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Excellence in Broadband Dielectric Spectroscopy • Impedance Spectroscopy • Conductivity Spectroscopy

Alpha-A Analyzer Measurement Examples

Broadband Dielectric Spectra of PVDF

Real part of permittivity
Fig.1. Real part permittivity ε'(f,T) of PVDF over frequency and temperature in 3d representation
Imaginary part of permittivity
Fig.2. Imaginary part permittivity ε''(f,T) of PVDF over frequency and temperature in 3d representation
Real part of capacity
Fig.3. Real part capacity Cp'(f) of PVDF over frequency for several temperatures
Loss factor
Fig.4. Loss factor tan(δ)(f) of PVDF over frequency for several temperatures

The measurement results shown in Figs. 1-4 were obtained using an Alpha-ANB analyzer with ZGS active sample cell test interface and a Quatro Cryosystem system for temperature control. In order to demonstrate the overall system performance, PVDF was chosen as a material with moderate loss. Figs. 1 and 2 show the dielectric spectrum at frequencies from 1 mHz to 10 MHz at several temperatures.

PVDF shows α and β relaxations with tan(δ) in the range from 0.01 to 0.2. At higher temperatures, DC conductivity creates the typical low-frequency increase of ε'' with decreasing frequency. As shown in the three-dimensional diagrams, the data could be measured over the entire frequency and temperature ranges nearly without artefacts. In order to show the data in more detail, the diagrams for capacity and tan(δ) in Fig. 3, 4 were confined to the range of interest.