SciELO - Scientific Electronic Library Online

vol.7 issue2Comparison of two different synthesis methods of perovskites, SrCo0.5FeO3 type, aiming at evaluating their use as membranes for partial oxidation of methaneSynthesis, characterization and determination of the metal ions adsorption capacity of cellulose modified with p-aminobenzoic groups author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand




Related links


Materials Research

Print version ISSN 1516-1439On-line version ISSN 1980-5373


GUERRA, José de los Santos  and  EIRAS, José Antonio. High frequency dielectric relaxation in lanthanum modified PbTiO3 ferroelectric ceramics. Mat. Res. [online]. 2004, vol.7, n.2, pp.325-328. ISSN 1516-1439.

Dielectric measurements of lanthanum modified lead titanate ceramics were carried out in a frequency and temperature range of 70 ´ 106Hz - 2 ´ 109Hz and 300 K - 420 K, respectively. Dielectric relaxation appears around 7 ´ 108Hz at room temperature, and the maximum of the dielectric relaxation was around 393 K, the transition temperature (Tc). The relaxation frequency passes through a minimum at Tc and the dielectric relaxation exists in both paraelectric and ferroelectric phases. A fitting of the experimental data with the Debye relations gives some keys for understanding the dielectric behavior of such materials.

Keywords : dielectric relaxation; ferroelectric ceramics; microwave dispersion.

        · text in English     · English ( pdf epdf )


Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License