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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Characterization of dense lead lanthanum titanate ceramics prepared from powders synthesized by the oxidant peroxo method

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Pinto, Alexandre H. [1] ; Souza, Flavio L. [2] ; Chiquito, Adenilson J. [3] ; Longo, Elson [4] ; Leite, Edson R. [1] ; Camargo, Emerson R. [1]
Total Authors: 6
[1] Univ Fed Sao Carlos, UFSCar, Dept Quim, LIEC Lab Interdisciplinar Eletroquim & Ceram, BR-13565905 Sao Carlos, SP - Brazil
[2] Univ Fed ABC, Ctr Ciencias Nat & Humanas, BR-09210170 Santo Andre, SP - Brazil
[3] Univ Fed Sao Carlos, UFSCar, Dept Fis, BR-13565905 Sao Carlos, SP - Brazil
[4] Univ Estadual Paulista, UNESP, Inst Quim Araraquara, BR-14801907 Araraquara, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Materials Chemistry and Physics; v. 124, n. 2-3, p. 1051-1056, DEC 1 2010.
Web of Science Citations: 7

Nanosized powders of lead lanthanum titanate (Pb(1-x)La(x)TiO(3)) were synthesized by means of the oxidant-peroxo method (OPM) Lanthanum was added from 5 to 30% in mol through the dissolution of lanthanum oxide in nitric acid followed by the addition of lead nitrate to prepare a solution of lead and lanthanum nitrates which was dripped into an aqueous solution of titanium peroxo complexes forming a reactive amorphous precipitate that could be crystallized by heat treatment Crystallized powders were characterized by FT-Raman spectroscopy and X-ray powder diffraction showing that tetragonal perovskite structure is obtained for samples up to 25% of lanthanum and cubic perovskite for samples with 30% of lanthanum Powders containing 25 and 30% in mol of lanthanum were calcined at 700 degrees C for 2 h and in order to determine the relative dielectric permittivity and the phase transition behaviour from ferroelectric-to-paraelectric ceramic pellets were prepared and sintered at 1100 or 1150 degrees C for 2 h and subjected to electrical characterization It was possible to observe that sample containing 25% in mol of La presented a normal behaviour for the phase transition whereas the sample containing 30% in mol of La presented a diffuse phase transition and relaxor behaviour (C) 2010 Elsevier B V All rights reserved (AU)