Artículos de revistas
Grain size effect on the structural and dielectric properties of Pb0.85La0.15TiO3 ferroelectric ceramic compound
Fecha
2012Registro en:
CERAMICS INTERNATIONAL, OXFORD, v. 38, n. 7, supl. 4, Part 1-2, pp. 5879-5887, SEP, 2012
0272-8842
10.1016/j.ceramint.2012.04.039
Autor
Mesquita, Alexandre
Basso Bernardi, Maria Ines
Godart, Claude
Pizani, Paulo Sergio
Michalowicz, Alain
Mastelaro, Valmor Roberto
Institución
Resumen
This paper presents a study of the influence of particle size on the structural and dielectric properties of Pb0.85La0.15TiO3 (PLT15) ferroelectric ceramic samples. The samples were prepared with average grain size of 1.69 +/- 0.08 mu m and 146 +/- 8 nm using, respectively, conventional and spark plasma sintering techniques. A decrease in the tetragonality degree as the crystallite size decreased was explained by an internal stress caused by the existence of a large amount of grain boundaries. The local structure exhibited no significant modification and the dielectric measurements showed a diffuse phase transition and a reduction in the permittivity magnitude at T-m as the average grain size decreased. The nanostructured ceramic sample prepared at a relatively lower temperature and sintering time presented a dielectric constant value of approximately 2000 at room temperature. (c) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.