Dielectric and Structural Characterization of Pb(1-x)A(x)Zr(0.40)Ti(0.60)O(3) (A = Sr, Ca) Ferroelectric Ceramics

Autor(es)

Mesquita, A. ^{[1, 2, 3, 4]} ; Michalowicz, A. ^{[2, 3]} ; Mastelaro, V. R. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil

^[2] CNRS, Inst Chim & Mat Paris Est, F-94320 Thiais - France

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

^[4] Univ Estadual Paulista, Dept Fis, Inst Geociencias & Ciencias Exatas, BR-13506900 Rio Claro, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Science of Advanced Materials; v. 5, n. 9, p. 1264-1270, SEP 2013.
• Citações Web of Science: 2
• Assunto(s): Materiais ferroelétricos

Resumo

This paper reports the influence of Sr- and Ca-substitution on the structural and ferroelectric properties of Pb1-xSrxZr0.40Ti0.60O3 (PSZT) and Pb1-xCaxZr0.40Ti0.60O3 (PCZT) ceramic systems. The dielectric measurements show that these substitutions cause a diffuse behavior in the dielectric permittivity curves for all samples. According to the X-ray absorption near-edge structure (XANES) spectra collected at Ti K- and L-III-edge, when Pb was replaced by Sr or Ca, a decrease in the local distortion around Ti atoms in the TiO6 octahedron could be observed. The O K-edge XANES spectra also revealed that the hybridization between O 2p and Pb 6sp states decreased as the amount of Sr or Ca atoms increased. Based on these results, it was possible to ascertain that the ferroelectric behavior in PSZT and PCZT samples bears a close correlation to the hybridization weakening between O 2p and Pb 6 sp states. (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