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Physics of the Solid State - New environmental-friendly lead-free barium calcium stannate titanate (BCTS)–Portland cement (PC) composites were studied and fabricated to be compatible with the... 相似文献
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R. Rianyoi R. Potong N. Jaitanong R. Yimnirun A. Chaipanich 《Applied Physics A: Materials Science & Processing》2011,104(2):661-666
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/cm2. 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. 相似文献
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