Effect of DC biasing field on the dielectric properties of high field treated SrTiO3 single crystals

Dielectric constant (K) and loss (Tan) of strontium titanate single crystals subjected to high electric fields (10 KV/cm, AC or DC) were measured as a function of frequency (10(2) to 10(7) Hz). These properties were also studied as a function of time at 10(3) Hz immediately after the high field treatment. The value of K and tan delta of the field-treated samples attained a steady value after 20 hours, Measurements of K and Tan delta as a function of time and frequency under small DC biasing fields (200 V/cm) were taken. The values of K and tan delta of the high held-treated samples decreased with time and frequencies; however under a DC biasing field, K increases slightly up to 10 minutes and then decreases slowly with time to a steady value. The inversion temperature (T-i) at different frequencies get reduced with high field treatment. However, the application of small DC-biasing field increased the T-i value with the increase of biasing field strength. On the other hand, activation energy increased with high field and decreased with biasing field. The effect of high DC field treatment on SrTiO3 single crystal exhibits more prominent changes in K, tan delta, T-i and activation energy than that of high AC field treated samples.