectric materials; Ferroelectricity; Ferroelectricity and antiferroelectricity; Machines; Manufacturing; Mathematical models; Nanotechnology; Optical and Electronic Materials; Permittivity (dielectric function); Physics; Physics and Astronomy; Piezoelectricity; Piezoelectricity and electromechanical effects; Processes; Surfaces and Interfaces; Thin Films
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-011-6307-2

In this work, barium titanate (BT) and cement composites of 0-3 connectivity were produced with BT concentrations of 30%, 50% and 70% by volume using the mixing and pressing method. The dielectric constant ( ε r ) and the dielectric loss (tan  δ ) at room temperature and at various frequencies (0.1–20 kHz) of the ferroelectric BT-Portland cement composites with different BT concentrations were investigated. The results show that the dielectric constant of BT-PC composites was found to increase as BT concentration increases, and that the highest value for ε r —of 436—was obtained for a BT concentration of 70%. In addition, the dielectric loss tangent decreased with increasing BT concentration. Moreover, several mathematical models were used; the experimental values of the dielectric constants are closest to those calculated from the cube model. The 0-3 cement-based piezoelectric composites show typical ferroelectric hysteresis loops at room temperature. The instantaneous remnant polarization ( P ir ), at an applied external electrical field ( E 0 ) of 20 kV/cm (90 Hz) of 70% barium titanate composite, was found to have a value ≈3.42 μC/cm 2 . Furthermore, the piezoelectric coefficient ( d 33 ) was also found to increase as BT concentration increases, as expected. The highest value for d 33 was 16 pC/N for 70% BT composite.