| Full text | |
| Author(s): |
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
|
| Affiliation: | [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 |
| Abstract | |
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) | |