Determination of Piezoelectric and Pyroelectric Coefficients and Thermal Diffusivity of 1-3 PZT/Epoxy Composites. Y.Phermpornsakul,S.Muensit Material Physics Research Unit Department of Physics, Prince of Songkla university I.L.Guy Department of Physics Macquarie University. Abstract.
Determination of Piezoelectric and Pyroelectric Coefficients and Thermal Diffusivity of 1-3 PZT/Epoxy Composites
Material Physics Research Unit Department of Physics, Prince of Songkla university
Department of Physics Macquarie University
Q: charge, T: temperature
A: electrode area perpendicular to polar axis
Figure 1. SEM micrograph ( X 60) for 1-3 PZT/epoxy composite with ceramic volume fraction a, 0.4 ; b, 0.6,
Table 1. Ceramic and polymer parameters used in the composite fabrication
Sample’s surface (made reflective
By a moralized coating)
(mounted on a piezo-
voltage related to the displacement
of the sample surface was measured
by a SR530 Lock-in Amplifier.
sample surface, the piezoelectric
dii=dac/V V: driving voltage.
< Michelson interferometer >
Fig2. Piezoelectric responses for PZT(PKI 502)
Observed at a driving signal of 1kHz
Fig 3 Piezoelectric responses at 1kHz for 1-3 PZT/epoxy with
ceramic volume fraction. A, 0.4; b, 0.6.
-1~5kHz: avoid problems arising from heat generation
-This difference may be due to incomplete poling of PZT or to heat accumulation in epoxy
Fig 5. Typical temperature pattern upon heating and cooling the
composites with different current applied to the Peltier elements
Fig 4. Schematic diagram of the pyroelectric
converted into an equivalent voltage by mean of a linearized RTD module
Fig 6 Simulation showing the attenuation and phase
lag of the thermal waves for the composite with
ceramic volume fraction 0.4.
with appropriate boundary conditions.
Fig 7 Variations of phase lag and amplitude of the pyroelectric current measured on the composite with
ceramic volume fraction 0.4.a, phase lag ;b, amplitude
elastic compliance of the polymer is higher than that of the ceramic