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Artigo Científico | Materiais Semicondutores e Ferroelétricos | Inglês | 10/04/2004
Autores: J.A. Eiras, José de los Santos Guerra
Palavras-chave: dielectric relaxation, ferroelectric ceramics, microwave dispersion
Resumo: 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.
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