Time-Domain Dielectric Spectrometer


By using a time domain method, this spectrometer allows to extend the dynamic range down to equivalent frequencies as low as 1e-6 Hz maintaining both a broad temperature range and a high accuracy. Moreover, it allows to investigate in detail time dependent effects on the dielectric relaxation. (see an example below)

INSTRUMENT CHARACTERISTICS

The dielectric sample response is obtained by measuring the subsequent depolarization current of a sample capacitor to which a pulse shape voltage has been previously applied (transient current experiment). By means of this technique one can access to relaxation times as high as 1e6 s.

Electrometer: Keithley 6517A

  • Response time: ~0.1 s

  • Sensitivity better than ~1e-16 A

  • Voltage range: �1000 V

  • Intensity: 0 -20 mA

Temperature Control: Nitrogen-jet stream Quatro Cryosystem Novocontrol

  • Temperature range: 100 - 600 K

  • Temperature stability better than  ± 0.01 K


Samples: Solids (typically a film) and Liquids

  • A parallel plate capacitor of about 20 mm diameter and 0.1 mm thickness, formed with the sample by using two gold-plated electrodes, is located inside the cryofurnace.

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Contact |Where we are | Last updated December 2017