Electrical Properties and Infrared Studies of Heated Mica Sheets | ||||
| Egyptian Journal of Solids | ||||
| Article 13, Volume 25, Issue 1, 2002, Page 137-152 PDF (222.2 K) | ||||
| DOI: 10.21608/ejs.2002.150471 | ||||
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| Abstract | ||||
| Dielectric constant (έ), dielectric loss (ε") and (tan δ) have been measured for heated Mica sheets at different temperatures (200-900oC) for 2 hours in the frequency range (0.1-100KHZ). It has been found that the dielectric constant and dielectric loss are nearly stable till 600ºC but showing an increase at 800 and 900oC. The dielectric loss and tan δ show maximum 800 and 900oC. The activation energy values of dielectric relaxation have been calculated for mica sheets for the latter temperatures. It was observed that the activation energy values go on increasing with increasing heating temperature from 800ºC to 900ºC. The resistivity of mica sheets was studied also as a function of temperature in the range (30–70ºC) for the samples heated at 800ºC and 900ºC over frequency range [0.1–100 KHz]. It was found that the resistivity increases with temperature and decreases with frequency. The resistivity at 900ºC is higher than 800ºC overall the range used. Infrared spectra were studied to link the influence of the structure of heated mica with their thermal behavior. | ||||
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