Grain size effect on the structural and dielectric properties of Pb0.85La0.15TiO3 ferroelectric ceramic compound

Autor(es)

Mesquita, Alexandre ^{[1, 2, 3]} ; Basso Bernardi, Maria Ines ^[2] ; Godart, Claude ^{[1, 3]} ; Pizani, Paulo Sergio ^[4] ; Michalowicz, Alain ^{[1, 3]} ; Mastelaro, Valmor Roberto ^[2]

Afiliação do(s) autor(es)

^[1] CNRS, Inst Chim & Mat Paris Est, F-94320 Thiais - France

^[2] Univ Sao Paulo, IFSC, Sao Carlos, SP - Brazil

^[3] Univ Paris Est, F-94320 Thiais - France

^[4] Univ Fed Sao Carlos, Dept Fis, BR-13560 Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CERAMICS INTERNATIONAL; v. 38, n. 7, p. 5879-5887, SEP 2012.
• Citações Web of Science: 9
• Assunto(s): Materiais ferroelétricos Espectroscopia Raman Difração por raios X

Resumo

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. (AU)

• Processo FAPESP: 07/00011-1 - Síntese e caracterização estrutural de compostos ferroelétricos relaxores Pb1-xRxZr0,40Ti0,60O3 (R = La, BA)
• Beneficiário: Alexandre Mesquita
• Modalidade de apoio: Bolsas no Brasil - Doutorado