Effect of La-ions on Debye′s Relaxation Time and Activation Energy of (Pb1-1.5xLax)TiO3 Ceramics | ||||
| Egyptian Journal of Solids | ||||
| Article 13, Volume 29, Issue 2, 2006, Page 371-382 PDF (376.38 K) | ||||
| DOI: 10.21608/ejs.2006.149289 | ||||
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| Abstract | ||||
| The present paper is essentially a study of the influence La –ions on Debye′s relaxation time and consequently the activation energy in (Pb1-1.5x Lax 0.5x) TiO3 ceramics. The dielectric measurements have been carried out under electric field of frequencies equal to 1 and 100 KHz. The results which were calculated by Debye′s equation for the ferroelectric materials revealed that the sample with x= 20 mole % La characterizes with highest value of the critical relaxation time. The interpretation of the anomaly peak of dielectric constant of the sample with x= 20 mole % La was attributed to the increasing the volume of the domain. Curie-Weiss constant (C) and activation energy as a function of La- content have been determined. The calculated activation energy for the samples was found to be dependent on three parameters: La–ions, phase transition temperature and quality of ceramics which, in turn, is a function of Curie-Weiss constants. | ||||
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