Dielectric properties and optical absorption of KTaO3single crystals and KTaO3.NaTaO mixed crystals
Year: 1970
Type: article
Abstract: The dielectric constant K, loss tan delta and conductivity sigma of single crystals of pure KTaO 3 and KTaO 3 . NaTaO 3 mixed crystals (with 2, 12 and 35% Na) were determined as a function of frequency from 10 2 to 10 7 Hz and in the temperature range 30-350 degrees C. The dielectric constant at 30 degrees C decreases with frequency in all these samples. The tan delta values are below detection level at room temperature. The larger values of K at lower frequencies are attributed to crystal defects. The dielectric constant of all these samples decreases considerably with temperature at all frequencies but at 10 2 Hz, and from around 190 degrees C, it starts increasing with temperature This inversion temperature is found to increase with frequency but decrease with Na content. Dielectric loss is found to increase with temperature but decrease with frequency. Lg sigma plotted against 1/T for these samples shows that the intrinsic conductivity region is not reached even at 350 degrees C.
Authors: M D Agrawal, K V Rao
Institution: Indian Institute of Technology Kharagpur
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W1992831997