Eur. Phys. J. AP 15, 97-104 (2001)
https://doi.org/10.1051/epjap:2001171

Microwave dielectric relaxation of ferroelectric PLZT ceramics in the range of 300-900 K

¹ Département de Physique, Faculté des Sciences et Techniques, Université Hassan 1er, Settat, Morocco
² Département de Physique, Faculté des Sciences, Université Moulay Ismaïl, Meknes, Morocco
³ PIOM, ENSCPB, avenue Pey-Berland, BP 108, 33402 Talence, France
⁴ ICMCB, avenue du Dr. A. Schweitzer, 33608 Pessac, France

Corresponding author: mouhsen@ibnsina.uh1.ac.ma

Received: 8 June 2000
Revised: 26 December 2000
Accepted: 15 March 2001
Published online: 15 August 2001

Abstract

Dielectric response of PLZT(x/65/35) ceramics (with x = 0, 2, 4, 5) was studied using radio frequency and microwave techniques in the temperature range 300−900 K and with a frequency range of 10² Hz-3 × 10⁹ Hz. Dielectric relaxation appears around 1 × 10⁹ Hz at room temperature. The relaxation frequency softens at T_c and the dielectric relaxation exists in both paraelectric and ferroelectric phases and depends on x the lanthanum concentration. A model of correlation chains gives some keys for understanding the frequency behaviour of such materials.