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Issue Eur. Phys. J. Appl. Phys.
Volume 15, Number 2, August 2001
Page(s) 97 - 104
Section Characterization of Materials
DOI 10.1051/epjap:2001171

DOI: 10.1051/epjap:2001171

Eur. Phys. J. AP 15, 97-104 (2001)

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

A. Mouhsen1, 2, M.E. Achour2, J.L. Miane3 and J. Ravez4

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

mouhsen@ibnsina.uh1.ac.ma

(Received: 8 June 2000 / Revised: 26 December 2000 / Accepted: 15 March 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- $3\times 10^9$ Hz. Dielectric relaxation appears around $1\times 10^9$ Hz at room temperature. The relaxation frequency softens at $T_{\rm c}$ 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.

PACS
77.84.Dy - Niobates, titanates, tantalates, PZT ceramics, etc..
77.22.Gm - Dielectric loss and relaxation.
41.20.Jb - Electromagnetic wave propagation; radiowave propagation.


© EDP Sciences 2001


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