Structural and dielectric characterization of praseodymium-modified lead titanate ceramics synthesized by the OPM route

Autor(es)

Pinto, Alexandre H. ^[1] ; Souza, Flavio L. ^[2] ; Longo, Elson ^[3] ; Leite, Edson R. ^[1] ; Camargo, Emerson R. ^[1]

Afiliação do(s) autor(es)

^[1] UFSCar Fed Univ Sao Carlos, Dept Chem, LIEC Lab Interdisciplinar Eletroquim & Cerem, BR-13565905 Sao Carlos, SP - Brazil

^[2] UFABC Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210170 Santo Andre, SP - Brazil

^[3] UNESP Sao Paulo State Univ, Chem Inst Araraquara, Dept Biochem, BR-14801907 Araraquara, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Materials Chemistry and Physics; v. 130, n. 1-2, p. 259-263, OCT 17 2011.
• Citações Web of Science: 4

Resumo

Quasi-spherical nanoparticles of praseodymium-modified lead titanate powder (Pb(0.80)Pr(0.20)TiO(3)) with an average size of 54.8 nm were synthesized successfully by the oxidant-peroxo method (OPM) and were used to prepare highly dense ceramic bodies which were sintered at 1100 and 1150 degrees C for 2 h. A tetragonal phase was identified in the powder and ceramic samples by X-ray powder diffraction and FT-Raman spectroscopy at room temperature. The fractured surface of the ceramic sample showed a high degree of densification with fairly uniform grain sizes. Dielectric constants measured in the range of 30-300 degrees C at different frequencies (120 Hz and at 1,10 and 100 kHz) indicated that samples with 20 mol% praseodymium showed normal ferroelectric behavior regardless of the sintering temperature. (C) 2011 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 07/50904-2 - Perovskitas baseadas no titanato de chumbo modificadas com terras raras sintetizadas usando o método dos complexos oxidantes de peróxido (OPM - the oxidant-peroxide method) e caracterizadas com uso complementar de espectroscopia Raman, infravermelho e difração de raios X
• Beneficiário: Alexandre Henrique Pinto
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 07/58891-7 - Perovskitas baseadas no titanato de chumbo modificadas com terras raras sintetizadas usando o método dos complexos oxidantes de peróxido (OPM - the oxidant-peroxide method) e caracterizadas com uso complementar de espectroscopia Raman, difração de raios-X e microscopia eletrônica
• Beneficiário: Emerson Rodrigues de Camargo
• Modalidade de apoio: Auxílio à Pesquisa - Regular