Phase transition study in PLZT ferroelectric ceramics by mechanical and dielectric spectroscopies

被引：17
|
作者：
Silva, P. S., Jr. [1 ]
Florencio, O. [1 ]
Botero, E. R. [2 ]
Eiras, J. A. [2 ]
Garcia, D. [2 ]
机构：
[1] Univ Fed Sao Carlos, Dept Phys, Mech Spect Grp, Sao Carlos, SP, Brazil
[2] Univ Fed Sao Carlos, Dept Phys, Ferroelect Ceram Grp, Sao Carlos, SP, Brazil
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2009年 / 521-22卷
基金：
巴西圣保罗研究基金会;
关键词：
Anelastic spectroscopy; Dielectric spectroscopy; PLZT; Ferroelectric ceramics; GLASSY POLARIZATION BEHAVIOR; RELAXOR FERROELECTRICS; RELAXATION; TITANATE; STRAIN;
D O I：
10.1016/j.msea.2008.09.089
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Measurements of anelastic and dielectric spectroscopies have been conducted in (Pb/La)(Zr/Ti)O-3 (PLZT) ferroelectric ceramics, with Zr/Ti = 65/35 and with La = 5 at.% and 8 at.% Both the anelastic and the dielectric results have shown the presence of ferroelectric-paraelectric phase transitions around 250 degrees C for PLZT 5/65/35 and around 150 degrees C for PUT 8/65/35, where the shift of the maximum elastic (electric) susceptibility for low temperatures with increase of lanthanum amount can be observed. The behavior of the relative variation of the elastic moduli as a function of the temperature was compared to the Landau-Devonshire theory of phase transitions. These results revealed the change of the kind of coupling between strain and order parameter in the ferroelectric-paraelectric phase transition with the increase of lanthanum concentration. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码：224 / 227
页数：4
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